Artigo Acesso aberto Revisado por pares

Null energy condition violation during inflation and pulsar timing array observations

2024; Springer Nature; Volume: 2024; Issue: 2 Linguagem: Inglês

10.1007/jhep02(2024)008

ISSN

1127-2236

Autores

Gen Ye, Mian Zhu, Yong Cai,

Tópico(s)

Geophysics and Gravity Measurements

Resumo

A bstract Recently, evidence of stochastic gravitational wave background (SGWB) signals observed by pulsar timing array (PTA) collaborations, has prompted investigations into their origins. We explore the compatibility of a proposed inflationary scenario, incorporating an intermediate null energy condition (NEC)-violating phase, with the PTA observations. The NEC violation potentially amplifies the primordial tensor power spectrum, offering a promising explanation for PTA observations. Numerical analyses, primarily focused on NANOGrav’s 15-year results, reveal the model’s compatibility with PTA data. Notably, the model predicts a nearly scale-invariant GW spectrum in the mHz frequency range, which sets our scenario apart from other interpretations predicting a red primordial GW spectrum on smaller scales.

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