Thermal pressure on ultrarelativistic bubbles from a semiclassical formalism

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dc.citation.articleNumber24en_US
dc.citation.issueNumber11en_US
dc.citation.journalTitleJournal of Cosmology and Astroparticle Physicsen_US
dc.citation.volumeNumber2024en_US
dc.contributor.authorLong, Andrew J.en_US
dc.contributor.authorTurner, Jessicaen_US
dc.date.accessioned2025-01-09T20:16:58Zen_US
dc.date.available2025-01-09T20:16:58Zen_US
dc.date.issued2024en_US
dc.description.abstractWe study a planar bubble wall that is traveling at an ultrarelativistic speed through a thermal plasma. This situation may arise during a first-order electroweak phase transition in the early universe. As particles cross the wall, it is assumed that their mass grows from m a to m b , and they are decelerated causing them to emit massless radiation (m c = 0). We are interested in the momentum transfer to the wall, the thermal pressure felt by the wall, and the resultant terminal velocity of the wall. We employ the semiclassical current radiation (SCR) formalism to perform these calculations. An incident-charged particle is treated as a point-like classical electromagnetic current, and the spectrum of quantum electromagnetic radiation (photons) is derived by calculating appropriate matrix elements. To understand how the spectrum depends on the thickness of the wall, we explore simplified models for the current corresponding to an abrupt and a gradual deceleration. For the model of abrupt deceleration, we find that the SCR formalism can reproduce the P therm ∝ γ 0 w scaling found in earlier work by assuming that the emission is soft, but if the emission is not soft the SCR formalism can be used to obtain P therm ∝ γ 2 w instead. For the model of gradual deceleration, we find that the wall thickness L w enters to cutoff the otherwise log-flat radiation spectrum above a momentum of ∼ γ 2 w / L w , and we discuss the connections with classical electromagnetic bremsstrahlung.en_US
dc.identifier.citationLong, A. J., & Turner, J. (2024). Thermal pressure on ultrarelativistic bubbles from a semiclassical formalism. Journal of Cosmology and Astroparticle Physics, 2024(11), 024. https://doi.org/10.1088/1475-7516/2024/11/024en_US
dc.identifier.digitalLong_2024_J_Cosmol_Astropart_Phys_2024_024en_US
dc.identifier.doihttps://doi.org/10.1088/1475-7516/2024/11/024en_US
dc.identifier.urihttps://hdl.handle.net/1911/118108en_US
dc.language.isoengen_US
dc.publisherIOP Publishingen_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleThermal pressure on ultrarelativistic bubbles from a semiclassical formalismen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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