Gravitational wave emission from a cosmic string loop: Global case

被引：11

作者：

Baeza-Ballesteros, Jorge ^{[1
,2
]}

Copeland, Edmund J. ^{[3
]}

Figueroa, Daniel G. ^{[1
,2
]}

Lizarraga, Joanes ^{[4
,5
]}

机构：

[1] CSIC, Inst Fis Corpuscular IFIC, Valencia 46980, Spain

[2] Univ Valencia, Valencia 46980, Spain

[3] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[4] Univ Basque Country, UPV EHU, Dept Phys, Bilbao 48080, Spain

[5] Univ Basque Country, UPV EHU, EHU Quantum Ctr, Leioa 48940, Bizkaia, Spain

来源：

PHYSICAL REVIEW D | 2024年 / 110卷 / 04期

基金：

欧盟地平线“2020”;

关键词：

DOMAIN-WALLS; RADIATION; EVOLUTION; DECAY;

D O I：

10.1103/PhysRevD.110.043522

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the simultaneous decay of global string loops into scalar particles (massless and massive modes) and gravitational waves (GWs). Using field-theory simulations in flat space-time of isolated loops with initial length similar to 80-1700 times their core width, we determine the power emitted into scalar particles, P phi , and GWs, P GW , and characterize the loop-decay timescale as a function of its initial length, energy, and angular momentum. We quantify infrared and ultraviolet lattice dependencies of our results. For all type of loops and initial conditions considered, GW emission is always suppressed compared to particles as P GW /P phi approximate to O(10)(v/mp)2 ( 10 )( v/m p ) 2 << 1, where v is the vacuum expectation value associated with string formation. These conclusions are robust for the length-to-width ratios considered, with no indication they should change if the ratio is increased. The results suggest that the GW background from a global string network, such as in dark-matter axion scenarios, will be suppressed compared to previous expectations.

引用

页数：12

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