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Title: α-attractor dark energy in view of next-generation cosmological surveys

Abstract

The α-attractor inflationary models are nowadays favored by CMB Planck observations. Their similarity with canonical quintessence models motivates the exploration of a common framework that explains both inflation and dark energy. Here, we study the expected constraints that next-generation cosmological experiments will be able to impose for the dark energy α-attractor model. We systematically account for the constraining power of SNIa from WFIRST, BAO from DESI and WFIRST, galaxy clustering and shear from LSST and Stage-4 CMB experiments. We assume a tensor-to-scalar ratio, 10-3 < r < 10-2, which permits to explore the wide regime sufficiently close, but distinct, to a cosmological constant, without need of fine tunning the initial value of the field. We find that the combination S4CMB + LSST + SNIa will achieve the best results, improving the FoM by almost an order of magnitude; respect to the S4CMB + BAO + SNIa case. We find this is also true for the FoM of the w0-wa parameters. Therefore, future surveys will be uniquely able to probe models connecting early and late cosmic acceleration.

Authors:
 [1];  [2];  [3];  [4]
  1. Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain); Institut de Ciencies del Cosmos (UB-IEEC), Barcelona (Spain); Univ. of California, Berkeley, CA (United States). Berkeley Center for Cosmological Physics; Univ. of Oxford (United Kingdom)
  2. Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain); Institut de Ciencies del Cosmos (UB-IEEC), Barcelona (Spain)
  3. Univ. of Oxford (United Kingdom)
  4. Univ. of California, Berkeley, CA (United States). Berkeley Center for Cosmological Physics; Universite Paris-Saclay, Orsay (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 Social Fund (ESF); Science and Technology Facilities Council (STFC) (United Kingdom)
OSTI Identifier:
1581073
Grant/Contract Number:  
AC02-05CH11231; AYA2015-67854-P; BES-2016-077038; ST/P004474/1
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2019; Journal Issue: 07; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

García-García, Carlos, Ruíz-Lapuente, Pilar, Alonso, David, and Zumalacárregui, M. α-attractor dark energy in view of next-generation cosmological surveys. United States: N. p., 2019. Web. doi:10.1088/1475-7516/2019/07/025.
García-García, Carlos, Ruíz-Lapuente, Pilar, Alonso, David, & Zumalacárregui, M. α-attractor dark energy in view of next-generation cosmological surveys. United States. doi:https://doi.org/10.1088/1475-7516/2019/07/025
García-García, Carlos, Ruíz-Lapuente, Pilar, Alonso, David, and Zumalacárregui, M. Tue . "α-attractor dark energy in view of next-generation cosmological surveys". United States. doi:https://doi.org/10.1088/1475-7516/2019/07/025. https://www.osti.gov/servlets/purl/1581073.
@article{osti_1581073,
title = {α-attractor dark energy in view of next-generation cosmological surveys},
author = {García-García, Carlos and Ruíz-Lapuente, Pilar and Alonso, David and Zumalacárregui, M.},
abstractNote = {The α-attractor inflationary models are nowadays favored by CMB Planck observations. Their similarity with canonical quintessence models motivates the exploration of a common framework that explains both inflation and dark energy. Here, we study the expected constraints that next-generation cosmological experiments will be able to impose for the dark energy α-attractor model. We systematically account for the constraining power of SNIa from WFIRST, BAO from DESI and WFIRST, galaxy clustering and shear from LSST and Stage-4 CMB experiments. We assume a tensor-to-scalar ratio, 10-3 < r < 10-2, which permits to explore the wide regime sufficiently close, but distinct, to a cosmological constant, without need of fine tunning the initial value of the field. We find that the combination S4CMB + LSST + SNIa will achieve the best results, improving the FoM by almost an order of magnitude; respect to the S4CMB + BAO + SNIa case. We find this is also true for the FoM of the w0-wa parameters. Therefore, future surveys will be uniquely able to probe models connecting early and late cosmic acceleration.},
doi = {10.1088/1475-7516/2019/07/025},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 07,
volume = 2019,
place = {United States},
year = {2019},
month = {7}
}

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