# Numerical studies on core collapse supernova in self-interacting massive scalar-tensor gravity

## TL;DR

This paper explores how self-interacting massive scalar fields in scalar-tensor gravity affect core collapse supernova signals, showing that self-interaction can suppress gravitational waves and influence detection prospects.

## Contribution

It demonstrates that scalar field self-interaction significantly alters gravitational-wave signals during supernova core collapse, impacting observational constraints and detection strategies.

## Key findings

- Self-interaction suppresses scalarization and gravitational-wave amplitude.
- Suppression effect is frequency-dependent and detectable by LIGO/Virgo.
- Detection of signals could reveal the presence of scalar field self-interaction.

## Abstract

We investigate stellar core collapse in scalar-tensor theory with a massive self-interacting scalar field. In these theories, strong long-lived inverse chirp signals could be induced during the stellar core collapse, which provides us with several potential smoking-gun signatures that could be found using current ground-based detectors. We show that the existence of self-interaction in the potential of the scalar field can significantly suppress spontaneous scalarization and the amplitude of the monopole gravitational-wave radiation. Moreover, this suppression due to self-interaction is frequency dependent and may be discernible in LIGO/Virgo's sensitive band. Therefore, self-interaction should be considered when constraining scalar-tensor coupling parameters with gravitational-wave detections. Alternatively, if such monopole gravitational-wave signals are detected, then one may be able to infer the presence of self-interaction.