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Isocurvature fluctuations in the effective Newton's constant

Journal
Date Issued
2019
Author(s)
•
Braglia, M.
•
•
Ballardini, M.
•
Umiltà, C.
DOI
Description
We acknowledge support by the "ASI/INAF Agreement 2014-024-R.0 for the Planck LFI Activity of Phase E2’’. We also acknowledge financial contribution from the agreement ASI n. I/023/12/0 "Attivitá relative alla fase B2/C per la missione Euclid". DP and FF acknowledge financial support by ASI Grant 2016-24-H.0. MB is supported by the South African SKA Project and by the Claude Leon Foundation, South Africa.
Abstract
We present a new isocurvature mode present in scalar-tensor theories of gravity that corresponds to a regular growing solution in which the energy of the relativistic degrees of freedom and the scalar field that regulates the gravitational strength compensate during the radiation dominated epoch on scales much larger than the Hubble radius. We study this isocurvature mode and its impact on anisotropies of the cosmic microwave background for the simplest scalar-tensor theory, i.e. the extended Jordan-Brans-Dickegravity, in which the scalar field also drives the acceleration of the Universe. We use Planck data to constrain the amplitude of this isocurvature mode in the case of fixed correlation with the adiabatic mode and we show how this mode could be generated in a simple two field inflation model.
Volume
25
Start page
100307
Uri
Url
Issn Identifier
2212-6864
Ads BibCode
2019PDU....25..307P
Rights
open.access
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