Parity violation in pre-inflationary bounce

Abstract

The power suppression at largest scale in the CMB TT powerspectrum might imply the occurrence of a pre-inflationary bounce. We calculate the circularly polarized gravitational wave, leaded by the gravitational Chern-Simons term which universally appears in particle physics and string theory, in an inflationary background with the pre-inflationary bounce. The circularly polarized gravitational wave will induce TB and EB correlations at CMB last scatting surface. We find that although the BB powerspectrum at largest scale is also suppressed, the TB and EB powerspectra at corresponding scales may be enhanced.

15 pages, 4 figures,the final version

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Cited by in corpus (17)

• G-Bounce Inflation: Towards Nonsingular Inflation Cosmology with Galileon Field
• Bounce universe from string-inspired Gauss-Bonnet gravity
• The bouncing cosmology with $F(R)$ gravity and its reconstructing
• $\Lambda$CDM Bounce Cosmology without $\Lambda$CDM: the case of modified gravity
• Pre-Inflationary Bounce Effects on Primordial Gravitational Waves of $f(R)$ Gravity
• Pre-inflationary primordial perturbations
• Primordial perturbations with pre-inflationary bounce
• Chirality oscillation of primordial gravitational waves during inflation
• Oscillating modulation to B-mode polarization from varying propagating speed of primordial gravitational waves
• Superbounce and Loop Quantum Ekpyrotic Cosmologies from Modified Gravity: $F(R)$, $F(G)$ and $F(T)$ Theories
• Unimodular $f(G)$ gravity
• Parity-violation in bouncing cosmology
• Effects of a Pre-inflationary de Sitter Bounce on the Primordial Gravitational Waves in $f(R)$ Gravity Theories
• Towards the bounce inflationary gravitational wave
• Perturbations in Bouncing and Cyclic Models, a General Study
• Thermal gravitational-wave background in the general pre-inflationary scenario
• Parity-violating primordial gravitational waves from null energy condition violation