Citation

BibTex format

@article{Ghoderao:2026:10/075,
author = {Ghoderao, PS and Rajantie, A and Steer, DA},
doi = {10/075},
journal = {Journal of Cosmology and Astroparticle Physics},
pages = {075--075},
title = {Gravitational waves from super-Hubble bubbles},
url = {http://dx.doi.org/10.1088/1475-7516/2026/10/075},
volume = {2026},
year = {2026}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - <jats:title>Abstract</jats:title>                  <jats:p>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 the radiation-dominated era. If the collisions take place soon after the end of inflation, the size of these bubbles can be significantly greater than the Hubble length.This has two important consequences for the gravitational waves produced by the bubble collisions:First, as the peak frequency is determined by the comoving bubble radius, it can be well below the MHz frequencies typical for bubble collisions at the end of inflation.Second, when comparing collisions beginning at the same time, the amplitude of the gravitational waves is greatly enhanced relative to Hubble-sized and smaller bubbles.Together, these two effects mean that gravitational waves produced by super-Hubble bubbles soon after the end of inflation can be within the observable frequency and amplitude ranges of LIGO and NANOGrav, as well as LISA and other future gravitational wave experiments. We demonstrate this with a simple illustrative model.</jats:p>
AU  - Ghoderao,PS
AU  - Rajantie,A
AU  - Steer,DA
DO  - 10/075
EP  - 075
PY  - 2026///
SP  - 075
TI  - Gravitational waves from super-Hubble bubbles
T2  - Journal of Cosmology and Astroparticle Physics
UR  - http://dx.doi.org/10.1088/1475-7516/2026/10/075
UR  - https://doi.org/10.1088/1475-7516/2026/10/075
VL  - 2026
ER  -
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