Viable cosmological solutions in massive bimetric gravity

Journal Article · Sat Mar 01 00:00:00 EST 2014 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2014/03/029· OSTI ID:22370629

Koennig, Frank; Amendola, Luca ^[1]; Patil, Aashay ^[2]

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1. Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, Heidelberg, 69120 (Germany)
2. Department of Physics, Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pashan, Pune, 411008 (India)

We find the general conditions for viable cosmological solution at the background level in bigravity models. Furthermore, we constrain the parameters by comparing to the Union 2.1 supernovae catalog and identify, in some cases analytically, the best fit parameter or the degeneracy curve among pairs of parameters. We point out that a bimetric model with a single free parameter predicts a simple relation between the equation of state and the density parameter, fits well the supernovae data and is a valid and testable alternative to ΛCDM. Additionally, we identify the conditions for a phantom behavior and show that viable bimetric cosmologies cannot cross the phantom divide.

• OSTI ID: 22370629
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 03; 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
CATALOGS
COSMOLOGY
DENSITY
DIAGRAMS
EQUATIONS OF STATE
GRAVITATION
SUPERNOVAE