Probing small-scale anisotropic inflation with PTA and LISA

2023/09/13 by Kuang, Yu-Ting, Zhou, Jing-Zhi, Wu, Di +1 · 2 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)

paper · doi:10.48550/arxiv.2309.06676

Abstract

In June 2023, multiple PTA collaborations provided evidence for the existence of a SGWB. As a significant source of the SGWB, SIGW receive extensive attention. We explore the influence of anisotropic primordial power spectra on second-order SIGW and derive explicit expressions for the energy density spectra. For specific anisotropic inflation models, we analyze the impacts of Finslerian inflation and gauge field inflation models on PTA and LISA and generalize the findings to model-independent scenarios. Our results indicate that current PTA observations can not rule out the existence of small-scale anisotropic primordial perturbations.

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• Primordial black holes with anisotropic hair
• Isotropy, anisotropies and non-Gaussianity in the scalar-induced gravitational-wave background: diagrammatic approach for primordial non-Gaussianity up to arbitrary order

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