Angular power spectrum of induced gravitational waves: breaking model and parameter degeneracies in PTA observations

arXiv:2609.01193 · astro-ph.CO, gr-qc, hep-ph, hep-th · Submitted 2026-09-01 · Read on arXiv

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

Submitted: 2026-09-01

Updated: 2026-09-01

Comments: 28 pages, 7 figures, 1 table

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

Terminology

• Non-Gaussianity — 47× in this paper · explained in 2 episodes
• Primordial non-Gaussianity — 23× in this paper · explained in 2 episodes
• Anisotropy — 6× in this paper · explained in 3 episodes
• pulsar timing arrays — 6× in this paper · explained in 2 episodes
• Phase Transitions — 4× in this paper · explained in 2 episodes
• Domain Walls — 3× in this paper · explained in 2 episodes
• Bayesian Inference — 2× in this paper · explained in 5 episodes
• Degeneracy — 2× in this paper · explained in 3 episodes
• Frequency Dependence — 2× in this paper · explained in 2 episodes
• Stochastic Gravitational Wave Background (SGWB) — 2× in this paper · explained in 3 episodes
• Abundance — 1× in this paper · explained in 1 episode
• Accuracy — 1× in this paper · explained in 1 episode
• Laser Interferometer Space Antenna — 1× in this paper
• Primordial Black Holes (PBHs) — 1× in this paper · explained in 7 episodes
• Reheating — 1× in this paper · explained in 2 episodes
• Symmetry Breaking — 1× in this paper · explained in 3 episodes

Sources

• Observation of Gravitational Waves from a Binary Black Hole Merger
• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence
• GW170814: A Three-Detector Observation of Gravitational Waves from a Binary Black Hole Coalescence
• The NANOGrav 15-year Data Set: Evidence for a Gravitational-Wave Background
• The NANOGrav 15-year Data Set: Observations and Timing of 68 Millisecond Pulsars
• The second data release from the European Pulsar Timing Array III. Search for gravitational wave signals
• Search for an isotropic gravitational-wave background with the Parkes Pulsar Timing Array
• Searching for the nano-Hertz stochastic gravitational wave background with the Chinese Pulsar Timing Array Data Release I
• The NANOGrav 15-year Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational Wave Background
• Massive black hole binary systems and the NANOGrav 12.5 year results
• Astrophysics Milestones For Pulsar Timing Array Gravitational Wave Detection
• Implications for the Supermassive Black Hole Binaries from the NANOGrav 15-year Data Set
• Cosmological phase transitions: from perturbative particle physics to gravitational waves
• NANOGrav Signal from a Dark Conformal Phase Transition
• Have pulsar timing array methods detected a cosmological phase transition?
• Implication of nano-Hertz stochastic gravitational wave on dynamical dark matter through a dark first-order phase transition
• Cosmological Interpretation for the Stochastic Signal in Pulsar Timing Arrays
• Constraints on holographic QCD phase transitions from PTA observations
• Cosmic String Interpretation of NANOGrav Pulsar Timing Data

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