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Black Hole

Lensing of space time around a black hole. At Oxford we study black holes observationally and theoretically on all size and time scales - it is some of our core work.

Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES.

Professor Pedro Ferreira

Professor of Astrophysics

Research theme

  • Particle astrophysics & cosmology

Sub department

  • Astrophysics

Research groups

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

Inflation in a scale invariant universe

(2018)

Authors:

Pedro G Ferreira, Christopher T Hill, Johannes Noller, Graham G Ross
More details from the publisher

The effects of death and post-mortem cold ischemia on human tissue transcriptomes

Nature Communications Springer Nature 9:1 (2018) 490

Authors:

Pedro G Ferreira, Manuel Muñoz-Aguirre, Ferran Reverter, Caio P Sá Godinho, Abel Sousa, Alicia Amadoz, Reza Sodaei, Marta R Hidalgo, Dmitri Pervouchine, Jose Carbonell-Caballero, Ramil Nurtdinov, Alessandra Breschi, Raziel Amador, Patrícia Oliveira, Cankut Çubuk, João Curado, François Aguet, Carla Oliveira, Joaquin Dopazo, Michael Sammeth, Kristin G Ardlie, Roderic Guigó
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Emergent Dark Energy from Dark Matter

(2018)

Authors:

Takeshi Kobayashi, Pedro G Ferreira
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The impact of relativistic effects on cosmological parameter estimation

Physical Review D American Physical Society 97:2 (2018) 1-14

Authors:

Christiane Lorenz, David Alonso, Pedro Ferreira

Abstract:

Future surveys will access large volumes of space and hence very long wavelength fluctuations of the matter density and gravitational field. It has been argued that the set of secondary effects that affect the galaxy distribution, relativistic in nature, will bring new, complementary cosmological constraints. We study this claim in detail by focusing on a subset of wide-area future surveys: Stage-4 cosmic microwave background experiments and photometric redshift surveys. In particular, we look at the magnification lensing contribution to galaxy clustering and general relativistic corrections to all observables. We quantify the amount of information encoded in these effects in terms of the tightening of the final cosmological constraints as well as the potential bias in inferred parameters associated with neglecting them. We do so for a wide range of cosmological parameters, covering neutrino masses, standard dark-energy parametrizations and scalar-tensor gravity theories. Our results show that, while the effect of lensing magnification to number counts does not contain a significant amount of information when galaxy clustering is combined with cosmic shear measurements, this contribution does play a significant role in biasing estimates on a host of parameter families if unaccounted for. Since the amplitude of the magnification term is controlled by the slope of the source number counts with apparent magnitude, $s(z)$, we also estimate the accuracy to which this quantity must be known to avoid systematic parameter biases, finding that future surveys will need to determine $s(z)$ to the $\sim$5-10\% level. On the contrary, large-scale general-relativistic corrections are irrelevant both in terms of information content and parameter bias for most cosmological parameters, but significant for the level of primordial non-Gaussianity.
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Inertial Spontaneous Symmetry Breaking and Quantum Scale Invariance

(2018)

Authors:

Pedro G Ferreira, Christopher T Hill, Graham G Ross
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