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Estimate of the cosmological bispectrum from the MAXIMA-1 cosmic microwave background map

Physical Review Letters 88:24 (2002) 2413021-2413024

Authors:

MG Santos, A Balbi, J Borrill, PG Ferreira, S Hanany, AH Jaffe, AT Lee, J Magueijo, B Rabii, PL Richards, GF Smoot, R Stompor, CD Winant, JH Wu

Abstract:

The measurement of the cosmic microwave background taken during the MAXIMA-1 flight was used to estimate the bispectrum of cosmological perturbations. An estimator for the bispectrum was proposed that appropriated in the flat sky approximation and was applied to the MAXIMA-1 data. This measurement placed constraints on models of the inflation and the bispectrum analysis of the data showed the consistency of the data with Gaussianity.
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Estimate of the cosmological bispectrum from the MAXIMA-1 cosmic microwave background map.

Phys Rev Lett 88:24 (2002) 241302

Authors:

MG Santos, A Balbi, J Borrill, PG Ferreira, S Hanany, AH Jaffe, AT Lee, J Magueijo, B Rabii, PL Richards, GF Smoot, R Stompor, CD Winant, JHP Wu

Abstract:

We use the measurement of the cosmic microwave background taken during the MAXIMA-1 flight to estimate the bispectrum of cosmological perturbations. We propose an estimator for the bispectrum that is appropriate in the flat sky approximation, apply it to the MAXIMA-1 data, and evaluate errors using bootstrap methods. We compare the estimated value with what would be expected if the sky signal were Gaussian and find that it is indeed consistent, with a chi(2) per degree of freedom of approximately unity. This measurement places constraints on models of inflation.
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Erratum: “Discovery of Radio-Loud Broad Absorption Line Quasars Using Ultraviolet Excess and Deep Radio Selection” (ApJ, 505, L7 [1998])

The Astrophysical Journal American Astronomical Society 571:2 (2002) l191-l191

Authors:

MS Brotherton, W van Breugel, RJ Smith, BJ Boyle, T Shanks, SM Croom, L Miller, RH Becker
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Estimate of the Cosmological Bispectrum from the MAXIMA-1 Cosmic Microwave Background Map

Physical Review Letters 88 (2002) 241302 4pp

Authors:

P Ferreira, M. Santos, S. Hanany, J. Magueijo
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Observable consequences of cold clouds as dark matter

Monthly Notices of the Royal Astronomical Society 332:2 (2002)

Authors:

E Kerins, J Binney, J Silk

Abstract:

Cold, dense clouds of gas have been proposed to explain the dark matter in Galactic haloes, and have also been invoked in the Galactic disc as an explanation for the excess faint submillimetre sources detected by SCUBA. Even if their dust-to-gas ratio is only a small percentage of that in conventional gas clouds, these dense systems would be opaque to visible radiation. We examine the possibility that the data sets of microlensing experiments searching for massive compact halo objects can also be used to search for occultation signatures by such clouds. We compute the rate and time-scale distribution of stellar transits by clouds in the Galactic disc and halo. We find that, for cloud parameters typically advocated by theoretical models, thousands of transit events should already exist within microlensing survey data sets. We examine the seasonal modulation in the rate caused by the Earth's orbital motion and find it provides an excellent probe of whether detected clouds are of disc or halo origin.
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