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Generating enhanced parity-violating gravitational waves during inflation with violation of the null energy condition
- Source :
- Physical Review D. 107
- Publication Year :
- 2023
- Publisher :
- American Physical Society (APS), 2023.
-
Abstract
- A violation of the null energy condition (NEC) during inflation in a single-field inflation model will naturally enhance the amplitude of the parity violation effect (defined by $\Delta\chi$) of inflationary primordial gravitational waves (GWs), provided the inflaton is non-minimally coupled to a gravitational Chern-Simons term. After going through the NEC-violating phase, the Universe enters subsequent slow-roll inflation with a higher energy scale (i.e., a greater Hubble parameter $H$), which results in an enhanced nearly scale-invariant power spectrum (i.e., $P_{\rm T}$) of inflationary primordial GWs in the high-frequency band, while $P_{\rm T}$ remains consistent with observations in the frequency band of the cosmic microwave background. Therefore, the violation of NEC during inflation will amplify the observability (i.e., $P_{\rm T}\cdot\Delta\chi$) of the parity violation effect on small scales. Intriguingly, our model has particular oscillatory features on $\Delta\chi$ that may not be mimicked by others.<br />Comment: 24 pages, 16 figures; new references added, updated to match the published version
- Subjects :
- High Energy Physics - Theory
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
High Energy Physics - Theory (hep-th)
FOS: Physical sciences
General Relativity and Quantum Cosmology (gr-qc)
General Relativity and Quantum Cosmology
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- ISSN :
- 24700029 and 24700010
- Volume :
- 107
- Database :
- OpenAIRE
- Journal :
- Physical Review D
- Accession number :
- edsair.doi.dedup.....9a4710cbc0eec3442603b3f70b1376fc