Cosmic Superstrings Revisited in Light of NANOGrav 15-Year Data

2023/06/29 by Ellis, John, Lewicki, Marek, Lin, Chunshan +1 · 8 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)

paper · doi:10.48550/arxiv.2306.17147

Abstract

We analyze cosmic superstring models in light of NANOGrav 15-year pulsar timing data. A good fit is found for a string tension G μ∼ 10^-12 - 10^-11 and a string intercommutation probability p ∼ 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.

Cited by

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• High-frequency Gravitational Waves from Superstring Phases in the Early Universe
• Metastable Strings and Gravitational Waves in One-Scale Models
• NANOGrav 15-year gravitational-wave signals from binary supermassive black-holes seeded by primordial black holes, and implications for the origins of Little Red Dots
• Beyond the Daisy Chain: Running and the 3D EFT View of Supercooled Phase Transitions
• Discriminating Between Models of the Nanohertz Gravitational-Wave Background with Pulsar Timing Arrays
• Validation of NANOGrav 15-year data and ACT data by modified inflation in entropic cosmology
• Implications for Pulsar Timing Arrays of Sub-solar Black Hole Detections: From LVK to Einstein Telescope and Cosmic Explorer

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