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Constraints on the inflationary vacuum and reheating era from NANOGrav

astro-ph.CO · 2026-05-06 · unverdicted · novelty 5.0

NANOGrav data favors a blue-tilted tensor spectrum with nt ≈ 2.2, radiation-dominated reheating, and alpha-vacuum states over standard Bunch-Davies, with a frequency-dependent alpha suggested to resolve the blue-tilt tension.

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