Peculiar Features in the Cosmic Microwave Background Radiation
نویسندگان
چکیده
4 1 Standard framework 5 1.1 Big bang models . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 The cosmic microwave background . . . . . . . . . . . . . . . . . . 10 2 Characterizing early Universe fluctuations 15 2.1 Density fluctuations . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.2 CMB temperature fluctuations . . . . . . . . . . . . . . . . . . . . . 18 2.3 Fluctuations on a sphere: the spherical harmonics . . . . . . . . . . . 22 2.3.1 Correlated l–modes . . . . . . . . . . . . . . . . . . . . . . . 23 2.3.2 Correlated m–modes . . . . . . . . . . . . . . . . . . . . . . 25 2.3.3 Correlations in inverted images . . . . . . . . . . . . . . . . 27 3 Non–Gaussian fluctuations in the CMB 28 3.
منابع مشابه
Peculiar Velocity, Cosmic Perturbation Theory and the Cmb Anisotropy
It is proved that the cosmological density perturbation is associated with a peculiar velocity field. This allows a simple formulation of cosmological perturbation theory, which works entirely with quasi-Newtonian fluid flow equations. As an illustration, the large scale cosmic microwave background anisotropy (Sachs-Wolfe effect) is calculated without any reference to the metric perturbation. I...
متن کاملTesting Homogeneity on Large Scales
We review observational tests for the homogeneity of the Universe on large scales. Redshift and peculiar velocity surveys, radio sources, the X-Ray Background, the Lyman-α forest and the Cosmic Microwave Background are used to set constraints on inhomogeneous models and in particular on fractal-like models. Assuming the Cosmological Principle and the FRW metric, we estimate cosmological paramet...
متن کاملCosmic String Theory: The Current Status
This is a pedagogical introduction to the basics of the cosmic string theory and also a review of the recent progress made with respect to the macrophysical predictions of the theory. Topics covered include, string formation and evolution, large scale structure formation, generation of peculiar velocity flows, cosmic microwave background (CMB) fluctuations, lensing, gravitational waves and cons...
متن کاملPeculiar Velocity and Deaberration of the Sky
Recent studies have found the earth’s peculiar velocity to be significant in microwave-background–based tests for compact cosmic topology, and modifications to these tests have been proposed. Tests of non-Gaussianity, weaklensing analysis, and new tests using improved cosmic microwave background (CMB) data will also be sensitive to peculiar velocity. We propose here to simplify matters by showi...
متن کاملDetermining the motion of the solar system relative to the cosmic microwave background using type Ia supernovae
We estimate the solar system motion relative to the cosmic microwave background using type Ia supernovae (SNe) measurements. We take into account the correlations in the error bars of the SNe measurements arising from correlated peculiar velocities. Without accounting for correlations in the peculiar velocities, the SNe data we use appear to detect the peculiar velocity of the solar system at a...
متن کامل