High Energy Physics - Theory
New submissions
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New submissions for Tue, 2 Dec 08
- [1] arXiv:0812.0005 [ps, pdf, other]
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Title: Stationary Measure in the MultiverseComments: 12 pagesSubjects: High Energy Physics - Theory (hep-th)
We study the recently proposed "stationary measure" in the context of the string landscape scenario. We show that it suffers neither from the "Boltzmann brain" problem nor from the "youngness" paradox that makes some other measures predict a high CMB temperature at present. We also demonstrate a satisfactory performance of this measure in predicting the results of local experiments, such as proton decay.
- [2] arXiv:0812.0008 [ps, pdf, other]
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Title: On the Yang-Mills two-loop effective action with wordline methodsComments: 8 pages, 4 figuresSubjects: High Energy Physics - Theory (hep-th)
We derive the two-loop effective action for covariantly constant field strength of pure Yang-Mills theory in the presence of an infrared scale. The computation is done in the framework of the worldline formalism, based on a generalization procedure of constructing multiloop effective actions in terms of the bosonic worldline path integral. The two-loop beta-function is correctly reproduced. This is the first derivation in the worldline formulation, and serves as a nontrivial check on the consistency of the multiloop generalization procedure in the worldline formalism.
- [3] arXiv:0812.0050 [ps, pdf, other]
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Title: Intersecting AttractorsComments: 1+41 pages, 2 TablesSubjects: High Energy Physics - Theory (hep-th)
We apply the entropy formalism to the study of the near-horizon geometry of extremal black p-brane intersections in D>5 dimensional supergravities. The scalar flow towards the horizon is described in terms an effective potential given by the superposition of the kinetic energies of all the forms under which the brane is charged. At the horizon active scalars get fixed to the minima of the effective potential and the entropy function is given in terms of U-duality invariants built entirely out of the black p-brane charges. The resulting entropy function reproduces the central charges of the dual boundary CFT and gives rise to a Bekenstein-Hawking like area law. The results are illustrated in the case of black holes and black string intersections in D=6, 7, 8 supergravities where the effective potentials, attractor equations, moduli spaces and entropy/central charges are worked out in full detail.
- [4] arXiv:0812.0068 [ps, pdf, other]
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Title: Centrifugal deformations of the gravitational kinkComments: 8 pages, no figuresSubjects: High Energy Physics - Theory (hep-th)
The Kaluza-Klein reduction of 4d conformally flat spacetimes is reconsidered. The corresponding 3d equations are shown to be equivalent to 2d gravitational kink equations augmented by a centrifugal term. For space-like gauge fields and non-trivial values of the centrifugal term the gravitational kink solutions describe a spacetime that is divided in two disconnected regions.
- [5] arXiv:0812.0078 [ps, pdf, other]
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Title: Plane Gravitational Radiation from Neutrinos Source with Kalb-Ramond CouplingComments: Presented at 7th Alexander Friedmann International Seminar on Gravitation and Cosmology, Joao Pessoa, Brazil, 29-05 Jul 2008Subjects: High Energy Physics - Theory (hep-th)
In this work, we propose a model based on a non-minimal coupling of neutrinos to a Kalb-Ramond field. The latter is taken as a possible source for gravitational radiation. As an immediate illustration of this system, we have studied the case where gravitational (plane) wave solutions behave as damped harmonic oscillators.
- [6] arXiv:0812.0097 [ps, pdf, other]
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Title: Fano hypersurfaces and Calabi-Yau supermanifoldsComments: 24 pages, uses JHEP3.clsSubjects: High Energy Physics - Theory (hep-th)
In this paper, we study the geometrical interpretations associated with Sethi's proposed general correspondence between N = 2 Landau-Ginzburg orbifolds with integral \hat{c} and N = 2 nonlinear sigma models. We focus on the supervarieties associated with \hat{c} = 3 Gepner models. In the process, we test a conjecture regarding the superdimension of the singular locus of these supervarieties. The supervarieties are defined by a hypersurface \widetilde{W} = 0 in a weighted superprojective space and have vanishing super-first Chern class. Here, \widetilde{W} is the modified superpotential obtained by adding as necessary to the Gepner superpotential a boson mass term and/or fermion bilinears so that the superdimension of the supervariety is equal to \hat{c}. When Sethi's proposal calls for adding fermion bilinears, setting the bosonic part of \widetilde{W} (denoted by \widetilde{W}_{bos}) equal to zero defines a Fano hypersurface embedded in a weighted projective space. In this case, if the Newton polytope of \widetilde{W}_{bos} admits a nef partition, then the Landau-Ginzburg orbifold can be given a geometrical interpretation as a nonlinear sigma model on a complete intersection Calabi-Yau manifold. The complete intersection Calabi-Yau manifold should be equivalent to the Calabi-Yau supermanifold prescribed by Sethi's proposal.
