Constraining cosmic expansion and gravity with galaxy redshift surveys

Journal Article · Fri Feb 01 00:00:00 EST 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/02/007· OSTI ID:22283007

Daniel, Scott F. ^[1]

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1. Department of Astronomy, University of Washington, 3910 15th Ave NE, Seattle, WA (United States)

We analyze the science reach of a next generation galaxy redshift survey such as BigBOSS to fit simultaneously for time varying dark energy equation of state and time- and scale-dependent gravity. The simultaneous fit avoids potential bias from assuming ΛCDM expansion or general relativity and leads to only modest degradation in constraints. Galaxy bias, fit freely in redshift bins, is self calibrated by spectroscopic measurements of redshift space distortions and causes little impact. The combination of galaxy redshift, cosmic microwave background, and supernova distance data can deliver 5-10% constraints on 6 model independent modified gravity quantities.

• OSTI ID: 22283007
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 02; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMOLOGICAL CONSTANT
COSMOLOGY
EQUATIONS OF STATE
EXPANSION
GALAXIES
GENERAL RELATIVITY THEORY
GRAVITATION
NONLUMINOUS MATTER
POTENTIALS
RED SHIFT
RELICT RADIATION