Cosmic Superstrings Revisited in Light of NANOGrav 15-Year Data
Cosmic Superstrings Revisited in Light of NANOGrav 15-Year Data
demonstrates that the common-spectrum process is duecosmological phase transition [6].12.5-year data[13]that contained the first reportedevidence for a common spectrum process in the nHzrange [14-16] that was subsequently confirmed by otherPTAs「17-19].In this paper we revisit cosmic strings inmodate the updated NANOGrav data as well as otherders of magnitude in frequency,whereas the extensionof the SMBH binary model to higher frequencies is sub-ject to larger uncertainties [20].Our aim in this paper,therefore,is to explore the robustness of the cosmic stringpredictions and whether it can avoid making testable pre-dictions for higher-frequency GW detectors.
物理学
cosmic stringgravitational wavepulsar timing array
JohnEllis,ChunshanLin,VilleVaskonen,MarekLewicki.Cosmic Superstrings Revisited in Light of NANOGrav 15-Year Data[EB/OL].(2024-09-27)[2025-10-21].https://chinaxiv.org/abs/202409.00247.点此复制
We analyze cosmic superstring models in light of NANOGrav 15-year pulsar timing data. A good fit is found for a string tension $G \mu \sim 10^{-12} - 10^{-11}$ and a string intercommutation probability $p \sim 10^{-3} - 10^{-1}$. Extrapolation to higher frequencies assuming standard Big Bang cosmology is compatible at the 68\% CL with the current LIGO/Virgo/KAGRA upper limit on a stochastic gravitational wave background in the 10 to 100 Hz range. The superstring interpretation of the NANOGrav data would be robustly testable by future experiments even in modified cosmological scenarios.
cosmic stringgravitational wavepulsar timing array
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