- [7] arXiv:0812.0132 [ps, pdf, other]
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Title: On-shell consistency of the Rarita-Schwinger field formulationComments: 9 pages, 1 figureSubjects: High Energy Physics - Theory (hep-th)
We prove that any bilinear coupling of a massive spin-3/2 field can be brought into a gauge invariant form suggested by Pascalutsa by means of a non-linear field redefinition. The corresponding field transformation is given explicitly in a closed form and the implications for chiral effective field theory with explicit Delta (1232) isobar degrees of freedom are discussed.
- [8] arXiv:0812.0152 [ps, pdf, other]
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Title: Duality in linearized gravity and holographyAuthors: Ioannis BakasComments: 22 pagesSubjects: High Energy Physics - Theory (hep-th)
We consider spherical gravitational perturbations of AdS4 space-time satisfying general boundary conditions at spatial infinity. Using the holographic renormalization method, we compute the energy-momentum tensor and show that it can always be cast in the form of Cotton tensor for a dual boundary metric. In particular, axial and polar perturbations obeying the same boundary conditions for the effective Schrodinger wave-functions exhibit an energy-momentum/Cotton tensor duality at conformal infinity. We demonstrate explicitly that this is holographic manifestation of the electric/magnetic duality of linearized gravity in the bulk, which simply exchanges axial with polar perturbations of AdS4 space-time. We note on the side that this particular realization of gravitational duality is also valid for perturbations near flat and dS4 space-time, depending on the value of cosmological constant.
- [9] arXiv:0812.0161 [ps, pdf, other]
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Title: Dual descriptions of spin two massive particles in $D=2+1$Comments: 13 pages, no figuresSubjects: High Energy Physics - Theory (hep-th)
In the first part of this work we show the decoupling (up to contact terms) of redundant degrees of freedom which appear in the covariant description of spin two massive particles in $D=2+1$. We make use of a master action which interpolates, without solving any constraints, between a first, second and third order (in derivatives) self-dual model. An explicit dual map between those models is derived. In our approach the absence of ghosts in the third order self-dual model, which corresponds to a quadratic truncation of topologically massive gravity, is due to the triviality (no particle content) of the Einstein-Hilbert action in $D=2+1$. In the second part of the work, also in $D=2+1$, we prove the quantum equivalence of the gauge invariant sector of a couple of self-dual models of opposite helicities (+2 and -2) and a generalized self-dual model. Such model contains a quadratic Einstein-Hilbert action, a Chern-Simons term of first order and a Fierz-Pauli mass term. The use of a first order Chern-Simons term instead of a third order one avoids conflicts with the sign of the Einstein-Hilbert action.
- [10] arXiv:0812.0165 [ps, pdf, other]
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Title: The Uncanny Precision of the Spectral ActionComments: 33 pages, 1 figureSubjects: High Energy Physics - Theory (hep-th)
Noncommutative geometry has been slowly emerging as a new paradigm of geometry which starts from quantum mechanics. One of its key features is that the new geometry is spectral in agreement with the physical way of measuring distances. In this paper we present a detailed introduction with an overview on the study of the quantum nature of space-time using the tools of noncommutative geometry. In particular we examine the suitability of using the spectral action as action functional for the theory. To demonstrate how the spectral action encodes the dynamics of gravity we examine the accuracy of the approximation of the spectral action by its asymptotic expansion in the case of the round three sphere. We find that the two terms corresponding to the cosmological constant and the scalar curvature term already give the full result with remarkable accuracy. This is then applied to the physically relevant case of the product of the three sphere by a circle where we show that the spectral action in this case is also given, for any test function, by the sum of two terms up to an astronomically small correction, and in particular all higher order terms vanish. This result is confirmed by evaluating the spectral action using the heat kernel expansion where we check that the higher order terms a4 and a6 both vanish due to remarkable cancelations. We also show that the Higgs potential appears as an exact perturbation when the test function used is a smooth cutoff function.
