Higgs-dilaton cosmology: From the early to the late Universe

By Juan García-Bellido, J. Rubio, M. Shaposhnikov, Daniel Zenhausern. 2011

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We consider a minimal scale-invariant extension of the standard model of particle physics combined with unimodular gravity formulated in [M. Shaposhnikov and D. Zenhausern, Phys. Lett. B 671, 187 (2009).]. This theory is able to describe not only an inflationary stage, related to the standard model Higgs field, but also a late period of dark-energy domination, associated with an almost massless dilaton. A number of parameters can be fixed by inflationary physics, allowing us to make specific predictions for any subsequent period. In particular, we derive a relation between the tilt of the primordial spectrum of scalar fluctuations, n(s), and the present value of the equation of state parameter of dark energy (DE), w(DE)(0). We find bounds for the scalar tilt, n(s) -1. The relation between n(s) and w(DE)(0) allows us to use the current observational bounds on n(s) to further constrain the dark-energy equation of state to 0 < 1 + w(DE)(0) < 0: 02, which is to be confronted with future dark-energy surveys.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/847668c34e3147d0df0679dc18f0009d2e80598e

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Citations in the corpus

The Phenomenology of Right Handed Neutrinos (2013, unknown): “Various aspects of this model have been studied in the past by different authors [119, 132, 133, 147, 148, 151, 203, 250, 253, 266, 422, 424, 468, 497, 498, 524, 540, 544, 552, 553, 555, 571, 572, 574–588], see [203, 251, 589] for a detailed introduction and review.”
Higgs Inflation (2018, background): “[93, 97]), the equation of 18 Among the possible values of β in the presence of gravity, the case β = 0 seems also preferred [85, 211, 212], see also Refs.”
Dark Matter, Baryogenesis and Neutrino Oscillations from Right Handed Neutrinos (2012, background): “Moreover, it was suggested that cosmic inflation [31–33] and the current accelerated expansion [34–37] may also be accommodated in this framework by modifications in the gravitational sector, which we will not discuss here4.”