Teukolsky-Starobinsky Identities - a Novel Derivation and Generalizations

TL;DR

This paper introduces a new derivation of the Teukolsky-Starobinsky identities using confluent Heun functions, extends these identities to new classes of perturbations in Kerr and Schwarzschild metrics, and presents an efficient method for calculating Starobinsky's constant.

Contribution

It provides a novel derivation and generalization of the Teukolsky-Starobinsky identities based on confluent Heun functions, expanding their applicability to new perturbation classes.

Findings

Derivation of Teukolsky-Starobinsky identities using confluent Heun functions.

Extension of identities to new classes of perturbations in Kerr and Schwarzschild metrics.

Development of an efficient recurrent method for calculating Starobinsky's constant.

Abstract

We present a novel derivation of the Teukolsky-Starobinsky identities, based on properties of the confluent Heun functions. These functions define analytically all exact solutions to the Teukolsky master equation, as well as to the Regge-Wheeler and Zerilli ones. The class of solutions, subject to Teukolsky-Starobinsky type of identities is studied. Our generalization of the Teukolsky-Starobinsky identities is valid for the already studied linear perturbations to the Kerr and Schwarzschild metrics, as well as for large new classes of of such perturbations which are explicitly described in the present article. Symmetry of parameters of confluent Heun's functions is shown to stay behind the behavior of the known solutions under the change of the sign of their spin weights. A new efficient recurrent method for calculation of Starobinsky's constant is described.