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Cai, Rong-Gen; Wang, Shao-Jiang
Effective picture of bubble expansion
Source PublicationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Language英语
KeywordFLUCTUATION-DISSIPATION FORMULA FALSE VACUUM GRAVITATIONAL-RADIATION MAGNETIC-FIELDS FINITE-TEMPERATURE PHASE-TRANSITION GROWTH WAVES NUCLEATION FATE
AbstractRecently the thermal friction on an expanding bubble from the cosmic first-order phase transition has been calculated to all orders of the interactions between the bubble wall and thermal plasma, leading to a gamma(2)-scaling instead of the previously estimated gamma(1)-scaling for the thermal friction exerted on a fast-moving bubble wall with a Lorentz factor gamma. We propose for the first time the effective equation of motion (EOM) for an expanding bubble wall in the presence of an arbitrary gamma-scaling friction to compute the efficiency factor from bubble collisions, which, in the case of gamma(2)-scaling friction, is found to be larger than the recently updated estimation when the bubble walls collide after starting to approach a constant terminal velocity, leading to a slightly larger signal of the gravitational waves background from bubble collisions due to its quadratic dependence on the bubble collision efficiency factor, although the gamma(2)-scaling friction itself has already suppressed the contribution from bubble collisions compared to that with gamma(1)-scaling friction. We also suggest a phenomenological parameterization for the out-of-equilibrium term in the Boltzmann equation that could reproduce the recently found (gamma(2) - 1)-scaling of the friction term in the effective EOM of an expanding bubble wall, which merits further study in future numerical simulations of bubble expansion and collisions.
2021
ISSN1475-7516
Issue3Pages:96
Cooperation Status国际
Subject AreaAstronomy & Astrophysics ; Physics
MOST Discipline CatalogueAstronomy & Astrophysics ; Physics, Particles & Fields
DOI10.1088/1475-7516/2021/03/096
Indexed BySCIE
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/27313
CollectionSCI期刊论文
Affiliation1.[Cai, Rong-Gen
2.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Sch Fundamental Phys & Math Sci, Hangzhou Inst Adv Study HIAS, Hangzhou 310024, Peoples R China
4.Korea Inst Adv Study KIAS, Quantum Universe Ctr, Seoul 02455, South Korea
5.Korea Inst Adv Study KIAS, Sch Phys, Seoul 02455, South Korea
6.Tufts Univ, Tufts Inst Cosmol, Dept Phys & Astron, 574 Boston Ave, Medford, MA 02155 USA
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GB/T 7714
Cai, Rong-Gen,Wang, Shao-Jiang. Effective picture of bubble expansion[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2021(3):96.
APA Cai, Rong-Gen,&Wang, Shao-Jiang.(2021).Effective picture of bubble expansion.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(3),96.
MLA Cai, Rong-Gen,et al."Effective picture of bubble expansion".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .3(2021):96.
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