Consistent early and late time cosmology from the RG flow of gravity - INSPIRE

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Consistent early and late time cosmology from the RG flow of gravity

Giulia Gubitosi
(
- Nijmegen U., IMAPP and
- Rome U.
)
,
Robin Ooijer
(
- Nijmegen U., IMAPP
)
,
Chris Ripken
(
- Nijmegen U., IMAPP
)
,
Frank Saueressig
(
- Nijmegen U., IMAPP
)

Jun 26, 2018

20 pages

Published in:

JCAP 12 (2018) 004

Published: Dec 4, 2018

e-Print:

1806.10147 [hep-th]

DOI:

10.1088/1475-7516/2018/12/004

View in:

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Abstract: (IOP)

We investigate the compatibility of cosmological constraints on inflation and the cosmological constant with the asymptotic safety scenario of quantum gravity. The effective action is taken to be of f(R) form, truncated to second order. The flow generated by the Functional Renormalisation Group Equation is analysed and it is found to allow for trajectories that are compatible with the observational constraints on the parameters of the action, both at early and late cosmological times. In particular, the gravitational effective dynamics generated in the trans-Planckian regime flows to Starobinsky inflation at early times and to standard Einstein Gravity with a cosmological constant at late times. Moreover, the cosmological constant acquires an energy dependence at 10−2 eV, increasing from its current value of 10−66 eV2 on Hubble scale to a value of 1030 eV2 at inflation scale.

Note:

v2 matches the JCAP accepted version

renormalization group: flow
cosmological model: time
scale: inflation
cosmological constant
gravitation
energy dependence
asymptotic safety
effective action
quantum gravity
trajectory

References(148)

Figures(3)

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