The spin correlation of fermion pairs created by a Kerr black hole gravitational potential

Understand

We study the properties of massive fermions created and scattered by a rotating Kerr black hole.

• The helicities of the scattered fermions can vary during propagation.
• A fermion with a right-handed helicity can become either right or left-handed after interacting with the gravitational potential.
• This implies that measuring characteristics of an escaping particle is insufficient to reconstruct all the characteristics of its infalling partner.