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Showing results 1 through 20 (of 20 total) for au:ishak

1. arXiv:0905.2470 [ps, pdf, other]

Title: Contiguous redshift parameterizations of the growth index

Authors: Mustapha Ishak, Jason Dossett (The University of Texas at Dallas)

Comments: 7 pages, 6 figures, matches PRD accepted version

Journal-ref: Phys. Rev. D 80, 043004 (2009)

Subjects: Cosmology and Extragalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc)

2. arXiv:0903.0001 [ps, pdf, other]

Title: Growth factor parametrization in curved space

Authors: Yungui Gong, Mustapha Ishak, Anzhong Wang

Comments: latex, 8 figures

Journal-ref: Phys.Rev.D80:023002,2009

Subjects: Cosmology and Extragalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph)

3. arXiv:0810.4956 [ps, pdf, other]

Title: More on Lensing by a Cosmological Constant

Authors: Mustapha Ishak, Wolfgang Rindler, Jason Dossett (The University of Texas at Dallas)

Comments: 5 pages

Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc)

4. arXiv:0808.0951 [ps, pdf, other]

Title: A minimal set of invariants as a systematic approach to higher order gravity models

Authors: Mustapha Ishak, Jacob Moldenhauer (The University of Texas at Dallas)

Comments: 15 pages, 4 figures, matches JCAP accepted version

Journal-ref: JCAP 0901:024, 2009

Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)

5. arXiv:0801.3514 [ps, pdf, other]

Title: Light Deflection, Lensing, and Time Delays from Gravitational Potentials and Fermat's Principle in the Presence of a Cosmological Constant

Authors: Mustapha Ishak (The University of Texas at Dallas)

Comments: 6 pages, 1 figure, matches version published in PRD

Journal-ref: Phys.Rev.D78:103006,2008

Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc)

6. arXiv:0710.4726 [ps, pdf, other]

Title: A New Independent Limit on the Cosmological Constant/Dark Energy from the Relativistic Bending of Light by Galaxies and Clusters of Galaxies

Authors: Mustapha Ishak, Wolfgang Rindler, Jason Dossett, Jacob Moldenhauer, Chris Allison (The University of Texas at Dallas)

Comments: 5 pages, 1 figure, matches version published in MNRAS

Journal-ref: MNRAS 388, 1279-1283 (2008)

Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)

7. arXiv:0709.2948 [ps, pdf, other]

Title: The Contribution of the Cosmological Constant to the Relativistic Bending of Light Revisited

Authors: Wolfgang Rindler, Mustapha Ishak (The University of Texas at Dallas)

Comments: 5 pages, 2 figures

Journal-ref: Phys.Rev.D76:043006,2007

Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)

8. arXiv:0708.2943 [ps, pdf, other]

Title: Dark Energy or Apparent Acceleration Due to a Relativistic Cosmological Model More Complex than FLRW?

Authors: Mustapha Ishak, James Richardson, David Garred, Delilah Whittington, Anthony Nwankwo, Roberto Sussman

Comments: 6 pages, 1 figure, matches version published in PRD

Journal-ref: Phys.Rev.D78:123531,2008

Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)

9. arXiv:astro-ph/0701671 [ps, pdf, other]

Title: Intrinsic galaxy alignments from the 2SLAQ and SDSS surveys: luminosity and redshift scalings and implications for weak lensing surveys

Authors: Christopher M. Hirata, Rachel Mandelbaum, Mustapha Ishak, Uros Seljak, Robert Nichol, Kevin A. Pimbblet, Nicholas P. Ross, David Wake

Comments: Matches MNRAS accepted version. Extended/updated data tables and expanded comparison to theory

Journal-ref: Mon.Not.Roy.Astron.Soc.381:1197-1218,2007

Subjects: Astrophysics (astro-ph)

10. arXiv:astro-ph/0509026 [ps, pdf, other]

Title: Detection of large scale intrinsic ellipticity-density correlation from the Sloan Digital Sky Survey and implications for weak lensing surveys

Authors: Rachel Mandelbaum, Christopher M. Hirata, Mustapha Ishak, Uros Seljak, Jonathan Brinkmann

Comments: 16 pages, matches version published in MNRAS (only minor changes in presentation from original version)

Journal-ref: Mon.Not.Roy.Astron.Soc.367:611-626,2006

Subjects: Astrophysics (astro-ph)

11. arXiv:astro-ph/0507184 [ps, pdf, other]

