152 citations · 932 across the 13 of their papers we have counts for
14 papers
Formation of trapped vacuum bubbles during inflation, and consequences for PBH scenarios
Albert Escrivà, Vicente Atal, Jaume Garriga
A class of inflationary scenarios for primordial black hole (PBH) formation include a small barrier in the slope of the potential. There, the inflaton slows down, generating an enh…
Constraining changes in the merger history of (P)BH binaries with the stochastic gravitational wave background
Vicente Atal, Jose J. Blanco-Pillado, Albert Sanglas +1
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 rat…
Probing non-Gaussianities with the high frequency tail of induced gravitational waves
Vicente Atal, Guillem Domènech
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 th…
NANOGrav signal as mergers of Stupendously Large Primordial Black Holes
Vicente Atal, Albert Sanglas, Nikolaos Triantafyllou
We give an explanation for the signal detected by NANOGrav as the stochastic gravitational wave background from binary mergers of primordial "Stupendously Large Black Holes" (SLABs…
LIGO/Virgo black holes and dark matter: The effect of spatial clustering
Vicente Atal, Albert Sanglas, Nikolaos Triantafyllou
We discuss the effect of clustering for the determination of the merger rate of binary black holes in the LIGO mass range. While for a Poissonian initial distribution, and assuming…
PBH in single field inflation: the effect of shape dispersion and non-Gaussianities
Vicente Atal, Judith Cid, Albert Escrivà +1
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 t…
Primordial black hole formation with non-Gaussian curvature perturbations
Vicente Atal, Jaume Garriga, Airam Marcos-Caballero
In the context of transient constant-roll inflation near a local maximum, we derive the non-perturbative field redefinition that relates a Gaussian random field with the true non-G…
The role of non-gaussianities in Primordial Black Hole formation
Vicente Atal, Cristiano Germani
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…
On the viability of m**2 phi**2 and natural inflation
Ana Achucarro, Vicente Atal, Yvette Welling
In the context of single field inflation, models with a quadratic potential and models with a natural potential with subplanckian decay constant are in tension with the Planck data…
Inflation with moderately sharp features in the speed of sound: GSR and in-in formalism for power spectrum and bispectrum
Ana Achucarro, Vicente Atal, Bin Hu +2
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, an…
Localized correlated features in the CMB power spectrum and primordial bispectrum from a transient reduction in the speed of sound
Ana Achucarro, Vicente Atal, Pablo Ortiz +1
The first year of observations by the Planck satellite mission shows that the cosmic microwave background (CMB) fluctuations are consistent with gaussian statistics in the primordi…
Heavy fields, reduced speeds of sound and decoupling during inflation
Ana Achucarro, Vicente Atal, Sebastian Cespedes +3
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…
On the importance of heavy fields during inflation
Sebastian Cespedes, Vicente Atal, Gonzalo A. Palma
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 ef…
Bigravitational inflation
Vicente Atal, Luis E. Campusano, Gonzalo A. Palma
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 str…