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  • Letter
  • Open Access

Bubble wall velocity from holography

Yago Bea1, Jorge Casalderrey-Solana2, Thanasis Giannakopoulos3, David Mateos2,4, Mikel Sanchez-Garitaonandia2, and Miguel Zilhão3

  • 1School of Mathematical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom
  • 2Departament de Física Quàntica i Astrofísica & Institut de Ciències del Cosmos (ICC), Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
  • 3Centro de Astrofísica E Gravitação - CENTRA, Departamento de Física, Instituto Superior Técnico - IST, Universidade de Lisboa - UL, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
  • 4Institució Catalana de Recerca i Estudis Avançats (ICREA), Lluís Companys 23, 08010 Barcelona, Spain

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Phys. Rev. D 104, L121903 – Published 17 December, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.L121903

Abstract

Cosmological phase transitions proceed via the nucleation of bubbles that subsequently expand and collide. The resulting gravitational wave spectrum depends crucially on the bubble wall velocity. We use holography to compute the wall velocity from first principles in a strongly coupled, non-Abelian, four-dimensional gauge theory. The wall velocity is determined dynamically in terms of the nucleation temperature. We verify that ideal hydrodynamics provides a good description of the system everywhere except near the wall.

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Phys. Rev. D 104, L121903– Published 17 December, 2021
  • Received 20 May 2021
  • Accepted 29 November 2021
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