Path integral Monte Carlo simulation of helium at negative pressures

TL;DR

This paper uses Path Integral Monte Carlo simulations to study liquid helium at negative pressures, analyzing the spinodal line, sound velocity, and superfluid transition behavior across various temperatures.

Contribution

It provides new insights into helium's properties at negative pressures through detailed PIMC simulations, including the spinodal line and sound velocity.

Findings

Calculated the temperature dependence of the spinodal line.

Analyzed the pressure dependence of the isothermal sound velocity.

Discussed the shape of the dispersion curve at negative pressures.

Abstract

Path integral Monte Carlo (PIMC) simulations of liquid helium at negative pressure have been carried out for a temperature range from the critical temperature to below the superfluid transition. We have calculated the temperature dependence of the spinodal line as well as the pressure dependence of the isothermal sound velocity in the region of the spinodal. We discuss the slope of the superfluid transition line and the shape of the dispersion curve at negative pressures.