Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Vicente Atal"'
Black holes binaries coming from a distribution of primordial black holes might exhibit a large merger rate up to large redshifts. Using a phenomenological model for the merger rate, we show that changes in its slope, up to redshifts $z\sim 4$, are c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8756e27293b3ae2077d10b7952ede209
Autor:
Guillem Domènech, Vicente Atal
We investigate in detail the spectrum of gravitational waves induced by a peaked primordial curvature power spectrum generated in single field inflationary models. We argue that the $f_{\rm NL}$ parameter can be inferred by measuring the high frequen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0dcb77030077e0b63cf33b65a30ee771
http://arxiv.org/abs/2103.01056
http://arxiv.org/abs/2103.01056
Publikováno v:
Dipòsit Digital de la UB
Universidad de Barcelona
Universidad de Barcelona
Primordial black holes (PBHs) may result from high peaks in a random field of cosmological perturbations. In single field inflationary models, such perturbations can be seeded as the inflaton overshoots a small barrier on its way down the potential.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d2bdcb2c9488134e7205a50bdc4ee883
http://hdl.handle.net/2445/172614
http://hdl.handle.net/2445/172614
Autor:
Vicente Atal, Cristiano Germani
Publikováno v:
Dipòsit Digital de la UB
Universidad de Barcelona
Universidad de Barcelona
We re-analyse current single-field inflationary models related to primordial black holes formation. We do so by taking into account recent developments on the estimations of their abundances and the influence of non-gaussianities. We show that, for a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a1caed3604d37a15abcac175aae71876
http://hdl.handle.net/2445/157277
http://hdl.handle.net/2445/157277
Publikováno v:
Journal of Cosmology and Astroparticle Physics
Journal of Cosmology and Astroparticle Physics, 2017(February), 013
Journal of Cosmology and Astroparticle Physics, 2017(February), 013
In multi-field inflation one or more non-adiabatic modes may become light, potentially inducing large levels of isocurvature perturbations in the cosmic microwave background. If in addition these light modes are coupled to the adiabatic mode, they in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::438ccb7f418467a439287cb3391e122b
The simplest two-field completion of natural inflation has a regime in which both fields are active and in which its predictions are within the Planck 1-$\sigma$ confidence contour. We show this for the original model of natural inflation, in which i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::23cce4a1228b60a671b33cdd1992e945
http://hdl.handle.net/1887/3197245
http://hdl.handle.net/1887/3197245
Publikováno v:
Physical Review D, 90, 023511
We continue the study of mild transient reductions in the speed of sound of the adiabatic mode during inflation, of their effect on the primordial power spectrum and bispectrum, and of their detectability in the cosmic microwave background (CMB). We
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::84b6c25b4c01af4fa79cc8a939619fb5
https://hdl.handle.net/1887/54618
https://hdl.handle.net/1887/54618
Autor:
Subodh P. Patil, Vicente Atal, Ana Achúcarro, Sebastian Cespedes, Gonzalo A. Palma, Jinn Ouk Gong
Publikováno v:
Physical Review D, 86(12), 121301
We discuss and clarify the validity of effective single field theories of inflation obtained by integrating out heavy degrees of freedom in the regime where adiabatic perturbations propagate with a suppressed speed of sound. We show by construction t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b0316ef4c7020f8f9e50dc8e43bc3c88
http://hdl.handle.net/1887/60005
http://hdl.handle.net/1887/60005
Publikováno v:
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
We study the dynamics of two-field models of inflation characterized by a hierarchy of masses between curvature and isocurvature modes. When the hierarchy is large, a low energy effective field theory (EFT) exists in which only curvature modes partic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aebc3d8b907a54058e933016fbd08005
Publikováno v:
PHYSICAL REVIEW D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
We study the realization of cosmic inflation in bigravity theories. By analyzing the evolution of scalar, vector, and tensor perturbations in de Sitter-like spacetimes, we find strong stability constraints on the class of viable vacua offered by thes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cac98d5712ff010a8cc039b80665618e