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Professor Pedro Ferreira

Professor of Astrophysics

Sub department

  • Astrophysics

Research groups

  • Beecroft Institute for Particle Astrophysics and Cosmology
  • Rubin-LSST
pedro.ferreira@physics.ox.ac.uk
Telephone: 01865 (2)73366
Denys Wilkinson Building, room 757
Personal Webpage
  • About
  • Publications

Strong Constraints on Cosmological Gravity from GW170817 and GRB 170817A.

Physical review letters 119:25 (2017) 251301-251301

Authors:

T Baker, E Bellini, PG Ferreira, M Lagos, J Noller, I Sawicki

Abstract:

The detection of an electromagnetic counterpart (GRB 170817A) to the gravitational-wave signal (GW170817) from the merger of two neutron stars opens a completely new arena for testing theories of gravity. We show that this measurement allows us to place stringent constraints on general scalar-tensor and vector-tensor theories, while allowing us to place an independent bound on the graviton mass in bimetric theories of gravity. These constraints severely reduce the viable range of cosmological models that have been proposed as alternatives to general relativistic cosmology.
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Noise angular power spectrum of gravitational wave background experiments

Physical Review D American Physical Society 101:12 (2020) 124048

Authors:

David Alonso, Carlo R Contaldi, Giulia Cusin, Pedro Ferreira, Arianna I Renzini

Abstract:

We construct a model for the angular power spectrum of the instrumental noise in interferometer networks mapping gravitational wave backgrounds (GWBs) as a function of detector noise properties, network configuration, and scan strategy. We use the model to calculate the noise power spectrum for current and future ground-based experiments, as well as for planned space missions. We present our results in a language similar to that used in cosmic microwave background and intensity mapping experiments, and connect the formalism with the sensitivity curves that are common lore in GWB analyses.
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Galaxy morphology rules out astrophysically relevant Hu-Sawicki f (R) gravity

PHYSICAL REVIEW D American Physical Society (APS) 102:10 (2020) ARTN 104060

Authors:

Harry Desmond, Pedro G Ferreira
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Growth of massive scalar hair around a Schwarzschild black hole

Physical Review D American Physical Society 100 (2019) 063014

Authors:

Katherine Clough, PG Ferreira, M Lagos
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Black hole merger simulations in wave dark matter environments

Physical Review D 107:2 (2023)

Authors:

J Bamber, JC Aurrekoetxea, K Clough, PG Ferreira

Abstract:

The interaction of binary black hole mergers with their environments can be studied using numerical relativity simulations. These start only a short finite time before merger, at which point appropriate initial conditions must be imposed. A key task is therefore to identify the configuration that is appropriate for the binary and its environment at this stage of the evolution. In this work we study the behavior of wave dark matter around equal mass black hole binaries, finding that there is a preferred, quasistationary profile that persists and grows over multiple orbits, in contrast to heavier mass dark matter where any overdensity tends to be dispersed by the binary motion. While different initial configurations converge to the preferred quasistationary one after several orbits, unwanted transient oscillations are generated in the process, which may have an impact on the signal in short simulation runs. We also point out that naively superimposing the matter onto a circular binary results in artificially eccentric orbits due to the matter backreaction, which is an effect of the initial conditions and not a signature of dark matter. We discuss the further work required so that comparison of waveforms obtained with environments to vacuum cases can be done in a meaningful way.
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