Possible Explanation to Low CMB Quadrupole

Abstract

The universe might experience many cycles with different vacua. The slow-roll inflation may be preceded by kinetic-dominated contraction occurring in "adjacent" vacua during some cycles. In this report we briefly show this phenomenon may lead to a cutoff of primordial power spectrum. Thus in some sense the CMB at large angular scale might encode the information of other vacua.

10 pages, 3 eps figures, accepted for publication in PRD, v2 revised with published version

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