Dual gravitational wave signatures of instant preheating
Abstract In the instant preheating scenario efficient particle production occurs immediately following the period of inflationary expansion in the early Universe. We demonstrate that instant preheating predicts unique gravitational wave (GW) signals arising from two distinct origins. One source is the bremsstrahlung GWs produced through the decay of superheavy particles, an inevitable consequence of instant preheating. The other is GWs generated from the nonlinear dynamics of the inflaton and coupled scalar fields. Using numerical simulations, we show that the peak of the GW spectrum shifts depending on the coupling constants of the theory. The detection of these dual GW signatures, characteristic of instant preheating, provides novel opportunities for probing the dynamics of the early Universe.
Authors
- Kazunori Nakayama (ORCID: https://orcid.org/0000-0003-0187-6939)
- Yong Tang (ORCID: https://orcid.org/0000-0003-1100-2741)
- Wei-Yu Hu (ORCID: https://orcid.org/0009-0008-8912-9754)
- Volodymyr Takhistov (ORCID: https://orcid.org/0000-0003-2647-3431)
Institutions
- High Energy Accelerator Research Organization (JP)
- Kavli Institute for the Physics and Mathematics of the Universe (JP)
- The Graduate University for Advanced Studies, SOKENDAI (JP)
- Tohoku University (JP)
- Peking University (CN)
- International Centre for Theoretical Physics Asia-Pacific (CN)
- University of Chinese Academy of Sciences (CN)
- International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles
- The University of Tokyo (JP)
Publication Details
- Journal
- Journal of Cosmology and Astroparticle Physics
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1088/1475-7516/2025/01/029
- Citations
- 3
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 3.46