Asymptotically safe cosmology

Journal Article · Fri Jul 01 04:00:00 EDT 2011 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2011/07/019· OSTI ID:22277778

Hindmarsh, Mark; Litim, Daniel; Rahmede, Christoph ^[1]

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1. Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH (United Kingdom)

We study quantum modifications to cosmology in a Friedmann-Robertson-Walker universe with and without scalar fields by taking the renormalisation group running of gravitational and matter couplings into account. We exploit the Bianchi identity to relate the renormalisation group scale with scale factor and derive the improved cosmological evolution equations. We find two types of cosmological fixed points where the renormalisation group scale either freezes in, or continues to evolve with scale factor. We discuss the implications of each of these, and classify the different cosmological fixed points with and without gravity displaying an asymptotically safe renormalisation group fixed point. We state conditions of existence for an inflating ultraviolet cosmological fixed point for Einstein gravity coupled to a scalar field. We also discuss other fixed point solutions such as 'scaling' solutions, or fixed points with equipartition between kinetic and potential energies.

• OSTI ID: 22277778
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 07 Vol. 2011; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMOLOGICAL MODELS
COSMOLOGY
EINSTEIN FIELD EQUATIONS
EVOLUTION
GRAVITATION
MATHEMATICAL SOLUTIONS
POTENTIAL ENERGY
RENORMALIZATION
SCALAR FIELDS
ULTRAVIOLET RADIATION
UNIVERSE