Chandrasekhar–Page equations

Chandrasekhar–Page equations describe the wave function of the spin-1/2 massive particles, that resulted by seeking a separable solution to the Dirac equation in Kerr metric or Kerr–Newman metric. In 1976, Subrahmanyan Chandrasekhar showed that a separable solution can be obtained from the Dirac equation in Kerr metric.[1] Later, Don Page extended this work to Kerr-Newman metric, that is applicable to charged black holes.[2] In his paper, Page notices that N. Toop also derived his results independently, as informed to him by Chandrasekhar.

By assuming a normal mode decomposition of the form for the time and the azimuthal component of the spherical polar coordinates , Chandrasekhar showed that the four bispinor components can be expressed as product of radial and angular functions. The two radial and angular functions, respectively, are denoted by , and , . The energy as measured at infinity is and the axial angular momentum is which is a half-integer.

Chandrasekhar–Page angular equations

The angular functions satisfy the coupled eigenvalue equations,[3]

where

and . Here is the angular momentum per unit mass of the black hole and is the rest mass of the particle. Eliminating between the foregoing two equations, one obtains

The function satisfies the adjoint equation, that can be obtained from the above equation by replacing with . The boundary conditions for these second-order differential equations are that (and ) be regular at and . The eigenvalue problem presented here in general requires numerical integrations for it to be solved. Explicit solutions are available for the case where .[4]

References

  1. Chandrasekhar, S. (1976-06-29). "The solution of Dirac's equation in Kerr geometry". Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences. The Royal Society. 349 (1659): 571–575. Bibcode:1976RSPSA.349..571C. doi:10.1098/rspa.1976.0090. ISSN 2053-9169. S2CID 122791570.
  2. Page, Don N. (1976-09-15). "Dirac equation around a charged, rotating black hole". Physical Review D. American Physical Society (APS). 14 (6): 1509–1510. Bibcode:1976PhRvD..14.1509P. doi:10.1103/physrevd.14.1509. ISSN 0556-2821.
  3. Chandrasekhar, S.,(1983). The mathematical theory of black holes. Clarenden Press, Section 104
  4. Chakrabarti, S. K. (1984-01-09). "On mass-dependent spheroidal harmonics of spin one-half". Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences. The Royal Society. 391 (1800): 27–38. Bibcode:1984RSPSA.391...27C. doi:10.1098/rspa.1984.0002. ISSN 2053-9169. JSTOR 2397528. S2CID 120673756.
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