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Constraints on kinetically modified inflation from WMAP5

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Lorenz, Larissa [Université Pierre et Marie Curie] Martin, Jérôme [Université Pierre et Marie Curie] Ringeval, Christophe [UCL]

Single field inflationary models with a nonminimal kinetic term (also called k-inflationary models) can be characterized by the so-called sound flow functions, which complete the usual Hubble flow hierarchy. These parameters appear in the primordial power spectra of cosmological perturbations at leading order and, therefore, affect the resulting cosmic microwave background anisotropies. Using the fifth year Wilkinson Microwave Anisotropy Probe (WMAP5) data, we derive the marginalized posterior probability distributions for both the sound and Hubble flow parameters. In contrast to the standard situation, these parameters remain separately unbounded, and notably there is no longer any upper limit on ϵ1, the first Hubble flow function. Only special combinations of these parameters, corresponding to the spectral index and tensor-to-scalar ratio observables, are actually constrained by the data. The energy scale of k-inflation is nevertheless limited from above to Hinf≤6×10-6mPl at two-sigma level. Moreover, for the subclass of Dirac-Born-Infeld models, by considering the non-Gaussianity bounds on the sound speed, we find a weak limit ϵ1<0.08 at 95% confidence level.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2008
Language Anglais
Journal information "Physical Review. D, Particles, Fields, Gravitation and Cosmology" - Vol. 78, no. 6, p. 063543 [7 pages] (2008)
Peer reviewed yes
Publisher American Physical Society ((United States) [S.l.])
issn 1550-7998
Publication status Publié
Affiliations Université Pierre et Marie Curie - Institut d’Astrophysique de Paris
UCL - SC/PHYS - Département de physique
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Bibliographic reference Lorenz, Larissa ; Martin, Jérôme ; Ringeval, Christophe. Constraints on kinetically modified inflation from WMAP5. In: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 78, no. 6, p. 063543 [7 pages] (2008)
Permanent URL http://hdl.handle.net/2078.1/71698