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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

Have Acoustic Oscillations been Detected in the Current Cosmic Microwave Background Data?

ArXiv astro-ph/0111400 (2001)

Authors:

M Douspis, PG Ferreira

Abstract:

The angular power spectrum of the Cosmic Microwave Background has been measured out to sufficiently small angular scale to encompass a few acoustic oscillations. We use a phenomenological fit to the angular power spectrum to quantify the statistical significance of these oscillations and discuss the cosmological implications of such a finding.
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The Trispectrum of the 4 Year COBE-DMR data

(2001)

Authors:

M Kunz, AJ Banday, PG Castro, PG Ferreira, KM Gorski
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The Trispectrum of the 4 Year COBE-DMR data

ArXiv astro-ph/0111250 (2001)

Authors:

M Kunz, AJ Banday, PG Castro, PG Ferreira, KM Gorski

Abstract:

We propose an estimator for the trispectrum of a scalar random field on a sphere, discuss its geometrical and statistical properties, and outline its implementation. By estimating the trispectrum of the 4 year COBE-DMR data (in HEALPix pixelization) we find new evidence of a non-Gaussian signal associated with a known systematic effect. We find that by removing data from the sky maps for those periods of time perturbed by this effect, the amplitudes of the trispectrum coefficients become completely consistent with predictions for a Gaussian sky. These results reinforce the importance of statistical methods based in harmonic space for quantifying non-Gaussianity.
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A High Spatial Resolution Analysis of the MAXIMA-1 Cosmic Microwave Background Anisotropy Data

The Astrophysical Journal American Astronomical Society 561:1 (2001) l1-l5

Authors:

AT Lee, P Ade, A Balbi, J Bock, J Borrill, A Boscaleri, P de Bernardis, PG Ferreira, S Hanany, VV Hristov, AH Jaffe, PD Mauskopf, CB Netterfield, E Pascale, B Rabii, PL Richards, GF Smoot, R Stompor, CD Winant, JHP Wu
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Cosmological Implications of the MAXIMA-1 High-Resolution Cosmic Microwave Background Anisotropy Measurement

The Astrophysical Journal American Astronomical Society 561:1 (2001) l7-l10

Authors:

R Stompor, M Abroe, P Ade, A Balbi, D Barbosa, J Bock, J Borrill, A Boscaleri, P de Bernardis, PG Ferreira, S Hanany, V Hristov, AH Jaffe, AT Lee, E Pascale, B Rabii, PL Richards, GF Smoot, CD Winant, JHP Wu
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