Work

Double-layered vacuum bubbles and cosmological phase transitions

Year: 2026

Type: article

Abstract: We investigate the evolution and formation of double-layered vacuum bubbles during cosmological phase transitions with multiple vacua. We employ lattice simulations to show that flyover transitions can produce double-layered vacuum bubbles by overcoming successive potential barriers, thereby suggesting a novel bubble vacuum configuration in cosmological phase transitions. The evolution of these bubbles, including wall acceleration, collisions, and the formation of trapped regions, is explored through numerical simulations. Our results show that the dynamics of double-layered bubbles differ significantly from standard single-wall bubbles, with implications for cosmological observables such as gravitational wave production and baryogenesis.

Source: The European Physical Journal C

DOI: 10.1140/epjc/s10052-026-15512-7

Authors: Dongdong Wei, Zong-Kuan Guo, Qiqi Fan

Institutions: Chinese Academy of Sciences, University of Chinese Academy of Sciences, Sun Yat-sen University

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funder: National Natural Science Foundation of China

Awards: G3266504514, G6009552194