False vacuum decay in quantum mechanical first order phase transitions is a phenomenon with wide implications in cosmology, and presents interesting theoretical challenges. In the standard approach, it is assumed that false vacuum decay proceeds through the formation of bubbles that nucleate at random positions in spacetime and subsequently expand. In this paper we investigate the presence of correlations between bubble nucleation sites using a recently proposed semi-classical stochastic description of vacuum decay. This procedure samples vacuum fluctuations, which are then evolved using classical lattice simulations. We compute the two-point function for bubble nucleation sites from an ensemble of simulations, demonstrating that nucleation sites cluster in a way that is qualitatively similar to peaks in random Gaussian fields. We qualitatively assess the phenomenological implications of bubble clustering in early Universe phase transitions, which include features in the power spectrum of stochastic gravitational waves and an enhancement or suppression of the probability of observing bubble collisions in the eternal inflation scenario.
Fermionic Bubble Loop in Cosmological Collider Revisited: Exact signals from spectral and Mellin-Barnes methods
RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS)（RIKEN跨学科理论与数学科学中心（iTHEMS））；Department of Physics, Tsinghua University（清华大学物理系）；Cosmology, Gravity and Astroparticle Physics Group, Center for Theoretical Physics of the Universe, Institute for Basic Science（基础科学研究院宇宙理论物理中心宇宙学、引力与高能天体物理研究组）；Department of Physics, Institute of Science Tokyo（东京科学大学物理系）；Department of Physics and IPAP, Yonsei University（延世大学物理系及物理学与应用物理研究所）
Thermal Masses and Bubble-Wall Friction in Cosmological Phase Transitions
Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院）；INFN Sezione di Firenze（佛罗伦萨大学INFN分部）；Dipartimento di Fisica, Università della Calabria（卡拉布里亚大学物理系）；INFN, Gruppo Collegato di Cosenza（科森扎联合INFN小组）；Dipartimento di Fisica, Sapienza University of Rome and INFN（罗马智慧大学物理系及INFN）；Dipartimento di Fisica e Astronomia, Università di Firenze（佛罗伦萨大学物理与天文学系）；Department of Physics and Astronomy, University of Sussex（苏塞克斯大学物理与天文学系）
Probing the bubble interior with entanglement entropy and bulk-cone singularities
Università Cattolica del Sacro Cuore（天主教撒克雷圣心大学）；INFN Sezione di Perugia（意大利国家核物理研究所佩鲁加分部）；Institute for Theoretical Physics, KU Leuven（荷语鲁汶大学理论物理研究所）；TIFPA - INFN, c/o Dipartimento di Fisica, Università di Trento（特伦托大学物理系意大利国家核物理研究所理论与应用物理中心）；Yukawa Institute for Theoretical Physics, Kyoto University（京都大学汤川理论物理研究所）
Split Representations and Bubble Resummation for Massive de Sitter Correlators
Max-Planck-Institut für Physik, Werner-Heisenberg-Institut（马克斯·普朗克物理研究所，维尔纳·海森堡研究所）；Max Planck-IAS-NTU Center for Particle Physics, Cosmology and Geometry（马克斯·普朗克粒子物理、宇宙学与几何中心）；Arnold-Sommerfeld-Center for Theoretical Physics, Ludwig-Maximilians-Universität München（阿诺德·索末菲理论物理中心，慕尼黑大学）