- [11] arXiv:0812.0166 [ps, pdf, other]
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Title: 1/N Effects in Non-Relativistic Gauge-Gravity DualityComments: 26 pages, latexSubjects: High Energy Physics - Theory (hep-th)
We argue that higher-curvature terms in the gravitational Lagrangian lead, via non-relativistic gauge-gravity duality, to finite renormalization of the dynamical exponent of the dual conformal field theory. Our argument includes a proof of the non-renormalization of the Schrodinger and Lifshitz metrics beyond rescalings of their parameters, directly generalizing the AdS case. We use this effect to construct string-theory duals of non-relativistic critical systems with non-integer dynamical exponents, then use these duals to predict the viscosity/entropy ratios of these systems. The predicted values weakly violate the KSS bound.
- [12] arXiv:0812.0175 [ps, pdf, other]
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Title: New F-theory liftsAuthors: Andres CollinucciComments: 10 pages, 3 tablesSubjects: High Energy Physics - Theory (hep-th)
In this note, a procedure is developed to explicitly construct non-trivial F-theory lifts of perturbative IIB models on toric Calabi-Yau orientifolds. This procedure works on Calabi-Yau orientifolds where the involution coordinate can have arbitrary projective weight, as opposed to the well-known cases where it has half the weight of the hypersurface equation defining the CY threefold. This opens up the possibility of lifting more general setups, such as models that have O3-planes.
- [13] arXiv:0812.0176 [pdf, other]
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Title: PT Symmetry and QCD: Finite Temperature and DensityComments: 13 pages and 10 figures; invited talk at PHHQP VII, Benasque 2008Subjects: High Energy Physics - Theory (hep-th)
The relevance of PT symmetry to Quantum Chromodynamics (QCD), the gauge theory of the strong interactions, is explored in the context of finite temperature and density. Two significant problems in QCD are studied: the sign problem of finite-density QCD, and the problem of confinement. It is proven that the effective action for heavy quarks at finite density is PT-symmetric. For the case of 1+1 dimensions, the PT-symmetric Hamiltonian, although not Hermitian, has real eigenvalues for a range of values of the chemical potential, solving the sign problem for this model. The effective action for heavy quarks is part of a potentially large class of generalized sine-Gordon models which are non-Hermitian but are PT- symmetric. Generalized sine-Gordon models also occur naturally in gauge theories in which magnetic monopoles lead to confinement. We explore gauge theories where monopoles cause confinement at arbitrarily high temperatures. Several different classes of monopole gases exist, with each class leading to different string tension scaling laws. For one class of monopole gas models, the PT-symmetric affine Toda field theory emerges naturally as the effective theory. This in turn leads to sine-law scaling for string tensions, a behavior consistent with lattice simulations.
- [14] arXiv:0812.0183 [ps, pdf, other]
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Title: From Quarks to StringsAuthors: A. M. PolyakovComments: 10 pagesSubjects: High Energy Physics - Theory (hep-th)
In this article, prepared for the book "The birth of string theory", I recall the sequence of ideas which led to non-critical strings and gauge/strings duality. I also comment on some promising future directions.
- [15] arXiv:0812.0185 [ps, pdf, other]
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Title: Infinite statistics, symmetry breaking and combinatorial hierarchyAuthors: V.ShevchenkoComments: LaTeX, 11 pagesSubjects: High Energy Physics - Theory (hep-th)
The physics of symmetry breaking in theories with strongly interacting quanta obeying infinite (quantum Boltzmann) statistics known as quons is discussed. The picture of Bose/Fermi particles as low energy excitations over nontrivial quon condensate is advocated. Using induced gravity arguments it is demonstrated that the Planck mass in such low energy effective theory can be factorially (in number of degrees of freedom) larger than its true ultraviolet cutoff. Thus, the assumption that statistics of relevant high energy excitations is neither Bose nor Fermi but infinite can remove the hierarchy problem without necessity to introduce any artificially large numbers. Quantum mechanical model illustrating this scenario is presented.
