👉 The sigma fluid, also known as the sigma liquid or sigma liquid phase, is a hypothetical, ultra-high-density fluid theorized to exist under extreme conditions of pressure and temperature, often associated with the cores of neutron stars or other dense astrophysical objects. Unlike conventional fluids, sigma fluid is characterized by its unique ability to maintain a liquid state at densities far beyond those of ordinary matter, possibly due to exotic quantum mechanical effects and strong interactions between particles. This fluid exhibits unusual properties such as extremely high viscosity, anomalous thermal conductivity, and potentially superconducting or superfluid behavior. The study of sigma fluid is crucial for understanding the internal structure and dynamics of neutron stars, as well as the behavior of matter in the most extreme environments in the universe.
