Beecroft Institute for Particle Astrophysics and Cosmology

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Tests for Gaussianity of the MAXIMA-1 CMB Map

(2001)

Authors:

JHP Wu, A Balbi, J Borrill, PG Ferreira, S Hanany, AH Jaffe, AT Lee, B Rabii, PL Richards, GF Smoot, R Stompor, CD Winant
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Isotropy and Stability of the Brane

(2001)

Authors:

MG Santos, F Vernizzi, PG Ferreira
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Isotropy and Stability of the Brane

ArXiv hep-ph/0103112 (2001)

Authors:

MG Santos, F Vernizzi, PG Ferreira

Abstract:

We reexamine Wald's no-hair theorem for global anisotropy in the brane world scenarios. We derive a set of sufficient conditions which must be satisfied by the brane matter and bulk metric so that a homogeneous and anisotropic brane asymptotically evolves to a de Sitter spacetime in the presence of a positive cosmological constant on the brane. We discuss the violations of these sufficient conditions and we show that a negative nonlocal energy density or the presence of strong anisotropic stress (i.e., a magnetic field) may lead the brane to collapse. We discuss the generality of these conditions.
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First Results from the 2dF QSO redshift survey

ArXiv astro-ph/0103064 (2001)

Authors:

BJ Boyle, SM Croom, RJ Smith, T Shanks, PJ Outram, F Hoyle, L Miller, NS Loaring

Abstract:

We present some initial results from the 2dF QSO redshift survey. The aim of the survey is to produce an optically-selected catalogue of 25000 QSOs over the redshift range 0
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The 2dF QSO Redshift Survey - 10K@2K!

ArXiv astro-ph/0103056 (2001)

Authors:

T Shanks, BJ Boyle, SM Croom, F Hoyle, N Loaring, L Miller, PJ Outram, RJ Smith

Abstract:

With ~10000 QSO redshifts, the 2dF QSO Redshift Survey (2QZ) is already the biggest individual QSO survey. The aim for the survey is to have ~25000 QSO redshifts, providing an order of magnitude increase in QSO clustering statistics. We first describe the observational parameters of the 2dF QSO survey. We then describe several highlights of the survey so far; we present new estimates of the QSO luminosity function and the QSO correlation function. We also present the first estimate of the QSO power spectrum from the 2QZ catalogue, probing the form of the fluctuation power-spectrum out to the \~1000h-1Mpc scales only previously probed by COBE. We find a power spectrum which is steeper than the prediction of standard CDM and more consistent with the prediction of Lambda-CDM. The best-fit value for the power spectrum shape parameter for a range of cosmologies is Gamma=0.1+-0.1. Finally, we discuss how the complete QSO survey will be able to constrain the value of Omega_Lambda by combining results from the evolution of QSO clustering and from a geometric test of clustering isotropy.
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