CMB spectral distortions from the decay of causally generated magnetic fields

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...

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

Cosmological Magnetic Fields vs . CMB

I present a short review of the effects of a cosmological magnetic field on the CMB temperature and polarization anisotropies. Various possibilities for constraining the magnetic field amplitude are discussed. Cosmological primordial seed magnetic fields were proposed to explain the existence of observed ∼ 10 −6 G magnetic fields in galaxies and clusters (see, e.g., Widrow 2002, Gio-vaninni 200...

Cosmic Magnetic Fields and the CMB

I describe the imprint of primordial magnetic fields on the CMB. I show that these are observable only if the field amplitude is of the order of B & 10G on Mpc scale. I further argue that such fields are strongly constrained by the stochastic background of gravity waves which they produce. Primordial magnetic fields, which are strong enough to be seen in the CMB, are compatible with the nucleos...

Probing early-universe phase transitions with CMB spectral distortions