Sound speed resonance of gravitational waves in Gauss-Bonnet-coupled inflation
We demonstrate the occurrence of sound speed resonances (SSR) in Gauss-Bonnet-coupled inflation across a wide range of coupling functions and parameters. After inflation, the damped oscillations of the inflaton around its potential minimum induces damped oscillations of the sound speed of tensor modes, leading to resonant amplification of the latter. Once the inflaton stabilizes around the minimum, the tensor sound speed reduces to unity (speed of light). In the context of multifield inflation, the sound speed oscillations can be followed by a second phase of inflation, resulting in a distinctive stochastic background of gravitational waves (GWs). We show that these GW signals can be probed by upcoming experiments such as SKA, DECIGO, and BBO depending on the duration of the second inflationary phase.
Authors
- Yermek Aldabergenov (ORCID: https://orcid.org/0000-0001-6021-9707)
- Yi-Fu Cai (ORCID: https://orcid.org/0000-0003-0706-8465)
- Andrea Addazi (ORCID: https://orcid.org/0000-0002-5955-0184)
Institutions
- University of Science and Technology of China (CN)
- Sichuan University (CN)
- Fudan University (CN)
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT)
Publication Details
- Journal
- Physical review. D/Physical review. D.
- Published
- 2024-12-19
- DOI
- https://doi.org/10.1103/physrevd.110.123530
- Citations
- 2
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 0.66
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- China Scholarship Council
- Sichuan University
- University of Science and Technology of China
- Higher Education Discipline Innovation Project
- National Key Research and Development Program of China
- Fundamental Research Funds for Central Universities of the Central South University