80 citations · 818 across the 38 of their papers we have counts for
39 papers
The Love for Three Logarithms: Universal Running of Dynamical Love Numbers
Sebastian Garcia-Saenz
The static tidal Love numbers of black holes vanish in general relativity (GR), but are generically non-zero, and in fact 'run' logarithmically with scale, in more general theories…
Geodesic completeness of anisotropic cosmologies and the null energy condition
Sebastian Garcia-Saenz, Junjie Hua, Abbas M. Sherif
We demonstrate that a Bianchi-I spacetime in general relativity must be geodesically past-incomplete under the assumption of the null energy condition and provided there exists a t…
No-go theorem for spontaneous vectorization
Hsu-Wen Chiang, Sebastian Garcia-Saenz, Aofei Sang
Generalized vector-tensor theories of gravity have drawn attention for admitting hairy black hole solutions, thereby circumventing the standard no-hair theorems. It remains an open…
On the logarithmic Love number of black holes beyond general relativity
Sebastian Garcia-Saenz, Hongbo Lin
Tidal Love numbers and other response coefficients of black holes sometimes exhibit a logarithmic dependence on scale, or 'running'. We clarify that this coefficient is directly ca…
Cosmological tensions in Proca-Nuevo theory
Hsu-Wen Chiang, Claudia de Rham, Sebastian Garcia-Saenz +1
We study the cosmological predictions of (extended) Proca-Nuevo theory. This vector-tensor theory enjoys stable homogeneous and isotropic solutions characterized by an effective da…
Cosmology in warped massive gravity
Sebastian Garcia-Saenz, Yuxiang Wei, Xue Zhou
We study the cosmological dynamics and predictions in the theory of warped massive gravity. This set-up postulates a five-dimensional ghost-free massive graviton with a brane-local…
Black hole destabilization via trapped quasi-normal modes
Hsu-Wen Chiang, Sebastian Garcia-Saenz, Aofei Sang
In the presence of non-minimal gravitational couplings, matter field perturbations on a static black hole spacetime may develop unphysical poles in their linearized equations. Phys…
Loops in inflation with strongly non-geodesic motion
Sebastian Garcia-Saenz, Yizhou Lu, Sébastien Renaux-Petel
We study loop corrections in the effective field theory of inflation with imaginary speed of sound, which has been shown to provide an effective description of multi-field inflatio…
Hairless Black Hole by Superradiance
Sebastian Garcia-Saenz, Guangzhou Guo, Peng Wang +1
We investigate the interplaying effects of black hole scalarization and superradiance in the context of the Einstein-Maxwell-scalar model, with the scalar field possessing electric…
Stable long-term evolution in numerical relativity
Sebastian Garcia-Saenz, Guangzhou Guo, Peng Wang +1
We report on the potential occurrence of a numerical instability in the long-time simulation of black holes using the Baumgarte-Shapiro-Shibata-Nakamura formulation of numerical re…
Black hole accretion of scalar clouds with spontaneous symmetry breaking
Sebastian Garcia-Saenz, Guangzhou Guo, Peng Wang +1
Spontaneous scalarization of black holes typically occurs through the condensation of a scalar field, with the field evolving from a -symmetric phase into a symmetry-breaking…
Cubic interactions for massless and partially massless spin-1 and spin-2 fields
Nicolas Boulanger, Sebastian Garcia-Saenz, Songsong Pan +1
We perform a complete classification of the consistent two-derivative cubic couplings for a system containing an arbitrary number of massless spin-1, massless spin-2, and partially…
Geodesic completeness, cosmological bounces and inflation
Sebastian Garcia-Saenz, Junjie Hua, Yunke Zhao
The question of geodesic completeness of cosmological spacetimes has recently received renewed scrutiny. A particularly interesting result is the observation that the well-known Bo…
Scalar-Induced Gravitational Waves from Ghost Inflation and Parity Violation
Sebastian Garcia-Saenz, Yizhou Lu, Zhiming Shuai
We calculate the scalar-induced gravitational wave energy density in the theory of Ghost Inflation, assuming scale invariance and taking into account both the power spectrum- and t…
To Half--Be or Not To Be?
Claudia de Rham, Sebastian Garcia-Saenz, Lavinia Heisenberg +2
It has recently been argued that half degrees of freedom could emerge in Lorentz and parity invariant field theories, using a non-linear Proca field theory dubbed Proca-Nuevo as a…
No-go Theorem for Scalar-Trispectrum-Induced Gravitational Waves
Sebastian Garcia-Saenz, Lucas Pinol, Sébastien Renaux-Petel +1
We show that the contribution of the primordial trispectrum to the energy density of the scalar-induced stochastic gravitational wave background cannot exceed the one from the scal…
Schwarzschild quasi-normal modes of non-minimally coupled vector fields
Sebastian Garcia-Saenz, Aaron Held, Jun Zhang
We study perturbations of massive and massless vector fields on a Schwarzschild black-hole background, including a non-minimal coupling between the vector field and the curvature.…
Cosmology of Extended Proca-Nuevo
Claudia de Rham, Sebastian Garcia-Saenz, Lavinia Heisenberg +1
Proca-Nuevo is a non-linear theory of a massive spin-1 field which enjoys a non-linearly realized constraint that distinguishes it among other generalized vector models. We show th…
On the Coupling of Generalized Proca Fields to Degenerate Scalar-Tensor Theories
Sebastian Garcia-Saenz
We prove that vector fields described by the generalized Proca class of theories do not admit a consistent coupling to a gravitational sector defined by a scalar-tensor theory of t…
Destabilization of black holes and stars by generalized Proca fields
Sebastian Garcia-Saenz, Aaron Held, Jun Zhang
We demonstrate that black holes and stars in general relativity can be destabilized by perturbations of non-minimally coupled vector fields. Focusing on static and spherically symm…
Supersymmetric Partially Massless Fields and Non-Unitary Superconformal Representations
Noah Bittermann, Sebastian Garcia-Saenz, Kurt Hinterbichler +1
We find and classify the simplest SUSY multiplets on AdS which contain partially massless fields. We do this by studying representations of the , …
Degeneracy, matter coupling, and disformal transformations in scalar-tensor theories
Cédric Deffayet, Sebastian Garcia-Saenz
Degenerate scalar-tensor theories of gravity extend general relativity by a single degree of freedom, despite their equations of motion being higher than second order. In some case…
Revisiting non-Gaussianity in multifield inflation with curved field space
Sebastian Garcia-Saenz, Lucas Pinol, Sébastien Renaux-Petel
Recent studies of inflation with multiple scalar fields have highlighted the importance of non-canonical kinetic terms in novel types of inflationary solutions. This motivates a th…
A theory for multiple partially massless spin-2 fields
Nicolas Boulanger, Cédric Deffayet, Sebastian Garcia-Saenz +1
We revisit the problem of building consistent interactions for a multiplet of partially massless spin-2 fields in (anti-)de Sitter space. After rederiving and strengthening the exi…