Energy-Momentum and Angular Momentum Carried by Gravitational Waves in Extended New General Relativity

TL;DR

This paper investigates energy-momentum and angular momentum carried by gravitational waves in an extended teleparallel formulation of general relativity, finding results consistent with standard GR and applicable to pulsar observations.

Contribution

It introduces a consistent definition of energy-momentum and angular momentum in extended teleparallel gravity, aligning with general relativity results for gravitational waves.

Findings

Wave form matches that of general relativity.

Energy-momentum loss aligns with GR predictions.

Angular momentum loss matches GR under certain conditions.

Abstract

In an extended, new form of general relativity, which is a teleparallel theory of gravity, we examine the energy-momentum and angular momentum carried by gravitational wave radiated from Newtonian point masses in a weak-field approximation. The resulting wave form is identical to the corresponding wave form in general relativity, which is consistent with previous results in teleparallel theory. The expression for the dynamical energy-momentum density is identical to that for the canonical energy-momentum density in general relativity up to leading order terms on the boundary of a large sphere including the gravitational source, and the loss of dynamical energy-momentum, which is the generator of \emph{internal} translations, is the same as that of the canonical energy-momentum in general relativity. Under certain asymptotic conditions for a non-dynamical Higgs-type field $\psi^{k}$, the loss of ``spin'' angular momentum, which is the generator of \emph{internal} $SL(2,C)$ transformations, is the same as that of angular momentum in general relativity, and the losses of canonical energy-momentum and orbital angular momentum, which constitute the generator of Poincar\'{e} \emph{coordinate} transformations, are vanishing. The results indicate that our definitions of the dynamical energy-momentum and angular momentum densities in this extended new general relativity work well for gravitational wave radiations, and the extended new general relativity accounts for the Hulse-Taylor measurement of the pulsar PSR1913+16.