Prospects for Taiji to detect a gravitational-wave background from cosmic strings

Abstract

Recently, multiple pulsar timing array collaborations have presented compelling evidence for a stochastic signal at nanohertz frequencies, potentially originating from cosmic strings. Cosmic strings are linear topological defects that can arise during phase transitions in the early Universe or as fundamental strings in superstring theory. This paper focuses on investigating the detection capabilities of Taiji, a planned space-based gravitational wave detector, for the gravitational wave background generated by cosmic strings. By analyzing simulated Taiji data and utilizing comprehensive Bayesian parameter estimation techniques, we demonstrate a significant improvement in precision compared to the NANOGrav 15-year data, surpassing it by an order of magnitude. This highlights the enhanced measurement capabilities of Taiji. Consequently, Taiji can serve as a valuable complementary tool to pulsar timing arrays in validating and exploring the physics of cosmic strings in the early Universe.

24 pages, 5 figures

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Cited by in corpus (6)

• Probing the equation of state of the early Universe with pulsar timing arrays
• Constraints on primordial curvature power spectrum with pulsar timing arrays
• Simultaneously probing the sound speed and equation of state of the early Universe with pulsar timing arrays
• Model-independent reconstruction of the primordial curvature power spectrum from PTA data
• Exploring the NANOGrav Signal and Planet-mass Primordial Black Holes through Higgs Inflation
• Detecting Cosmological Phase Transitions with Taiji: Sensitivity Analysis and Parameter Estimation