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- W3089276071 abstract "The NANOGrav pulsar timing array experiment recently reported evidence for a stochastic common-spectrum process affecting pulsar timing residuals in its 12.5-year dataset, which might be interpreted as the first ever detection of a stochastic gravitational wave background (SGWB). I examine whether the NANOGrav detection might be explained by a SGWB produced during inflation, focusing on the implications for the inflationary parameters $n_T$ and $r$, with $n_T$ the tensor spectral index and $r$ the tensor-to-scalar ratio. I find that explaining the NANOGrav detection while complying with current upper limits on $r$ from BICEP2/Keck Array and Planck requires $r gtrsim {cal O}(10^{-6})$ in conjunction with an extremely blue tensor spectrum, $0.7 lesssim n_T lesssim 1.3$. However, the identified region of $n_T$-$r$ parameter space is in strong tension with Cosmic Microwave Background and Big Bang Nucleosynthesis constraints on the radiation energy density in the early Universe. Keeping in mind the important caveat of having assumed a pure power-law parametrization for the primordial tensor power spectrum, these results appear to exclude an inflationary interpretation of the possible first ever detection of a SGWB by NANOGrav." @default.
- W3089276071 created "2020-10-01" @default.
- W3089276071 creator A5048780307 @default.
- W3089276071 date "2020-09-28" @default.
- W3089276071 modified "2023-09-27" @default.
- W3089276071 title "Implications of the NANOGrav pulsar timing results for inflation" @default.
- W3089276071 hasPublicationYear "2020" @default.
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