Gravitational Decays of Secluded Scalars and Graviton Dark Radiation

arXiv:2512.03662 · hep-ph, astro-ph.CO, hep-th · Submitted 2025-12-03 · Read on arXiv

hep-ph, astro-ph.CO, hep-th

Submitted: 2025-12-03

Updated: 2026-08-26

Comments: 13 pages, 7 figures, v2: version accepted in PRD; Reference and Figure added; v3: typo in the legend of Fig. 5 corrected

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Trace — 6× in this paper · explained in 2 episodes
• Symmetry Breaking — 5× in this paper · explained in 3 episodes
• Standard Model — 4× in this paper
• Abundance — 3× in this paper · explained in 1 episode
• Regularization — 3× in this paper · explained in 3 episodes
• Benchmark — 2× in this paper · explained in 2 episodes
• Nonminimal coupling — 2× in this paper · explained in 2 episodes
• Beyond Standard Model — 1× in this paper
• Cooperation — 1× in this paper · explained in 2 episodes

Sources

• Gravitational Effects on Inflaton Decay
• Gravitational Particle Production in Oscillating Background and Its Cosmological Implications
• Production of Purely Gravitational Dark Matter
• Production of Purely Gravitational Dark Matter: The Case of Fermion and Vector Boson
• Gravitational Production of a Conformal Dark Sector
• Gravitational Vector Dark Matter
• Dark QCD Matters
• Gravitational portals in the early Universe
• Gravitational Portals with Non-Minimal Couplings
• Scalar field couplings to quadratic curvature and decay into gravitons
• A new cosmic microwave background constraint to primordial gravitational waves
• Improved limits on short-wavelength gravitational waves from the cosmic microwave background
• New constraints on primordial gravitational waves from Planck 2015
• Constraints on primordial gravitational waves from the Cosmic Microwave Background
• Increasing the effective number of neutrinos with decaying particles
• Planck 2018 results. VI. Cosmological parameters
• DESI 2024 VII: Cosmological Constraints from the Full-Shape Modeling of Clustering Measurements
• Gravitational Waves from Inflaton Decay and Bremsstrahlung
• Probing Gauss-Bonnet-Corrected Inflation with Gravitational Waves
• Optical gravitational waves as signals of Gravitationally-Decaying Particles

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