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Title: Theoretical priors in scalar-tensor cosmologies: Thawing quintessence

Journal Article · · Physical Review D
ORCiD logo [1];  [2];  [2];  [2]; ORCiD logo [3]
  1. Consejo Superior de Investigaciones Científicas, Madrid (Spain). Instituto de Física Fundamental; Institut de Ciències del Cosmos (UB–IEEC), Barcelona (Spain)
  2. Univ. of Oxford (United Kingdom)
  3. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Université Paris Saclay, Gif-sur-Yvette (France). Institut de Physique Théorique; Alternative Energies and Atomic Energy Commission (CEA), Gif-sur-Yvette (France); Centre National de la Recherche Scientifique (CNRS), Gif-sur-Yvette (France)
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The late time acceleration of the Universe can be characterized in terms of an extra, time-dependent, component of the Universe - dark energy. The simplest proposal for dark energy is a scalar-tensor theory - quintessence - which consists of a scalar field, φ, whose dynamics is solely dictated by its potential, V(φ). Such a theory can be uniquely characterized by the equation of state of the scalar field energy momentum-tensor. We find the time dependence of the equation of state for a broad family of potentials and, using this information, we propose an analytic prior distribution for the most commonly used parametrization. Here, we show that this analytic prior can be used to accurately predict the distribution of observables for the next generation of cosmological surveys. Including the theoretical priors in the comparison with observations considerably improves the constraints on the equation of state.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Ministry of Industry, Science and Innovation of Spain; European Research Council (ERC); STFC
Grant/Contract Number:
AC02-05CH11231; BES-2016-077038; 693024
OSTI ID:
1632139
Journal Information:
Physical Review D, Vol. 101, Issue 6; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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