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Planck 2015 results: XIV. Dark energy and modified gravity

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dc.contributor.author Ade P.
dc.contributor.author Aghanim N.
dc.contributor.author Arnaud M.
dc.contributor.author Ashdown M.
dc.contributor.author Aumont J.
dc.contributor.author Baccigalupi C.
dc.contributor.author Banday A.
dc.contributor.author Barreiro R.
dc.contributor.author Bartolo N.
dc.contributor.author Battaner E.
dc.contributor.author Battye R.
dc.contributor.author Benabed K.
dc.contributor.author Benoît A.
dc.contributor.author Benoit-Lévy A.
dc.contributor.author Bernard J.
dc.contributor.author Bersanelli M.
dc.contributor.author Bielewicz P.
dc.contributor.author Bock J.
dc.contributor.author Bonaldi A.
dc.contributor.author Bonavera L.
dc.contributor.author Bond J.
dc.contributor.author Borrill J.
dc.contributor.author Bouchet F.
dc.contributor.author Bucher M.
dc.contributor.author Burigana C.
dc.contributor.author Butler R.
dc.contributor.author Calabrese E.
dc.contributor.author Cardoso J.
dc.contributor.author Catalano A.
dc.contributor.author Challinor A.
dc.contributor.author Chamballu A.
dc.contributor.author Chiang H.
dc.contributor.author Christensen P.
dc.contributor.author Church S.
dc.contributor.author Clements D.
dc.contributor.author Colombi S.
dc.contributor.author Colombo L.
dc.contributor.author Combet C.
dc.contributor.author Couchot F.
dc.contributor.author Coulais A.
dc.contributor.author Crill B.
dc.contributor.author Curto A.
dc.contributor.author Cuttaia F.
dc.contributor.author Danese L.
dc.contributor.author Davies R.
dc.contributor.author Davis R.
dc.contributor.author De Bernardis P.
dc.contributor.author De Rosa A.
dc.contributor.author De Zotti G.
dc.contributor.author Delabrouille J.
dc.contributor.author Désert F.
dc.contributor.author Diego J.
dc.contributor.author Dole H.
dc.contributor.author Donzelli S.
dc.contributor.author Doré O.
dc.contributor.author Douspis M.
dc.contributor.author Ducout A.
dc.contributor.author Dupac X.
dc.contributor.author Efstathiou G.
dc.contributor.author Elsner F.
dc.contributor.author Enßlin T.
dc.contributor.author Eriksen H.
dc.contributor.author Fergusson J.
dc.contributor.author Finelli F.
dc.date.accessioned 2018-09-19T20:05:33Z
dc.date.available 2018-09-19T20:05:33Z
dc.date.issued 2016
dc.identifier.issn 0004-6361
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/142547
dc.description.abstract © ESO, 2016.We study the implications of Planck data for models of dark energy (DE) and modified gravity (MG) beyond the standard cosmological constant scenario. We start with cases where the DE only directly affects the background evolution, considering Taylor expansions of the equation of state w(a), as well as principal component analysis and parameterizations related to the potential of a minimally coupled DE scalar field. When estimating the density of DE at early times, we significantly improve present constraints and find that it has to be below ∼2% (at 95% confidence) of the critical density, even when forced to play a role for z < 50 only. We then move to general parameterizations of the DE or MG perturbations that encompass both effective field theories and the phenomenology of gravitational potentials in MG models. Lastly, we test a range of specific models, such as k-essence, f(R) theories, and coupled DE. In addition to the latest Planck data, for our main analyses, we use background constraints from baryonic acoustic oscillations, type-Ia supernovae, and local measurements of the Hubble constant. We further show the impact of measurements of the cosmological perturbations, such as redshift-space distortions and weak gravitational lensing. These additional probes are important tools for testing MG models and for breaking degeneracies that are still present in the combination of Planck and background data sets. All results that include only background parameterizations (expansion of the equation of state, early DE, general potentials in minimally-coupled scalar fields or principal component analysis) are in agreement with ΛCDM. When testing models that also change perturbations (even when the background is fixed to ΛCDM), some tensions appear in a few scenarios: the maximum one found is ∼2σ for Planck TT+lowP when parameterizing observables related to the gravitational potentials with a chosen time dependence; the tension increases to, at most, 3σ when external data sets are included. It however disappears when including CMB lensing.
dc.relation.ispartofseries Astronomy and Astrophysics
dc.subject Cosmic background radiation
dc.subject Cosmology: theory
dc.subject Dark energy
dc.subject Gravitation
dc.title Planck 2015 results: XIV. Dark energy and modified gravity
dc.type Article
dc.relation.ispartofseries-volume 594
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS00046361-2016-594-SID84990862292


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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