Ultra-high Frequency Gravitational Waves from Scattering, Bremsstrahlung and Decay during Reheating
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866910757789106176 |
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| author | Xu, Yong |
| author_facet | Xu, Yong |
| contents | We investigate ultra-high frequency gravitational waves (GWs) from gravitons generated during inflationary reheating. Specifically, we study inflaton scattering with its decay product, where the couplings involved in this $2 \to 2$ scattering are the same as those in the $1 \to 3$ graviton Bremsstrahlung process. We compute the graviton production rate via such $2 \to 2$ scattering. Additionally, we compare the resulting GW spectrum with that from Bremsstrahlung as well as that from pure $2 \to 2$ inflaton scatterings. For completeness, the GW spectrum from graviton pair production through one-loop induced $1 \to 2$ inflaton decay is also analyzed. With a systematic comparison among the four sources of GWs, we find that $2 \to 2$ inflaton scattering with its decay product can dominate over Bremsstrahlung if the reheating temperature is larger than the inflaton mass. Pure inflaton $2 \to 2$ scattering is typically subdominant compared to Bremsstrahlung except in the high-frequency tail. The contribution from one-loop induced $1 \to 2$ inflaton decay is shown to be suppressed compared to Bremsstrahlung and pure inflaton $2 \to 2$ scattering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_03256 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultra-high Frequency Gravitational Waves from Scattering, Bremsstrahlung and Decay during Reheating Xu, Yong High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We investigate ultra-high frequency gravitational waves (GWs) from gravitons generated during inflationary reheating. Specifically, we study inflaton scattering with its decay product, where the couplings involved in this $2 \to 2$ scattering are the same as those in the $1 \to 3$ graviton Bremsstrahlung process. We compute the graviton production rate via such $2 \to 2$ scattering. Additionally, we compare the resulting GW spectrum with that from Bremsstrahlung as well as that from pure $2 \to 2$ inflaton scatterings. For completeness, the GW spectrum from graviton pair production through one-loop induced $1 \to 2$ inflaton decay is also analyzed. With a systematic comparison among the four sources of GWs, we find that $2 \to 2$ inflaton scattering with its decay product can dominate over Bremsstrahlung if the reheating temperature is larger than the inflaton mass. Pure inflaton $2 \to 2$ scattering is typically subdominant compared to Bremsstrahlung except in the high-frequency tail. The contribution from one-loop induced $1 \to 2$ inflaton decay is shown to be suppressed compared to Bremsstrahlung and pure inflaton $2 \to 2$ scattering. |
| title | Ultra-high Frequency Gravitational Waves from Scattering, Bremsstrahlung and Decay during Reheating |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2407.03256 |