- [16] arXiv:0812.0188 [ps, pdf, other]
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Title: On quantum integrability of the Landau-Lifshitz modelComments: 17 pagesSubjects: High Energy Physics - Theory (hep-th)
We investigate the quantum integrability of the Landau-Lifshitz model and solve the long-standing problem of finding the local quantum Hamiltonian for the arbitrary n-particle sector. The particular difficulty of the LL model quantization, which arises due to the ill-defined operator product, is dealt with by simultaneously regularizing the operator product, and constructing the self-adjoint extensions of a very particular structure. The diagonalizibility difficulties of the Hamiltonian of the LL model, due to the highly singular nature of the quantum-mechanical Hamiltonian, are also resolved in our method for the arbitrary n-particle sector. We explicitly demonstrate the consistency of our construction with the quantum inverse scattering method due to Sklyanin, and give a prescription to systematically construct the general solution, which explains and generalizes the puzzling results of Sklyanin for the particular two-particle sector case. Moreover, we demonstrate the S-matrix factorization and show that it is a consequence of the discontinuity conditions on the functions involved in the construction of the self-adjoint extensions.
- [17] arXiv:0812.0227 [ps, pdf, other]
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Title: A comment on $p$-branes of ($p+3$)$\rm{d}$ string theorySubjects: High Energy Physics - Theory (hep-th)
We argue that natural background $p$-brane of ($p+3$)d string theory is NS-brane rather than D-brane, which leads us, in the context of brane world scenarios, to a conjecture that the true natural $p$-brane describing our universe would be a bound state of D-branes (SM-brane) and background NS-branes, rather than a single stack of D-branes alone. We also argue that the usual codimension-2 brane solutions with geometry $R_2$ or $R_2 /Z_n$ on the transverse dimensions already contain the negative tension NS-brane implicitly in their ansatz.
- [18] arXiv:0812.0228 [ps, pdf, other]
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Title: Gauge Orbit Types for Theories with Classical Compact Gauge GroupComments: 57 pagesSubjects: High Energy Physics - Theory (hep-th)
We determine the orbit types of the action of the group of local gauge transformations on the space of connections in a principal bundle with structure group O(n), SO(n) or $Sp(n)$ over a closed, simply connected manifold of dimension 4. Complemented with earlier results on U(n) and SU(n) this completes the classification of the orbit types for all classical compact gauge groups over such space-time manifolds. On the way we derive the classification of principal bundles with structure group SO(n) over these manifolds and the Howe subgroups of SO(n).
- [19] arXiv:0812.0248 [ps, pdf, other]
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Title: Gauge Coupling Unification in F-theory GUT ModelsAuthors: Ralph BlumenhagenComments: 4 pages, 3 figuresSubjects: High Energy Physics - Theory (hep-th)
We investigate gauge coupling unification for F-theory respectively Type IIB orientifold constructions of SU(5) GUT theories with gauge symmetry breaking via non-trivial hypercharge flux. This flux has the non-trivial effect that it splits the values of the three MSSM gauge couplings at the string scale, thus spoiling the celebrated one-loop gauge coupling unification. It is shown how F-theory evades this problem in a natural way.
- [20] arXiv:0812.0257 [ps, pdf, other]
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Title: Superembedding approach to superstring in AdS(5)xS*5 superspaceAuthors: Igor A. BandosComments: 31 pages, LaTeX, World Scientific style, Contribution to the Wolfgang Kummer Memorial VolumeSubjects: High Energy Physics - Theory (hep-th)
We review the spinor moving frame formulations and generalized action principle for super-p-branes, describe in detail the superembedding approach to superstring in general type IIB supergravity background and present the complete superembedding description of type IIB superstring in the AdS(5)xS*5 superspace.
