Multipole moments in scalar-tensor theory of gravity
George Pappas, Thomas P. Sotiriou
TL;DR
This paper develops a formalism to define and compute multipole moments in scalar-tensor theories of gravity, extending tools used in general relativity to alternative theories for better understanding of astrophysical objects.
Contribution
It introduces a new method for calculating multipole moments in scalar-tensor gravity, broadening the applicability of these tools beyond general relativity.
Findings
Formalism for multipole moments in scalar-tensor theories
Extension of multipole analysis beyond general relativity
Potential applications to neutron star studies
Abstract
Stationary, asymptotically flat spacetimes in general relativity can be characterized by their multipole moments. The moments have proved to be very useful tools for extracting information about the spacetime from various observables and, more recently, for establishing universalities in the structure of neutron stars. As a first step toward extending these methods beyond general relativity, we develop the formalism that allows one to define and calculate the multipole moments in scalar-tensor theories of gravity.
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