Oscillations and parity violation in gravitational wave background from extra tensor modes

arXiv:2508.08481 · astro-ph.CO, gr-qc, hep-th · Submitted 2025-08-11 · Read on arXiv

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

Submitted: 2025-08-11

Updated: 2026-09-02

Comments: 30+17 pages, 7 figures; Substantially revised: the origin of the oscillatory features in the power spectrum has been clarified analytically and confirmed numerically

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

Terminology

• Anisotropy — 5× in this paper · explained in 3 episodes
• Non-Gaussianity — 4× in this paper · explained in 2 episodes
• Phase Transitions — 3× in this paper · explained in 2 episodes
• Metric-Affine Gravity — 2× in this paper · explained in 2 episodes
• Accuracy — 1× in this paper · explained in 1 episode
• Cosmic Microwave Background — 1× in this paper
• Domain Walls — 1× in this paper · explained in 2 episodes
• Effective Field Theory (EFT) — 1× in this paper · explained in 2 episodes
• General Relativity — 1× in this paper
• Institute for Basic Science — 1× in this paper
• Nine-Year Wilkinson Microwave Anisotropy Probe — 1× in this paper
• Reheating — 1× in this paper · explained in 2 episodes
• Trace — 1× in this paper · explained in 2 episodes

Sources

• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Planck 2018 results. X. Constraints on inflation
• Resummation of Massive Gravity
• Theoretical Aspects of Massive Gravity
• Massive Gravity
• Bimetric Gravity from Ghost-free Massive Gravity
• Interacting Spin-2 Fields
• Ghostfree quadratic curvature theories with massive spin-2 and spin-0 particles
• Non-linearly ghost-free higher curvature gravity
• Consistent inflationary cosmology from quadratic gravity with dynamical torsion
• Cosmological Perturbation Theory in Metric-Affine Gravity
• Gauge-flation: Inflation From Non-Abelian Gauge Fields
• Effective Field Theory of Chiral Gravitational Waves
• Primordial-tensor-induced stochastic gravitational waves
• Extra-tensor-induced origin for the PTA signal: No primordial black hole production
• Gravitational Waves from Spectator Scalar Fields
• Non-Abelian Gauge Field Inflation
• Chromo-Natural Inflation: Natural inflation on a steep potential with classical non-Abelian gauge fields
• Gauge Fields and Inflation
• Perturbations in Chromo-Natural Inflation

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