- [21] arXiv:0812.0260 [ps, pdf, other]
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Title: Classical fields method for a relativistic interacting Bose gasComments: 12 pages, 10 figuresSubjects: High Energy Physics - Theory (hep-th)
We formulate a classical fields method for description of relativistic interacting bosonic particles at nonzero temperatures. The method relays on the assumption that at low temperatures the Bose field can be described by a c-number function. We discuss a very important role of the cut-off momentum which divides the field into dominant classical part and a small quantum correction. We illustrate the method by studying a thermodynamics of relativistic Bose field which dynamics is governed by the Klein-Gordon equation with $\lambda \psi^4$ term responsible for interactions.
- [22] arXiv:0812.0351 [pdf, other]
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Title: The Trace Anomaly and Massless Scalar Degrees of Freedom in GravityComments: 60 pages, 11 Figures (pdf)Subjects: High Energy Physics - Theory (hep-th)
The trace anomaly of quantum fields in electromagnetic or gravitational backgrounds implies the existence of massless scalar poles in physical amplitudes involving the stress-energy tensor. Considering first the axial anomaly and using QED as an example, we compute the full one-loop triangle amplitude of the fermionic stress tensor with two current vertices, <T^{mn} J^a J^b>, and exhibit the scalar pole in this amplitude associated with the trace anomaly, in the limit of zero electron mass m -> 0. To emphasize the infrared aspect of the anomaly, we use a dispersive approach and show that this amplitude and the existence of the massless scalar pole is determined completely by its ultraviolet finite terms, together with the requirements of Poincare invariance of the vacuum, Bose symmetry under interchange of J^a and J^b, and vector current and stress tensor conservation. We derive a sum rule for the appropriate positive spectral function corresponding to the discontinuity of the triangle amplitude, showing that it becomes proportional to delta function of k^2, and therefore contains a massless scalar intermediate state in the conformal limit of zero electron mass. The effective action corresponding to the trace of the triangle amplitude can be expressed in local form by the introduction of two scalar auxiliary fields which satisfy massless wave equations. These massless scalar degrees of freedom couple to classical sources, contribute to gravitational scattering processes, and can have long range gravitational effects.
- [23] arXiv:0812.0354 [ps, pdf, other]
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Title: The Kalb-Ramond Odderon in AdS/CFTComments: 65 pages, 6 figuresSubjects: High Energy Physics - Theory (hep-th)
At high energies, elastic hadronic cross sections, such as $pp, \bar p p, \pi^{\pm} p$, are dominated by vacuum exchange, which in leading order of the $1/N_c$ expansion has been identified as the BFKL Pomeron or its strong AdS dual the closed string Reggeized graviton \cite{Brower:2006ea}. However the difference of particle anti-particle cross sections are given by a so-called Odderon, carrying C = -1 vacuum quantum numbers identified in weak coupling with odd numbers of exchanged gluons. Here we show that in the dual description the Odderon is the Reggeized Kalb-Ramond field ($B_{\mu\nu}$) in the Neveu-Schwartz sector of closed string theory. To first order in strong coupling, the high energy contribution of Odderon is evaluated for ${\cal N} = 4$ Super Yang-Mills by a generalization of the gravity dual analysis for Pomeron in Ref. \cite{Brower:2006ea}. The consequence of confinement on the Odderon are estimated in the confining QCD-like $AdS^5$ hardwall model of Polchinski and Strassler \cite{Polchinski:2001tt}.
Cross-lists for Tue, 2 Dec 08
- [24] arXiv:0811.3050 (cross-list from hep-ph) [ps, pdf, other]
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Title: Gauge Covariance Relations and the Fermion Propagator in Maxwell-Chern-Simons QED3Comments: 13 pages, 4 figures. Published version. V2, References correctedJournal-ref: J. Phys. A: Math. Theor. 41 (2008) 505401Subjects: High Energy Physics - Phenomenology (hep-ph); Mesoscopic Systems and Quantum Hall Effect (cond-mat.mes-hall); High Energy Physics - Theory (hep-th)
We study the gauge covariance of the fermion propagator in Maxwell-Chern-Simons planar quantum electrodynamics (QED$_3$) considering four-component spinors with parity-even and parity-odd mass terms both for fermions and photons. Starting with its tree level expression in the Landau gauge, we derive a non perturbative expression for this propagator in an arbitrary covariant gauge by means of its Landau-Khalatnikov-Fradkin transformation (LKFT). We compare our findings in the weak coupling regime with the direct one-loop calculation of the two-point Green function and observe perfect agreement up to a gauge independent term. We also reproduce results derived in earlier works as special cases of our findings.
