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

Journal Article · · Journal of Cosmology and Astroparticle Physics
 [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)
+ Show Author Affiliations

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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
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)
Grant/Contract Number:
AC02-05CH11231; AYA2015-67854-P; BES-2016-077038; ST/P004474/1
OSTI ID:
1581073
Journal Information:
Journal of Cosmology and Astroparticle Physics, Vol. 2019, Issue 07; ISSN 1475-7516
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Figures / Tables (16)

Figure 1(p. 8)figure Figure 1
Table 1(p. 9)table Table 1
Table 2(p. 10)table Table 2
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Figure 2(p. 14)figure Figure 2
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Figure 5(p. 16)figure Figure 5
Table 8(p. 16)table Table 8
Figure 6(p. 17)figure Figure 6
Figure 7(p. 17)figure Figure 7
Figure 8(p. 19)figure Figure 8

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