Zobrazeno 1 - 10
of 68
pro vyhledávání: '"Boubekeur, Lotfi"'
Autor:
Boubekeur, Lotfi, Profumo, Stefano
General classical arguments on the time evolution of the phase-space density can be used to derive constraints on the mass of particle candidates for the cosmological dark matter (DM). The resulting Tremaine-Gunn limit is extremely useful in constrai
Externí odkaz:
http://arxiv.org/abs/2302.10246
Publikováno v:
Phys. Rev. D 95, 123534 (2017)
Current measurements of the temperature and polarization anisotropy power spectra of the Cosmic Microwave Background (CMB) seem to indicate that the naive expectation for the slow-roll hierarchy within the most simple inflationary paradigm may not be
Externí odkaz:
http://arxiv.org/abs/1701.08977
Publikováno v:
Phys. Dark Univ. 17 (2017) 38-45
We extend an alternative, phenomenological approach to inflation by means of an equation of state and a sound speed, both of them functions of the number of $e$-folds and four phenomenological parameters. This approach captures a number of possible i
Externí odkaz:
http://arxiv.org/abs/1606.00842
The value of the tensor-to-scalar ratio $r$ in the region allowed by the latest $Planck$ 2015 measurements can be associated to a large variety of inflationary models. We discuss here the potential of future Cosmic Microwave Background cosmological o
Externí odkaz:
http://arxiv.org/abs/1509.05419
Publikováno v:
Phys. Rev. D 91, 103004 (2015)
We examine the impact of a non-minimal coupling of the inflaton to the Ricci scalar, $\frac12 \xi R\phi^2$, on the inflationary predictions. Such a non-minimal coupling is expected to be present in the inflaton Lagrangian on fairly general grounds. A
Externí odkaz:
http://arxiv.org/abs/1502.05193
Publikováno v:
Phys. Rev. D 91, 083006 (2015)
In this work, we analyze two possible alternative and model-independent approaches to describe the inflationary period. The first one assumes a general equation of state during inflation due to Mukhanov, while the second one is based on the slow-roll
Externí odkaz:
http://arxiv.org/abs/1411.7237
Publikováno v:
Phys. Rev. D 90, 103512 (2014)
We revisit the cosmological viability of the Hu $\&$ Sawicki modified gravity scenario. The impact of such a modification on the different cosmological observables, including gravitational waves, is carefully described. The most recent cosmological d
Externí odkaz:
http://arxiv.org/abs/1407.6837
Publikováno v:
Phys. Rev. D 90, 063007 (2014)
Inflation is the leading theory to describe elegantly the initial conditions that led to structure formation in our universe. In this paper, we present a novel phenomenological fit to the Planck, WMAP polarisation (WP) and the BICEP2 datasets using a
Externí odkaz:
http://arxiv.org/abs/1405.7188
Autor:
Boubekeur, Lotfi
Effective field theory is a powerful organizing principle that allows to describe physics below a certain scale model-independently. Above that energy scale, identified with the cutoff, the EFT description breaks down and new physics is expected to a
Externí odkaz:
http://arxiv.org/abs/1312.4768
Autor:
Boubekeur, Lotfi
Tensor modes in the cosmic microwave background are one of the most robust signatures of inflation. We derive theoretical bounds on the tensor fraction, as a generalization of the well-known Lyth bound. Under reasonable assumptions, the new bounds ar
Externí odkaz:
http://arxiv.org/abs/1208.0210