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Galileon gravity in light of ISW, CMB, BAO and H-0 data
Stockholm Univ, AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;LBL, Berkeley Ctr Cosmol Phys, Berkeley, CA 94720 USA.;Univ Calif Berkeley, Berkeley, CA 94720 USA..ORCID iD: 0000-0002-9943-6490
Univ Helsinki, Phys Dept, POB 64, FIN-00014 Helsinki, Finland.;Univ Helsinki, Helsinki Inst Phys, POB 64, FIN-00014 Helsinki, Finland..ORCID iD: 0000-0003-0741-1382
Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85741 Garching, Germany..
2017 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, no 10, article id 020Article in journal (Refereed) Published
Abstract [en]

Cosmological models with Galileon gravity are an alternative to the standard ACDM paradigm with testable predictions at the level of its self-accelerating solutions for the expansion history, as well as large-scale structure formation. Here, we place constraints on the full parameter space of these models using data from the cosmic microwave background (CMB) (including lensing), baryonic acoustic oscillations (BAO) and the Integrated Sachs Wolfe (ISW) effect. We pay special attention to the ISW effect for which we use the cross spectra, C-l(Tg), of CMB temperature maps and foreground galaxies from the WISE survey. The sign of C-l(Tg) is set by the time evolution of the lensing potential in the redshift range of the galaxy sample: it is positive if the potential decays (like in ACDM), negative if it deepens. We constrain three subsets of Galileon gravity separately known as the Cubic, Quartic and Quintic Galileons. The cubic Galileon model predicts a negative C-l(Tg) and exhibits a 7.8 sigma tension with the data, which effectively rules it out. For the quartic and quintic models the ISW data also rule out a significant portion of the parameter space but permit regions where the goodness-of-fit is comparable to ACDM. The data prefers a non zero sum of the neutrino masses (Sigma m(v) approximate to 0.5eV) with similar to 5 sigma significance in these models. The best-fitting models have values of Ho consistent with local determinations, thereby avoiding the tension that exists in ACDM. We also identify and discuss a similar to 2 sigma tension that Galileon gravity exhibits with recent BAO measurements. Our analysis shows overall that Galileon cosmologies cannot be ruled out by current data but future lensing, BAO and ISW data hold strong potential to do so.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2017. no 10, article id 020
Keywords [en]
modified gravity, integrated Sachs-Wolfe effect, cosmological parameters from CMBR, cosmological parameters from LSS
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-243577DOI: 10.1088/1475-7516/2017/10/020ISI: 000413206300003OAI: oai:DiVA.org:kth-243577DiVA, id: diva2:1285979
Funder
Swedish Research Council, 638-2013-8993
Note

QC 20190205

Available from: 2019-02-05 Created: 2019-02-05 Last updated: 2019-02-05Bibliographically approved

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