Quintessential inflation with α-attractors

Dimopoulos, Konstantinos and Owen, Charlotte (2017) Quintessential inflation with α-attractors. Journal of Cosmology and Astroparticle Physics, 2017 (6). ISSN 1475-7516

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Abstract

A novel approach to quintessential inflation model building is studied, within the framework of α-attractors, motivated by supergravity theories. Inflationary observables are in excellent agreement with the latest CMB observations, while quintessence explains the dark energy observations without any fine-tuning. The model is kept intentionally minimal, avoiding the introduction of many degrees of freedom, couplings and mass scales. In stark contrast to ΛCDM, for natural values of the parameters, the model attains transient accelerated expansion, which avoids the future horizon problem, while it maintains the field displacement mildly sub-Planckian such that the flatness of the quintessential tail is not lifted by radiative corrections and violations of the equivalence principle (fifth force) are under control. In particular, the required value of the cosmological constant is near the eletroweak scale. Attention is paid to the reheating of the Universe, which avoids gravitino overproduction and respects nucleosynthesis constraints. Kination is treated in a model independent way. A spike in gravitational waves, due to kination, is found not to disturb nucleosynthesis as well.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Cosmology and Astroparticle Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/aacsb/disciplinebasedresearch
Subjects:
?? COSMOLOGYDARK ENERGYCOSMOLOGY OF THEORIES BEYOND THE SMCOSMIC INFLATIONPHYSICS AND ASTRONOMY(ALL)ASTRONOMY AND ASTROPHYSICSDISCIPLINE-BASED RESEARCH ??
ID Code:
86839
Deposited By:
Deposited On:
23 Jun 2017 13:34
Refereed?:
Yes
Published?:
Published
Last Modified:
17 Sep 2023 02:06