Generating enhanced primordial GWs during inflation with intermittent violation of NEC and diminishment of GW propagating speed

被引：15
作者：
Cai, Yong [1 ]
Piao, Yun-Song [2 ,3 ,4 ,5 ]
机构：
[1] Zhengzhou Univ, Sch Phys & Microelect, Zhengzhou 450001, Henan, Peoples R China
[2] Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China
[3] UCAS, Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, Hangzhou 310024, Peoples R China
[4] Int Ctr Theoret Phys Asia Pacific, Beijing, Peoples R China
[5] Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2022年 / 2022卷 / 06期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
Cosmology of Theories BSM; Classical Theories of Gravity; Spacetime Singularities;
D O I：
10.1007/JHEP06(2022)067
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We investigate both the null energy condition (NEC) violating scenario and the c(T)-diminishing scenario for generating enhanced power spectrum of primordial gravitational waves (GWs) during inflation, where c(T) is the propagating speed of primordial GWs. Both of these two scenarios can be realized stably with theories beyond Horndeski, hence can be uniformly implemented within the framework of the effective field theory. We calculate the power spectrum of primordial GWs by assuming that the inflationary Universe undergoes three phases, where the violation of NEC or the diminishment of c(T) occurs in the intermediate phase. A template of the spectrum is given for the NEC-violating scenario. We also discuss the underlying relation and discrepancy between these two scenarios with a disformal transformation.
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页数：24
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