Viable Palatini-f(R) cosmologies with generalized dark matter

Journal Article · Wed Aug 15 00:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.043527· OSTI ID:21027592

Koivisto, Tomi ^[1]

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1. Helsinki Institute of Physics, P.O. Box 64, FIN-00014 Helsinki, Finland, and Department of Physical Sciences, Helsinki University, P.O. Box 64, FIN-00014 Helsinki (Finland)

We study the formation of large-scale structure in universes dominated by dark matter and driven to accelerated expansion by f(R) gravity in the Palatini formalism. If the dark matter is cold, practically all of these models are ruled out because they fail to reproduce the observed matter power spectrum. We point out that if the assumption that dark matter is perfect and pressureless at all scales is relaxed, nontrivial alternatives to a cosmological constant become viable within this class of modified gravity models.

• OSTI ID: 21027592
• Journal Information: Physical Review. D, Particles Fields, Vol. 76, Issue 4; Other Information: DOI: 10.1103/PhysRevD.76.043527; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMOLOGICAL CONSTANT
COSMOLOGY
ENERGY SPECTRA
GRAVITATION
NONLUMINOUS MATTER
UNIVERSE