TY  - JOUR
AU  - Jinno, Ryusuke
AU  - Konstandin, Thomas
AU  - Rubira, Henrique
AU  - van de Vis, Jorinde
TI  - Effect of density fluctuations on gravitational wave production in first-order phase transitions
JO  - Journal of cosmology and astroparticle physics
VL  - 2021
IS  - 12
SN  - 1475-7508
CY  - London
PB  - IOP
M1  - PUBDB-2021-05437
M1  - arXiv:2108.11947
M1  - DESY-21-131
SP  - 019
PY  - 2021
N1  - 22 pages, 14 figures
AB  - We study the effect of density perturbations on the process of first-order phase transitions and gravitational wave production in the early Universe. We are mainly interested in how the distribution of nucleated bubbles is affected by fluctuations in the local temperature. We find that large-scale density fluctuations (H<sub>*</sub>  <  k<sub>*</sub>  <  β) result in a larger effective bubble size at the time of collision, enhancing the produced amplitude of gravitational waves. The amplitude of the density fluctuations necessary for this enhancement is <span style="font-family:helvetica"><i>P</i><sub>ζ</sub> (k<sub>*</sub>)  >~(β/ H<sub>*</sub>)<sup>−2</sup>, and therefore the gravitational wave signal from first-order phase transitions with relatively large β/ H<sub>*</sub> can be significantly enhanced by this mechanism even for fluctuations with moderate amplitudes.
KW  - density: fluctuation (INSPIRE)
KW  - effect: density (INSPIRE)
KW  - density: perturbation (INSPIRE)
KW  - bubble: size (INSPIRE)
KW  - gravitational radiation: emission (INSPIRE)
KW  - bubble: nucleation (INSPIRE)
KW  - critical phenomena (INSPIRE)
KW  - temperature: fluctuation (INSPIRE)
KW  - cosmological phase transitions (autogen)
KW  - gravitational waves / sources (autogen)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000734341100013
DO  - DOI:10.1088/1475-7516/2021/12/019
UR  - https://bib-pubdb1.desy.de/record/473079
ER  -