Have pulsar timing array methods detected a cosmological phase transition?

被引：30
作者：
Addazi, Andrea [1 ,2 ]
Cai, Yi-Fu [3 ,4 ]
Marciano, Antonino [2 ,5 ,6 ,9 ]
Visinelli, Luca [7 ,8 ]
机构：
[1] Sichuan Univ, Coll Phys Sci & Technol, Ctr Theoret Phys, Chengdu 610065, Peoples R China
[2] INFN, Lab Nazl Frascati, Via E Fermi 54, I-00044 Frascati, Italy
[3] Univ Sci & Technol China, Sch Phys Sci, Deep Space Explorat Lab, Hefei 230026, Anhui, Peoples R China
[4] Univ Sci & Technol China, Sch Astron & Space Sci, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
[5] Fudan Univ, Ctr Field Theory & Particle Phys, Shanghai 200433, Peoples R China
[6] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
[7] Tsung Dao Lee Inst TDLI, 520 Shengrong Rd, Shanghai 201210, Peoples R China
[8] Shanghai Jiao Tong Univ, Sch Phys & Astron, 800 Dongchuan Rd, Shanghai 200240, Peoples R China
[9] INFN, Sez Roma Tor Vergata, I-00133 Rome, Italy
来源：
PHYSICAL REVIEW D | 2024年 / 109卷 / 01期
基金：
国家重点研发计划; 美国国家科学基金会;
关键词：
DATA SET SEARCH; GRAVITATIONAL-RADIATION; VACUUM; SCALE; CONSTRAINTS; NOISE; DECAY;
D O I：
10.1103/PhysRevD.109.015028
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We show that the recent detection of a gravitational wave (GW) background reported by various pulsar timing array (PTA) collaborations including NANOGrav-15 yr, PPTA, EPTA/InPTA, and CPTA can be explained in terms of first order phase transitions (FOPTs) from dark sector models (DSM). Specifically, we explore a model for first order phase transitions that involves the Majoron, a Nambu-Goldstone boson that is emerging from the spontaneous symmetry breaking of a U(1)L or U(1)B-L symmetry. We show how the predicted GW power spectrum, with a realistic choice of the FOPT parameters, is consistent with 1-sigma deviations from the estimated parameters of the background detected by the PTA collaborations.
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页数：7
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