We discuss cosmic microwave background anisotropies in models with an unconventional primordial power spectrum. In particular, we consider an initial power spectrum with some “spiky” corrections. Interestingly, such a primordial power spectrum generates “wavy” structure in the CMB angular power spectrum. Some possible models generating such a primordial power spectrum from inflaton dynamics are...

We present estimates of the angular power spectra of the synchrotron radiation intensity fluctuations at 6 and 20 cm for the shell type supernova remnant Cas A and the filled-centre Crab supernova remnant. We find that the intensity fluctuations of both sources have a power law power spectrum with index −3.24 ± 0.03. This power law power spectrum is consistent with the magnetohydrodynamic turbu...

Fluctuations in the 21cm brightness from cosmic hydrogen at redshifts z & 6 were sourced by the primordial density perturbations from inflation as well as by the radiation from galaxies. We propose a method to separate these components based on the angular dependence of the 21cm fluctuation power spectrum. Peculiar velocities increase the power spectrum by a factor of ∼ 2 compared to density fl...

Statistical characteristics of the angular power spectrum of scattered radiation for power law spectrum of electron density fluctuations in turbulent collisional anisotropic magnetized plasma are considered.

The angular power spectrum of Cosmic Microwave Background (CMB) radiation has proved to be an excellent observation to measure different cosmological parameters. In order to extract cosmological parameters precisely we need to remove foreground contamination as well as detector noise bias. In this paper we present a framework to extract CMB angular power spectrum from the multi-frequency observ...