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SUMMARY:Generalized unimodular gravity: cospological applications and reno
rmalizeability
DTSTART;VALUE=DATE-TIME:20200305T184800Z
DTEND;VALUE=DATE-TIME:20200305T190000Z
DTSTAMP;VALUE=DATE-TIME:20201202T060815Z
UID:indico-contribution-284@rich2018.org
DESCRIPTION:Speakers: Nikita Kolganov (MIPT and BLTP JINR)\nThe recently s
uggested generalized unimodular gravity theory\, which was originally put
forward as a model of dark energy\, can serve as a model of cosmological i
nflation driven by the effective perfect fluid—the dark purely gravitati
onal sector of the theory. Its excitations are scalar gravitons that can g
enerate\, in the domain free from ghost and gradient instabilities\, the r
ed tilted primordial power spectrum of cosmic microwave background (CMB) p
erturbations matching with observations. The reconstruction of the paramet
ric dependence of the action of the theory in the early inflationary unive
rse is qualitatively sketched from the cosmological data and satisfies the
naturalness criterion—the O(1) magnitude of all its parameters. In part
icular\, the only phenomenological exponentially big parameter—the e-fol
ding factor with N∼60\, leads in this model to a specific expression for
tensor-to-scalar ratio r ≃ 0.004\, matching with the existing observati
onal bounds on r and the CMB spectral index. The alternative possibilities
of generating the cosmological acceleration and possibility of generalize
d renormalizeability of the theory are also discussed.\n\nhttps://mosphys.
ru/indico/event/5/contributions/284/
LOCATION:HSE Study Center “Voronovo”
URL:https://mosphys.ru/indico/event/5/contributions/284/
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