FSD: Frequency Space Differential measurement of CMB spectral distortions

The CMB spectrum: Perspective of observing spectral distortions

Spectral distortions (deviations from a Planck distribution) of the cosmic microwave background (CMB) are potential sources of information on the thermal history of the Universe. So far however they escaped detection. We suggest a different observational approach useful to discover Bose–Einstein distortions. ! 2006 Elsevier B.V. All rights reserved. PACS: 03.09.05; 03.19.1; 12.03.1

CMB spectral distortions from small-scale isocurvature fluctuations

The damping of primordial perturbations at small scales gives rise to distortions of the cosmic microwave background (CMB). Here, the dependence of the distortion on the different types of cosmological initial conditions is explored, covering adiabatic, baryon/cold dark matter isocurvature, neutrino density/velocity isocurvature modes and some mixtures. The radiation transfer functions for each...

Probing early-universe phase transitions with CMB spectral distortions

Thermalization and Spectral Distortions

Distortions To be continuously transformed with other things is to be untransformed once and for all. The CMB exhibits a perfect blackbody form to the precision of current measurements. The deviations from the intensity of a blackbody are no more than 3 × 10 −4 of the peak intensity [116]. The question arises: how does the blackbody spectrum form and how is it maintained? We have seen in Chapte...

Radial Redshift Space Distortions

The radial component of the peculiar velocities of galaxies cause displacements in their positions in redshift space. We study the effect of the peculiar velocities on the linear redshift space two point correlation function. Our analysis takes into account the radial nature of the redshift space distortions and it highlights the limitations of the plane parallel approximation. We consider the ...