# Updated Astrophysical Equation-of-State Constraints on the Color-Superconducting Gap

## TL;DR

This paper updates astrophysical constraints on the color-superconducting gap in neutron star matter using new NICER data and Bayesian analysis, refining the limits on the gap's maximum value across relevant densities.

## Contribution

It provides an updated analysis of the color-superconducting gap constraints incorporating recent NICER measurements and a novel Bayesian approach with an extended prior.

## Key findings

- Upper bounds on the CFL gap in neutron star densities.
- Bayesian analysis supports previous reasonable constraints.
- Refined limits across a broader density range.

## Abstract

We summarize and update using new NICER measurements the results of arXiv:2401.16253, in which we used various astrophysical neutron-star observations to set an upper bound on the CFL color-superconducting gap in a range of baryon chemical potentials $\mu_B \in [2.1,3.2]$, above those reached within neutron stars. We also corroborate the ``reasonable" constraint from arXiv:2401.16253 on the maximum value of the color-superconducting gap by performing a new Bayesian analysis using a prior that extends a two-segment Gaussian process connecting the whole density range between CEFT and pQCD.