Title: Probing Cosmic Acceleration Beyond the Equation of State: Distinguishing between Dark Energy and Modified Gravity Models

Authors: Mustapha Ishak (1,2), Amol Upadhye (2), David N. Spergel (2) ((1) The University of Texas at Dallas, (2) Princeton University)

Comments: 8 pages, 7 figures; expanded paper; matches PRD accepted version; corrected growth rate formula; main results and conclusion unchanged

Journal-ref: Phys.Rev.D74:043513,2006

Subjects: Astrophysics (astro-ph); High Energy Physics - Theory (hep-th)

12. arXiv:astro-ph/0504416 [ps, pdf, other]

Title: Remarks on the formulation of the cosmological constant/dark energy problems

Authors: Mustapha Ishak (The University of Texas at Dallas)

Comments: 32 pages, 9 figures. Significantly expanded version. To appear in Foundations of Physics Journal

Journal-ref: Found.Phys.37:1470-1498,2007

Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)

13. arXiv:astro-ph/0501594 [ps, pdf, other]

Title: Probing decisive answers to dark energy questions from cosmic complementarity and lensing tomography

Authors: Mustapha Ishak (Princeton University)

Comments: 14 pages, 5 figures; matches MNRAS accepted version

Journal-ref: Mon.Not.Roy.Astron.Soc. 363 (2005) 469-478

Subjects: Astrophysics (astro-ph)

14. arXiv:astro-ph/0411803 [ps, pdf, other]

Title: Dynamical dark energy: Current constraints and forecasts

Authors: Amol Upadhye, Mustapha Ishak, Paul J. Steinhardt (Princeton University)

Comments: 24 pages, 20 figures. Added SN systematic uncertainties, extended discussion

Journal-ref: Phys.Rev.D72:063501,2005

Subjects: Astrophysics (astro-ph)

15. arXiv:gr-qc/0405099 [ps, pdf, other]

Title: On perfect fluid models in non-comoving observational spherical coordinates

Authors: Mustapha Ishak (Princeton University)

Comments: 8 pages, 1 figure. To appear in Phys.Rev.D

Journal-ref: Phys.Rev. D69 (2004) 124027

Subjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics (astro-ph)

16. arXiv:astro-ph/0405042 [ps, pdf, other]

Title: Spectroscopic source redshifts and parameter constraints from weak lensing and CMB

Authors: Mustapha Ishak, Christopher M. Hirata (Princeton University)

Comments: 8 pages, 3 figures. Final form to appear in Phys Rev D

Journal-ref: Phys.Rev. D71 (2005) 023002

Subjects: Astrophysics (astro-ph)

17. arXiv:astro-ph/0308446 [ps, pdf, other]

Title: Weak Lensing and CMB: Parameter forecasts including a running spectral index

Authors: Mustapha Ishak, Christopher M. Hirata, Patrick McDonald, Uros Seljak

Comments: 12 pages, 10 figures, revtex4. Final form to appear in Phys Rev D

Journal-ref: Phys.Rev.D69:083514,2004

Subjects: Astrophysics (astro-ph)

18. arXiv:gr-qc/0104002 [ps, pdf, other]

Title: The Tolman VII solution, trapped null orbits and w - modes

Authors: Nicholas Neary, Mustapha Ishak, Kayll Lake

Comments: 5 pages revtex. 10 figures png. Further information at this http URL

Journal-ref: Phys.Rev. D64 (2001) 084001

Subjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics (astro-ph)

19. arXiv:gr-qc/0007073 [ps, pdf, other]

Title: Exact Solutions with w - modes

Authors: Mustapha Ishak, Luke Chamandy, Nicholas Neary, Kayll Lake

Comments: Final form to appear in Phys. Rev. D. Further information on the web at this http URL

Journal-ref: Phys.Rev. D64 (2001) 024005

Subjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics (astro-ph)

20. arXiv:gr-qc/9911012 [ps, pdf, other]

Title: GRLite and GRTensorJ: Graphical user interfaces to the computer algebra system GRTensorII

Authors: Mustapha Ishak, Peter Musgrave, John Mourra, Jonathan Stern, Kayll Lake

Comments: To appear in the Proceedings of the Eighth Canadian Conference on General Relativity and Relativistic Astrophysics . Requires two figures, grliteview.png and grtensorjview.png

Subjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics (astro-ph); Materials Science (cond-mat.mtrl-sci); Computational Physics (physics.comp-ph)