# Constraining quark-hadron interface tension in the multi-messenger era

## TL;DR

This paper investigates how the quark-hadron interface tension influences the properties of hybrid stars, aiming to constrain this parameter through future gravitational wave and NICER observations.

## Contribution

It introduces a model to study the effects of quark-hadron interface tension on star properties and suggests observational constraints in the multi-messenger era.

## Key findings

- Varying interface tension significantly affects star radii and deformabilities.
- Potential to constrain interface tension with upcoming gravitational wave data.
- Model incorporates relativistic mean-field for nuclear matter and perturbation for quark phase.

## Abstract

We study the interface effects of quark-hadron mixed phase in compact stars. The properties of nuclear matter are obtained based on the relativistic-mean-field model. For the quark phase, we adopt perturbation model with running quark masses and coupling constant. At certain choices of parameter sets, it is found that varying the quark-hadron interface tension will have sizable effects on the radii ($\Delta R \approx 600$ m) and tidal deformabilities ($\Delta \Lambda/\Lambda \approx 50\%$) of hybrid stars. These provide possibilities for us to constrain the quark-hadron interface tension with future gravitational wave observations as well as the ongoing NICER mission.