Near-extremal black holes as initial conditions of long GRB-supernovae and probes of their gravitational wave emission

TL;DR

This paper models black hole spin dynamics in supernovae and mergers to explain gamma-ray burst durations and proposes a new gravitational wave detection method for nearby events.

Contribution

It introduces modified Bardeen equations to identify hyper-accretion in black holes and links spin-down to GRB durations, unifying long and short GRB phenomena.

Findings

Black hole spin-down correlates with GRB durations.

Proposes a novel matched filtering method for gravitational wave detection.

Suggests major gravitational wave emissions are unseen in current data.

Abstract

Long gamma-ray bursts (GRBs) associated with supernovae and short GRBs with Extended Emission (SGRBEE) from mergers are probably powered by black holes as a common inner engine, as their prompt GRB emission satisfies the same Amati correlation in the $E_{p,i}-E_{iso}$ plane. We introduce modified Bardeen equations to identify hyper-accretion driving newly formed black holes in core-collapse supernovae to near-extremal spin as a precursor to prompt GRB emission. Subsequent spin-down is observed in the BATSE catalog of long GRBs. Spin-down provides a natural unification of long durations associated with the lifetime of black hole spin for normal long GRBs and SGRBEEs, given the absence of major fallback matter in mergers. The results point to major emissions unseen in high frequency gravitational waves. A novel matched filtering method is described for LIGO-Virgo and KAGRA broadband probes of nearby core-collapse supernovae at essentially maximal sensitivity.