Cosmic superstrings in large volume compactifications: PTAs, LISA and time-varying tension

2025/04/29 by Ghoshal, Anish, Revello, Filippo, Villa, Gonzalo · 10 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)

paper · doi:10.48550/arxiv.2504.20994

Abstract

The Stochastic Gravitational Wave Background (SGWB) from cosmic superstrings offers one of the few known possibilities to test String Theory within current experimental reach. However, in order to be compatible with the existing constraints, the tension of a cosmic superstring network is required to lie several orders of magnitude below the Planck scale. This is naturally realized in string compactifications where the volume of the extra dimensions is parametrically large (in string units). We estimate the GW spectrum arising from cosmic superstrings in such scenarios, providing analytical formulae as well as numerical results. Crucially, we do so within a semi-realistic string cosmology scenario, taking into account various modified cosmological epochs (such as kination or early matter domination) induced by the presence of moduli and a time-dependent string tension. We show that part of the spectrum generically lies within reach of LISA and ET, with a large class of models predicting a characteristic drop in the amplitude which may be robustly probed by LISA. The corresponding signal would encode information on the dynamics of moduli and reheating. On the other hand, the ultra-high frequency part of the spectrum can be significantly enhanced by a long, early phase of kination with time-varying tension, yielding a spectral index unique to this set-up.

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Cited by

• Evolution of Generic Varying-Tension Cosmic Strings in Expanding Spacetimes
• Fibre Inflation Meets Quintessence: Implications of Perturbative Stabilisation
• High-frequency Gravitational Waves from Superstring Phases in the Early Universe
• Gravitational Waves from Multiple Cosmic Superstrings and the Overshoot Problem
• Axion-Scalar Systems and Dynamical Distances
• Dynamics of Cosmic Superstrings and the Overshoot Problem
• Cosmic string gravitational wave backgrounds at LISA: I. Signal survey, template reconstruction, and model comparison
• Self-Tracking Solutions for Asymptotic Scalar Fields
• Coexisting Flux String Vacua from Numerical Kähler Moduli Stabilisation
• Dynamical Systems and Superstring Phases in the Early Universe

Related

• The stochastic gravitational wave background from cosmic superstrings
• Cosmic (super)strings with a time-varying tension
• Gravitational waves from metastable cosmic strings in the delayed scaling scenario
• Gravitational Waves From Cosmic Strings
• Gravitational waves from cosmic strings in LISA: reconstruction pipeline and physics interpretation