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

Journal article

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. 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: García-García, C; Ruíz-Lapuente, P; Alonso, D; Zumalacárregui, M

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: IOP Publishing
• Journal: Journal of Cosmology and Astroparticle Physics
• Volume: 2019
• Issue: 07
• Article number: 25
• Publication date: 2019-07-16
• Acceptance date: 2019-06-26
• DOI: 10.1088/1475-7516/2019/07/025
• EISSN: 1475-7516
• Language: English
• Keywords: FFR