829 citations · 2.8k across the 35 of their papers we have counts for
27 papers · 1 filter
Gravitational Wave Birefringence in generalized Palatini Chern Simons
Jose Perdiguero, Macarena Lagos
The cosmological propagation of gravitational waves (GWs) can exhibit amplitude and phase polarization distortions when parity symmetry is broken, a phenomenon known as cosmologica…
Birefringence tests of gravity with multi-messenger binaries
Macarena Lagos, Leah Jenks, Maximiliano Isi +7
Extensions to General Relativity (GR) allow the polarization of gravitational waves (GW) from astrophysical sources to suffer from amplitude and velocity birefringence, which respe…
Parameterized Parity Violation in Gravitational Wave Propagation
Leah Jenks, Lyla Choi, Macarena Lagos +1
Gravitational parity violation arises in a variety of theories beyond general relativity. Gravitational waves in such theories have their propagation altered, leading to birefringe…
Chiral Gravitational Waves in Palatini Chern-Simons
Felipe Sulantay, Macarena Lagos, Máximo Bañados
We study the parity-breaking higher-curvature gravity theory of Chern-Simons (CS), using the Palatini formulation in which the metric and connection are taken to be independent fie…
Nonlinearities in Black Hole Ringdowns
Keefe Mitman, Macarena Lagos, Leo C. Stein +11
The gravitational wave strain emitted by a perturbed black hole (BH) ringing down is typically modeled analytically using first-order BH perturbation theory. In this Letter we show…
Generation and propagation of nonlinear quasi-normal modes of a Schwarzschild black hole
Macarena Lagos, Lam Hui
In the analysis of a binary black hole coalescence, it is necessary to include gravitational self-interactions in order to describe the transition of the gravitational wave signal…
New Horizons for Fundamental Physics with LISA
K. G. Arun, Enis Belgacem, Robert Benkel +138
The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders about the fundamental theory of nature at play in the extreme gravity regime, where the gravitatio…
Modified gravitational wave propagation with higher modes and its degeneracies with lensing
Jose Maria Ezquiaga, Wayne Hu, Macarena Lagos +2
Low-energy alternatives to General Relativity (GR) generically modify the phase of gravitational waves (GWs) during their propagation. As detector sensitivities increase, it become…
Polarization distortions of lensed gravitational waves
Charles Dalang, Giulia Cusin, Macarena Lagos
In general relativity (GR), gravitational waves (GWs) propagate the well-known plus and cross polarization modes which are the signature of a massless spin-2 field. However, diffra…
Growth of accretion driven scalar hair around Kerr black holes
Jamie Bamber, Katy Clough, Pedro G. Ferreira +2
Scalar fields around compact objects are of interest for scalar-tensor theories of gravity and dark matter models consisting of a massive scalar, e.g. axions. We study the behaviou…
Phase effects from strong gravitational lensing of gravitational waves
Jose María Ezquiaga, Daniel E. Holz, Wayne Hu +2
Assessing the probability that two or more gravitational waves (GWs) are lensed images of the same source requires an understanding of the image properties, including their relativ…
Gravitational couplings in Chameleon models
Macarena Lagos, Hanjue Zhu
We consider cosmological models where dark energy is described by a dynamical field equipped with the Chameleon screening mechanism, which serves to hide its effects in local dense…
Anomalous decay rate of quasinormal modes
Macarena Lagos, Pedro G. Ferreira, Oliver J. Tattersall
The decay timescales of the quasinormal modes of a massive scalar field have an intriguing behavior: they either grow or decay with increasing angular harmonic numbers , depe…
Gravitational wave propagation beyond geometric optics
Giulia Cusin, Macarena Lagos
It is standard practice to study the lensing of gravitational waves (GW) using the geometric optics regime. However, in many astrophysical configurations this regime breaks down as…
Standard Sirens as a novel probe of dark energy
William J. Wolf, Macarena Lagos
Cosmological models with a dynamical dark energy field typically lead to a modified propagation of gravitational waves via an effectively time-varying gravitational coupling …
Curvature Perturbations in the Effective Field Theory of Inflation
Macarena Lagos, Meng-Xiang Lin, Wayne Hu
We discuss the difference between various gauge-invariant quantities typically used in single-field inflation, namely synchronous , comoving , and unitary curvature…
Cosmological Instabilities and the Role of Matter Interactions in Dynamical Dark Energy Models
William J. Wolf, Macarena Lagos
We consider cosmological models with a dynamical dark energy field, and study the presence of three types of commonly found instabilities, namely ghost (when fields have negative k…
On the growth of massive scalar hair around a Schwarzschild black hole
Katy Clough, Pedro G. Ferreira, Macarena Lagos
Through numerical simulations of a minimally coupled massive Klein-Gordon scalar field, we show that it is possible to grow hair on a Schwarzschild black hole if one assumes an ini…
Speed of gravitational waves and black hole hair
Oliver J. Tattersall, Pedro G. Ferreira, Macarena Lagos
The recent detection of GRB 170817A and GW170817 constrains the speed of gravity waves to be that of light, which severely restricts the landscape of modified gravity theorie…
A general theory of linear cosmological perturbations: stability conditions, the quasistatic limit and dynamics
Macarena Lagos, Emilio Bellini, Johannes Noller +2
We analyse cosmological perturbations around a homogeneous and isotropic background for scalar-tensor, vector-tensor and bimetric theories of gravity. Building on previous results,…
General theories of linear gravitational perturbations to a Schwarzschild Black Hole
Oliver J. Tattersall, Pedro G. Ferreira, Macarena Lagos
We use the covariant formulation proposed in Tattersall et al (2017) to analyse the structure of linear perturbations about a spherically symmetric background in different families…
A covariant approach to parameterised cosmological perturbations
Oliver J. Tattersall, Macarena Lagos, Pedro G. Ferreira
We present a covariant formulation for constructing general quadratic actions for cosmological perturbations, invariant under a given set of gauge symmetries for a given field cont…
A general theory of linear cosmological perturbations: bimetric theories
Macarena Lagos, Pedro G. Ferreira
We implement the method developed in [1] to construct the most general parametrised action for linear cosmological perturbations of bimetric theories of gravity. Specifically, we c…
A general theory of linear cosmological perturbations: scalar-tensor and vector-tensor theories
Macarena Lagos, Tessa Baker, Pedro G. Ferreira +1
We present a method for parametrizing linear cosmological perturbations of theories of gravity, around homogeneous and isotropic backgrounds. The method is sufficiently general and…