- [25] arXiv:0811.3806 (cross-list from gr-qc) [ps, pdf, other]
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Title: Slow relaxation of rapidly rotating black holesAuthors: Shahar HodComments: 5 pagesJournal-ref: Physical Review D {\bf 78}, 084035 (2008)Subjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics (astro-ph); High Energy Physics - Theory (hep-th); Quantum Physics (quant-ph)
We study analytically the relaxation phase of perturbed, rapidly rotating black holes. In particular, we derive a simple formula for the fundamental quasinormal resonances of near-extremal Kerr black holes. The formula is expressed in terms of the black-hole physical parameters: omega=m Omega-i2 pi T(n+1/2), where T and Omega are the temperature and angular velocity of the black hole, and m is the azimuthal harmonic index of a co-rotating equatorial mode. This formula implies that the relaxation period tau sim 1/Im(omega) of the black hole becomes extremely long as the extremal limit T to 0 is approached. The analytically derived formula is shown to agree with direct numerical computations of the black-hole resonances. We use our results to demonstrate analytically the fact that near-extremal Kerr black holes saturate the recently proposed universal relaxation bound.
- [26] arXiv:0811.3934 (cross-list from astro-ph) [ps, pdf, other]
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Title: Inflationary trispectrum from graviton exchangeComments: 23 pages, 2 figures. Uses iopart.sty and feynmp.sty. v2: Bibliography updated, no change to textSubjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
We compute the connected four-point correlation function of the primordial curvature perturbation generated during inflation with standard kinetic terms, where the correlation is established via exchange of a graviton between two pairs of scalar fluctuations. Any such correlation yields a contribution to the scalar trispectrum of the order of the tensor to scalar ratio r. This contribution is numerically one order of magnitude larger than the one previously calculated on the basis of scalar perturbations interacting at a point and satisfies a simple relation in the limit where the momentum of the graviton which is exchanged becomes much smaller than the external momenta. We conclude that the total non-linearity parameter generated by single-field models of slow-roll inflation is at maximum tauNL ~ r.
- [27] arXiv:0811.4023 (cross-list from gr-qc) [ps, pdf, other]
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Title: Effective Actions from Loop Quantum Cosmology: Correspondence with Higher Curvature GravityComments: 12 pages, revtex4Subjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Quantum corrections of certain types and relevant in certain regimes can be summarised in terms of an effective action calculable, in principle, from the underlying theory. The demands of symmetries, local form of terms and dimensional considerations limit the form of the effective action to a great extent leaving only the numerical coefficients to distinguish different underlying theories. The effective action can be restricted to particular symmetry sectors to obtain the corresponding, {\em reduced effective action}. Alternatively, one can also quantize a classically (symmetry) reduced theory and obtain the corresponding effective action. These two effective actions can be compared. As an example, we compare the effective action(s) known in isotropic loop quantum cosmology with the Lovelock actions, as well as with more general actions, specialized to homogeneous isotropic space-times and find that the $\bar{\mu}$-scheme is singled out.
- [28] arXiv:0811.4293 (cross-list from hep-ph) [ps, pdf, other]
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Title: Turbulence in nonabelian gauge theoryComments: 12 pages, 2 figuresSubjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Lattice (hep-lat); High Energy Physics - Theory (hep-th); Nuclear Theory (nucl-th)
Kolmogorov wave turbulence plays an important role for the thermalization process following plasma instabilities in nonabelian gauge theories. We show that classical-statistical simulations in SU(2) gauge theory lead to the same Kolmogorov scaling exponent 3/2 as in scalar models. In the range of validity of resummed perturbation theory this result is shown to agree with the analytical estimate for not too high momenta. We study the effect of classical-statistical versus quantum corrections and demonstrate that the latter lead to the absence of turbulence in the far ultraviolet.
