Theoretical priors in scalar-tensor cosmologies: Thawing quintessence
Abstract
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.
- Authors:
-
[1];
[3]
- Consejo Superior de Investigaciones Científicas, Madrid (Spain). Instituto de Física Fundamental; Institut de Ciències del Cosmos (UB–IEEC), Barcelona (Spain)
- Univ. of Oxford (United Kingdom)
- 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)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); Ministry of Industry, Science and Innovation of Spain; European Research Council (ERC); STFC
- OSTI Identifier:
- 1632139
- Grant/Contract Number:
- AC02-05CH11231; BES-2016-077038; 693024
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 101; Journal Issue: 6; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
García-García, Carlos, Bellini, Emilio, Ferreira, Pedro G., Traykova, Dina, and Zumalacárregui, Miguel. Theoretical priors in scalar-tensor cosmologies: Thawing quintessence. United States: N. p., 2020.
Web. doi:10.1103/PhysRevD.101.063508.
García-García, Carlos, Bellini, Emilio, Ferreira, Pedro G., Traykova, Dina, & Zumalacárregui, Miguel. Theoretical priors in scalar-tensor cosmologies: Thawing quintessence. United States. https://doi.org/10.1103/PhysRevD.101.063508
García-García, Carlos, Bellini, Emilio, Ferreira, Pedro G., Traykova, Dina, and Zumalacárregui, Miguel. Thu .
"Theoretical priors in scalar-tensor cosmologies: Thawing quintessence". United States. https://doi.org/10.1103/PhysRevD.101.063508. https://www.osti.gov/servlets/purl/1632139.
@article{osti_1632139,
title = {Theoretical priors in scalar-tensor cosmologies: Thawing quintessence},
author = {García-García, Carlos and Bellini, Emilio and Ferreira, Pedro G. and Traykova, Dina and Zumalacárregui, Miguel},
abstractNote = {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.},
doi = {10.1103/PhysRevD.101.063508},
journal = {Physical Review D},
number = 6,
volume = 101,
place = {United States},
year = {Thu Mar 05 00:00:00 EST 2020},
month = {Thu Mar 05 00:00:00 EST 2020}
}
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