Primordial black holes and curvature perturbations from false vacuum islands  

作　　者：Rong-Gen Cai Yu-Shi Hao Shao-Jiang Wang 

机构地区：[1]School of Physical Science and Technology,Ningbo University,Ningbo 315211,China [2]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [3]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [4]Asia Pacific Center for Theoretical Physics,Pohang 37673,Republic of Korea

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第9期58-72,共15页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant Nos.2021YFC2203004,2021YFA0718304,and 2020YFC2201502);the National Natural Science Foundation of China(Grant Nos.12105344,12235019,11821505,11991052,and 11947302);the Strategic Priority Research Program of the Chinese Academy of Sciences(CAS)(Grant Nos.XDB23030100,and XDA15020701);the Key Research Program of the CAS(Grant No.XDPB15);the Key Research Program of Frontier Sciences of CAS;the Science Research Grants from the China Manned Space Project(Grant No.CMS-CSST-2021-B01)。

摘　　要：Recently,much attention has been focused on the false vacuum islands that are flooded by an expanding ocean of true-vacuum bubbles slightly later than most of the other parts of the world.These delayed decay regions will accumulate locally larger vacuum energy density by staying in the false vacuum longer than those already transited into the true vacuum.A false vacuum island with thus acquired density contrast of a super-horizon size will evolve locally from radiation dominance to vacuum dominance,creating a local baby Universe that can be regarded effectively as a local closed Universe.If such density contrasts of super-horizon sizes can ever grow large enough to exceed the threshold of gravitational collapse,primordial black holes will form similar to those collapsing curvature perturbations on super-horizon scales induced by small-scale enhancements during inflation.If not,such density contrasts can still induce curvature perturbations potentially observable today.In this paper,we revisit and elaborate on the generations of primordial black holes and curvature perturbations from delayed-decayed false vacuum islands during asynchronous first-order phase transitions with fitting formulas convenient for future model-independent studies.

关 键 词：first-order phase transitions primordial black holes curvature perturbations 

分 类 号：P145.8[天文地球—天体物理]