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Echoes of Inflationary First-Order Phase Transitions in the CMB

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arxiv 1512.07538 v2 pith:TLQWGWKK submitted 2015-12-23 astro-ph.CO hep-phhep-th

Hongliang Jiang , Tao Liu , Sichun Sun , Yi Wang This is my paper · ORCID
classification astro-ph.COhep-phhep-th
keywords cptsduringfirst-ordergeneratedphasetransitionsewbgewpt
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Cosmological phase transitions (CPTs), such as the Grand Unified Theory (GUT) and the electroweak (EW) ones, play a significant role in both particle physics and cosmology. In this letter, we propose to probe the first-order CPTs, by detecting gravitational waves (GWs) which are generated during the phase transitions through the cosmic microwave background (CMB). If happened around the inflation era, the first-order CPTs may yield low-frequency GWs due to bubble dynamics, leaving imprints on the CMB. In contrast to the nearly scale-invariant primordial GWs caused by vacuum fluctuation, these bubble-generated GWs are scale dependent and have non-trivial B-mode spectra. If decoupled from inflaton, the EWPT during inflation may serve as a probe for the one after reheating where the baryon asymmetry could be generated via EW baryogenesis (EWBG). The CMB thus provides a potential way to test the feasibility of the EWBG, complementary to the collider measurements of Higgs potential and the direct detection of GWs generated during EWPT.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Gravitational Waves of GUT Phase Transition during Inflation

    hep-ph 2025-01 conditional novelty 7.0 of 10

    A general deformation function maps gravitational wave spectra from phase transitions during inflation into today's spectrum; for GUT-scale transitions the peak can appear near 10 Hz or mHz.

  2. Tunnelling out of Starobinsky inflation: Raising the spectral tilt

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    A first-order phase-transition exit from a displaced Starobinsky branch truncates ~12 e-folds, shifting the spectral tilt from n_s≈0.965 to ≈0.973 at r≈2×10⁻³.

  3. Simulating first-order phase transition during inflation

    hep-ph 2026-02 conditional novelty 6.0 of 10

    A GUT-scale first-order phase transition embedded in Starobinsky inflation completes near the end of inflation, and lattice simulations confirm the predicted oscillatory gravitational-wave signal.

  4. Curvature perturbations from vacuum transition during inflation

    astro-ph.CO 2025-02 conditional novelty 5.0 of 10

    Vacuum transitions during inflation, modulated by a light spectator field, can generate curvature perturbations with non-Gaussianity fNL ~ O(10) in a Higgs inflation setup.

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