- [29] arXiv:0811.4409 (cross-list from hep-ph) [ps, pdf, other]
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Title: Dirac Gauginos in General Gauge MediationComments: 22 pages, no figuresSubjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
We extend the formulation by Meade, Seiberg and Shih of general gauge mediation of supersymmetry breaking to include Dirac masses for the gauginos. These appear through mixing of the visible sector gauginos with additional states in adjoint representations. We illustrate the method by reproducing the existing results in the literature for the gaugino and sfermion masses when preserving R-symmetry. We then explain how the generation of same sign masses for the two propagating degrees of freedom in the adjoint scalars can be achieved. We end by commenting on the use of the formalism for describing U(1) mixing.
- [30] arXiv:0811.4484 (cross-list from gr-qc) [ps, pdf, other]
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Title: Graviton, ghost and instanton condensation on horizon scale of the Universe. Dark energy as a macroscopic effect of quantum gravityAuthors: Leonid Marochnik (1), Daniel Usikov, Grigory Vereshkov (2) ((1) University of Maryland, College Park, (2) Research Institute of Physics, Southern Federal University)Comments: 92 pp, 4 figs, REVTeX 4Subjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics (astro-ph); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
We show that cosmological acceleration, Dark Energy (DE) effect is a consequence of the zero rest mass, conformal non-invariance of gravitons, and 1-loop finiteness of quantum gravity (QG). The effect is due to graviton-ghost condensates arising from the interference of quantum coherent states. The theory is constructed as follows: De Witt-Faddeev-Popov gauged path integral -> factorization of classical and quantum variables -> transition to the 1-loop approximation -> choice of ghost sector, satisfying 1-loop finiteness of the theory off the mass shell. The Bogolyubov-Born-Green-Kirckwood-Yvon (BBGKY) chain for the spectral function of gravitons renormalized by ghosts is used to build a theory of gravitons in the isotropic Universe. We found three exact solutions of the equations that describe virtual graviton and ghost condensates as well as condensates of instanton fluctuations. Exact solutions correspond to various condensates with different graviton-ghost compositions. The formalism of the BBGKY chain takes into account the contribution of non-relativistic matter in the formation of a common self-consistent gravitational field. It is shown that the era of non-relativistic matter dominance must be replaced by an era of dominance of graviton-ghost condensate. Pre-asymptotic state of DE is a condensate of virtual gravitons and ghosts with a constant conformal wavelength. The asymptotic state predicted by the theory is a graviton-ghost condensate of constant physical wavelength in the De Sitter space. Such DE phenomenon is presented in the form of the model that interpolates the exact solutions of equations of 1-loop QG. Processing of observational DE data extracted from the Hubble diagram for supernovae SNIa suggests that the graviton-ghost condensate is an adequate variable component of DE.
- [31] arXiv:0811.4496 (cross-list from gr-qc) [ps, pdf, other]
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Title: Topological Interpretation of Barbero-Immirzi ParameterComments: 14 pages, revtex4, no figuresSubjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
We set up a canonical Hamiltonian formulation for a theory of gravity based on a Lagrangian density made up of the Hilbert-Palatini term and, instead of the Holst term, the Nieh-Yan topological density. The resulting set of constraints in the time gauge are shown to lead to a theory in terms of a real SU(2) connection which is exactly the same as that of Barbero and Immirzi with the coefficient of the Nieh-Yan term identified as the inverse of Barbero-Immirzi parameter. This provides a topological interpretation for this parameter. Matter coupling can then be introduced in the usual manner, {\em without} changing the universal topological Nieh-Yan term.
- [32] arXiv:0812.0243 (cross-list from math.DG) [ps, pdf, other]
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Title: Causal boundaries and holography on wave type spacetimesAuthors: Miguel SánchezComments: Submitted to the proceedings of WCNA (Orlando '08). 34 pages, including 10 figures and one table; LatexSubjects: Differential Geometry (math.DG); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th); Mathematical Physics (math-ph)
The notion of causal boundary of a spacetime has been a controversial topic during the last three decades. Moreover, recently the role of the boundary in the AdS/CFT correspondence for plane waves, have stimulated its redefinition with some possible alternatives.
