43 citations · 84 across the 19 of their papers we have counts for
19 papers
Thermal Origin of Black Hole Quasinormal Modes
D. Giataganas, G. F. Giudice, A. Kehagias +2
When a black hole rings after a merger, it emits gravitational waves at characteristic frequencies known as quasinormal modes (QNMs). In the eikonal limit, these modes are governed…
Hunting Dark Matter with the Einstein Telescope
A. J. Iovino, M. Maggiore, N. Muttoni +1
Too light primordial black holes evaporate and are therefore strongly constrained by various bounds, e.g. Cosmic Microwave Background distortion. However, if they are formed strong…
Black Hole Mergers as the Fastest Photon Ring Scramblers
D. Giataganas, G. F. Giudice, A. Ianniccari +5
Black holes are the most efficient scramblers in nature. By mapping the instantaneous mass and angular momentum of two spinless black holes in a quasi-circular binary onto those of…
Dark Matter from Eternity
G. Franciolini, M. Peloso, A. Riotto
We propose that the totality of dark matter in the universe might ascribe its origin to one of the key properties of cosmological inflation, that it may be eternal: regions that at…
Standard Model Higgs Peaks: a Note on the Vacuum Instability during Inflation
G. Franciolini, A. Kehagias, A. Riotto
In the Standard Model, the Higgs potential develops an instability at high field values when the quartic self-coupling runs negative. Large quantum fluctuations during cosmic infla…
Uncovering the population of compact binary mergers and their formation pathways with gravitational waves through the Einstein Telescope
M. Arca-Sedda, I. Dvorkin, G. Franciolini +19
Ground-based gravitational-wave (GW) observatories have transformed our view of compact-object mergers, yet their reach still limits a comprehensive reconstruction of the processes…
Nonlinear Gravity and Multipole Turbulence
A. Ianniccari, A. Kehagias, L. Lo Bianco +1
We derive a kinetic Boltzmann equation characterizing the long-term statistical behavior of the turbulent dynamics of nonlinear interacting gravitational wave multipoles in Minkows…
Non-vanishing non-linear Static Love Number of a Class of Extremal Reissner-Nordstrom Black Holes
L. R. Gounis, A. Kehagias, G. Panagopoulos +1
We compute the tidal Love numbers for a particular axially symmetric configuration of extremal Reissner-Nordstrom geometry. By exactly solving the non-linear Einstein equations, we…
Are Primordial Black Holes Truly Fine-Tuned?
A. J. Iovino, A. Riotto
Single-field inflationary models which generate primordial black holes through the enhancement of the curvature primordial power at small scales are commonly criticized and frequen…
The Irrelevance of Primordial Black Hole Clustering in the LVK mass range
F. Crescimbeni, V. Desjacques, G. Franciolini +6
We show that in realistic models where primordial black holes are formed due to the collapse of sizeable inflationary perturbations, their initial spatial clustering beyond Poisson…
The Vanishing of the Non-linear Static Love Number of Kerr Black Holes and the Role of Symmetries
L. -R. Gounis, A. Kehagias, A. Riotto
We investigate the tidal response of Kerr black holes in four-dimensional space-times subjected to external gravitational fields. Using the Ernst formalism and Weyl coordinates, we…
How Well Do We Know the Scalar-Induced Gravitational Waves?
A. J. Iovino, S. Matarrese, G. Perna +2
Gravitational waves sourced by amplified scalar perturbations are a common prediction across a wide range of cosmological models. These scalar curvature fluctuations are inherently…
Can We Detect Deviations from Einstein's Gravity in Black Hole Ringdowns?
A. Kehagias, A. Riotto
The quasinormal mode spectrum of gravitational waves emitted during the black hole ringdown relaxation phase, following the merger of a black hole binary, is a crucial target of gr…
Nonlinear Effects in Black Hole Ringdown Made Simple: Quasi-Normal Modes as Adiabatic Modes
A. Kehagias, A. Riotto
The nonlinear nature of general relativity manifests prominently throughout the merger of two black holes, from the inspiral phase to the final ringdown. Notably, the quasi-normal…
Deciphering the Instability of the Black Hole Ringdown Quasinormal Spectrum
A. Ianniccari, A. J. Iovino, A. Kehagias +4
The spectrum of the quasinormal modes of the gravitational waves emitted during the ringdown phase following the merger of two black holes is of primary importance in gravitational…
Quasinormal Modes and Universality of the Penrose Limit of Black Hole Photon Rings
D. Giataganas, A. Kehagias, A. Riotto
We study the physics of photon rings in a wide range of axisymmetric black holes admitting a separable Hamilton-Jacobi equation for the geodesics. Utilizing the Killing-Yano tensor…
Towards a Gravity Dual for the Large Scale Structure of the Universe
A. Kehagias, A. Riotto, M. S. Sloth
The dynamics of the large-scale structure of the universe enjoys at all scales, even in the highly non-linear regime, a Lifshitz symmetry during the matter-dominated period. In thi…
A Consistency Relation for the Observed Galaxy Bispectrum and the Local non-Gaussianity from Relativistic Corrections
A. Kehagias, A. Moradinezhad Dizgah, J. Noreña +2
We obtain a consistency relation for the observed three-point correlator of galaxies. It includes relativistic effects and it is valid in the squeezed limit. Furthermore, the consi…
A Consistency Relation for the CMB B-mode Polarization in the Squeezed Limit
A. Kehagias, A. Moradinezhad-Dizgah, J. Noreña +2
A large-scale temperature perturbation has a non-zero correlation with the power spectrum of B-modes of cosmological origin on short scales while the corresponding correlation is e…