Abstract
The BB-mode angular correlation power spectrum of CMB is obtained by considering the primordial gravitational waves in the squeezed vacuum state for various inflationary models and results are compared with the joint analysis of the BICEP2/Keck Array and Planck 353 GHz data. The present results may constrain several models of inflation.
Highlights
Cosmic inflation is the most widely known scenario proposed for resolving several problems associated with the standard model of cosmology [1,2]
The primordial gravitational waves are very important in cosmology
The primordial gravitational waves are placed in a special quantum state called the squeezed vacuum state, a well-known state in quantum optics
Summary
Cosmic inflation is the most widely known scenario proposed for resolving several problems associated with the standard model of cosmology [1,2]. The primordial gravitational waves are placed in the squeezed vacuum state and its effect on the B B-mode correlation angular power spectrum of CMB is studied with WMAP data [26]. It is shown that the B B-mode angular power spectrum gets enhanced at its lower multipoles by considering the primordial gravitational waves in thermal state [27] These studies show that the primordial gravitational waves may exhibit both the squeezing and the thermal features and it is worthwhile to examine their combined effects on the B B-mode correlation angular power spectrum in light of the recent joint BICEP2/Keck Array and Planck data. The aim of the present work is to study effect of primordial gravitational waves in the squeezed vacuum state on the B B-mode correlation angular power spectrum of CMB for various slow-roll inflationary models. The obtained B B-mode correlation angular power spectrum of CMB for the squeezed vacuum as well as the joint effect of squeezing and thermal cases are compared with the joint BICEP2/Keck Array and Planck data
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