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astro-ph.CO2026
Gravitational waves from super-Hubble bubbles
Pulkit S. Ghoderao, Arttu Rajantie, Danièle Steer
We consider a cosmological first-order phase transition in which bubbles of true vacuum nucleate during inflation but do not collide and percolate until the Universe has entered th…
astro-ph.CO2025
Curvature perturbations from vacuum transition during inflation
Björn Garbrecht, Pulkit S. Ghoderao, Arttu Rajantie
We demonstrate that in the presence of a light scalar spectator field, vacuum transitions taking place during inflation can produce large, potentially detectable non-Gaussian signa…
astro-ph.CO2024
Curvature perturbations from preheating with scale dependence
Pulkit S. Ghoderao, Arttu Rajantie
We extend the formalism to calculate non-Gaussianity of primordial curvature perturbations produced by preheating in the presence of a light scalar field. The calculation is carrie…