What quantum mechanical effect stabilizes a Neutron Star against further collapse?

Answer

Neutron degeneracy pressure.

When a collapsing core reaches a mass between approximately 1.4 and 3 solar masses, the immense pressure forces electrons to combine with protons, effectively squeezing the material into a dense object composed almost entirely of neutrons, known as a neutron star. This structure is prevented from collapsing further into a singularity by a quantum mechanical phenomenon called neutron degeneracy pressure. This pressure arises because neutrons, being fermions, resist occupying the same quantum state, thus providing a powerful outward resistance that halts the gravitational crush, allowing the neutron star, roughly the size of a small city, to maintain stability.

What quantum mechanical effect stabilizes a Neutron Star against further collapse?

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