162 citations · 1.7k across the 40 of their papers we have counts for
40 papers
Scalar-induced gravitational wave interpretation of PTA data: the role of scalar fluctuation propagation speed
Shyam Balaji, Guillem Domènech, Gabriele Franciolini
Pulsar timing arrays gathered evidence of the presence of a gravitational wave background around nHz frequencies. If the gravitational wave background was induced by large and Gaus…
Lectures on Gravitational Wave Signatures of Primordial Black Holes
Guillem Domènech
We provide a pedagogical approach to gravitational waves in cosmology with focus on gravitational wave signals related to primordial black holes. These lectures notes contain more…
Gravitational waves induced by scalar-tensor mixing
Pritha Bari, Nicola Bartolo, Guillem Domènech +1
This paper explores the physics of second-order gravitational waves (GWs) induced by scalar-tensor perturbation interactions in the radiation-dominated Universe. We investigate the…
Disformal symmetry in the Universe: mimetic gravity and beyond
Guillem Domènech, Alexander Ganz
Symmetries play an important role in fundamental physics. In gravity and field theories, particular attention has been paid to Weyl (or conformal) symmetry. However, once the theor…
Halo Formation from Yukawa Forces in the Very Early Universe
Guillem Domènech, Derek Inman, Alexander Kusenko +1
If long-range attractive forces exist and are stronger than gravity then cosmic halo formation can begin in the radiation-dominated era. We study a simple realization of this effec…
Gravitational wave hints black hole remnants as dark matter
Guillem Domènech, Misao Sasaki
The end state of Hawking evaporation of a black hole is uncertain. Some candidate quantum gravity theories, such as loop quantum gravity and asymptotic safe gravity, hint towards P…
New universal property of cosmological gravitational wave anisotropies
Ameek Malhotra, Ema Dimastrogiovanni, Guillem Domènech +2
The anisotropies of the stochastic gravitational wave background, as produced in the early phases of cosmological evolution, can act as a key probe of the primordial universe parti…
Galaxy number-count dipole and superhorizon fluctuations
Guillem Domènech, Roya Mohayaee, Subodh P. Patil +1
In view of the growing tension between the dipole anisotropy of number counts of cosmologically distant sources and of the cosmic microwave background (CMB), we investigate the num…
Induced gravitational waves from slow-roll inflation after an enhancing phase
Shyam Balaji, Guillem Domenech, Joseph Silk
The primordial spectrum of fluctuations may present a large peak as a result of enhancing features during inflation. This may include, but is not limited to, bumps in the inflaton'…
Expansion history-dependent oscillations in the scalar-induced gravitational wave background
Lukas T. Witkowski, Guillem Domènech, Jacopo Fumagalli +1
Oscillations in the frequency profile of the scalar-induced contribution to the stochastic gravitational wave background are a characteristic signal for small-scale features during…
Exploring Evaporating Primordial Black Holes with Gravitational Waves
Guillem Domènech, Volodymyr Takhistov, Misao Sasaki
Primordial black holes (PBHs) from the early Universe have been connected with the nature of dark matter and can significantly affect cosmological history. We show that coincidence…
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…
Approximate gauge independence of the induced gravitational wave spectrum
Guillem Domènech, Misao Sasaki
Gravitational waves (GWs) induced by scalar curvature fluctuations are an important source of the cosmological GW background and a crucial counterpart of the primordial black hole…
Gravitational wave constraints on the primordial black hole dominated early universe
Guillem Domènech, Chunshan Lin, Misao Sasaki
We calculate the gravitational waves (GWs) induced by the density fluctuations due to inhomogeneous distribution of primordial black holes (PBHs) in the case where PBHs eventually…
NANOGrav Hints on Planet-Mass Primordial Black Holes
Guillem Domènech, Shi Pi
Recently, the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) claimed the detection of a stochastic common-spectrum process of the pulsar timing array (PTA)…
Neutrino masses, vacuum stability and quantum gravity prediction for the mass of the top quark
Guillem Domènech, Mark Goodsell, Christof Wetterich
A general prediction from asymptotically safe quantum gravity is the approximate vanishing of all quartic scalar couplings at the UV fixed point beyond the Planck scale. A vanishin…
Induced gravitational waves as a probe of thermal history of the universe
Guillem Domènech, Shi Pi, Misao Sasaki
The scalar perturbation induced gravitational waves are a probe of the primordial density perturbation spectrum on small scales. In this paper, we show that they can also probe the…
Planck residuals anomaly as a fingerprint of alternative scenarios to inflation
Guillem Domènech, Xingang Chen, Marc Kamionkowski +1
Planck's residuals of the CMB temperature power spectrum present a curious oscillatory shape that resembles an extra smoothing effect of lensing and is the source of the lensing an…
Could the black hole singularity be a field singularity?
Guillem Domènech, Atsushi Naruko, Misao Sasaki +1
In the wake of interest to find black hole solutions with scalar hair, we investigate the effects of disformal transformations on static spherically symmetric space-times with a no…
Induced gravitational waves in a general cosmological background
Guillem Domènech
Gravitational waves are inevitably produced by second order terms in cosmological perturbation theory. Most notably, the so-called induced gravitational waves are a window to the s…
Lensing anomaly and oscillations in the primordial power spectrum
Guillem Domènech, Marc Kamionkowski
The latest analysis of the cosmic microwave background by the Planck team finds more smoothing of the acoustic peaks in the temperature power spectrum than predicted by CDM. Her…
Mimicking alternatives to inflation with interacting spectator fields
Guillem Domènech, Javier Rubio, Julius Wons
It has been argued that oscillatory features from spectator fields in the primordial power spectrum could be a probe of alternatives to inflation. In this work, we soften this clai…
Gravitational waves from global cosmic strings in quintessential inflation
Dario Bettoni, Guillem Domènech, Javier Rubio
The combination of non-minimal couplings to gravity with the post-inflationary kinetic-dominated era typically appearing in quintessential inflation scenarios may lead to the spont…
Vacuum birefringence and the Schwinger effect in (3+1) de Sitter
Mariona Banyeres, Guillem Domènech, Jaume Garriga
In de Sitter space, the current induced by an electric field in vacuum is known to feature certain peculiarities, such as infrared hyperconductivity for light bosons in weak electr…