Exploration to early universe by Josephson Junction Switching Current Detector

TL;DR

This paper proposes using a Josephson Junction Switching Current Detector to probe the stochastic gravitational wave background, potentially reaching sensitivities that allow exploration of physics beyond current bounds.

Contribution

It introduces a novel method employing JJSCD for detecting SGWB with enhanced sensitivity, enabling access to new physics regions beyond BBN constraints.

Findings

Sensitivity can reach h ≈ 10^{-19} realistically

Potential to reach h ≈ 10^{-21} in near future

Possibility to go below BBN bounds with frequency ratio enhancement

Abstract

In this paper, we propose a method to probe a Stochastic Gravitational Wave Background (SGWB) with Josephson Junction Switching Current Detector (JJSCD). The sensitivity for the shear can reach $h\simeq 10^{-19}$ realistically, $10^{-21}$ in the near future, $10^{-24}$ optimistically. If we utilize the enhancement factor from the ratio of the frequency, it is possible to reach further below the Big Bang Nucleosynthesis (BBN) bound. It will be interesting if we can access the region to discover a footprint of new physics.