Our aim is threefold. First, to review the different classical approaches to boundaries of spacetimes, emphasizing their drawbacks and the progressive redefinitions of the c-boundary. Second, to explain how plane waves and AdS/CFT correspondence come into play, stressing the role of the c-boundary as the holographic boundary in this correspondence. And, third, to discuss the present-day status of the c-boundary, making clear the arguments of a definitive proposal.
Replacements for Tue, 2 Dec 08
- [33] arXiv:0801.0482 (replaced) [ps, pdf, other]
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Title: Geometrical properties of the trans-spherical solutions in higher dimensionsComments: 14 pages, 2 figures, Title changedSubjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
- [34] arXiv:0801.0896 (replaced) [ps, pdf, other]
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Title: Deformation of Curved BPS Domain Walls and Supersymmetric Flows on 2d Kähler-Ricci SolitonComments: 19 pages, no figures. Typos, grammar, and minor mistakes corrected. Abstract and almost all sections improved. References, acknowledgement, and an appendix added. Accepted in Commun. Math. PhysSubjects: High Energy Physics - Theory (hep-th); Mathematical Physics (math-ph); Differential Geometry (math.DG); Dynamical Systems (math.DS)
- [35] arXiv:0806.3252 (replaced) [ps, pdf, other]
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Title: On Matrix Model Formulations of Noncommutative Yang-Mills TheoriesComments: 24 pages, no figure, reference added, minor corrections, to be published in PRDJournal-ref: Phys. Rev. D 78, 105017 (2008)Subjects: High Energy Physics - Theory (hep-th); High Energy Physics - Lattice (hep-lat)
- [36] arXiv:0806.3363 (replaced) [ps, pdf, other]
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Title: Proper acceleration, geometric tachyon and dynamics of a fundamental string near D$p$ branesComments: 26 pages, v2: added references, v3: one ref. updatedSubjects: High Energy Physics - Theory (hep-th)
- [37] arXiv:0807.4223 (replaced) [ps, pdf, other]
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Title: Comments on higher-spin symmetriesAuthors: Xavier BekaertComments: 53+1 pages, some more typos corrected and minor clarifications added. Accepted for publication in IJGMMPSubjects: High Energy Physics - Theory (hep-th)
- [38] arXiv:0808.0190 (replaced) [ps, pdf, other]
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Title: Singularities in loop quantum cosmologyComments: 5 pages, 3 figures. v2: Comments and references added. v3: Minor additions, version to appear in PRLSubjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics (astro-ph); High Energy Physics - Theory (hep-th)
- [39] arXiv:0808.3236 (replaced) [ps, pdf, other]
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Title: Coset Space Dimensional Reduction and Wilson Flux Breaking of Ten-Dimensional N=1, E(8) Gauge TheoryComments: 45 pages, 2 figures, 10 tables, uses xy.sty, longtable.sty, ltxtable.sty, (a shorter version will be published in Eur. Phys. J. C)Subjects: High Energy Physics - Theory (hep-th); High Energy Physics - Phenomenology (hep-ph)
- [40] arXiv:0809.0555 (replaced) [ps, pdf, other]
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Title: Topological Black Holes in Brans-Dicke-Maxwell TheoryComments: 12 pagesSubjects: High Energy Physics - Theory (hep-th)
- [41] arXiv:0809.1086 (replaced) [ps, pdf, other]
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Title: On the Lie-algebraic origin of metric 3-algebrasComments: 29 pages (v3: final version to appear in CMP. Example 17 has been improved.)Subjects: High Energy Physics - Theory (hep-th); Representation Theory (math.RT)
- [42] arXiv:0809.4441 (replaced) [ps, pdf, other]
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Title: Hilltop QuintessenceComments: 7 pages, 9 figures, references and discussion addedSubjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
- [43] arXiv:0809.5180 (replaced) [ps, pdf, other]
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Title: Supergravities without an Action: Gauging the TromboneComments: 40 pages; v2: refs added, minor corrections, version to be published in NPBSubjects: High Energy Physics - Theory (hep-th)
- [44] arXiv:0811.0439 (replaced) [ps, pdf, other]
- [45] arXiv:0811.3482 (replaced) [ps, pdf, other]
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Title: Note on Generalized Janus ConfigurationsComments: 27 pages; References addedSubjects: High Energy Physics - Theory (hep-th)
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