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Modeling dynamical scalarization with a resummed post-Newtonian expansion

MPS-Authors
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Sennett,  Noah
Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Buonanno,  Alessandra
Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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1603.03300.pdf
(Preprint), 2MB

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Citation

Sennett, N., & Buonanno, A. (2016). Modeling dynamical scalarization with a resummed post-Newtonian expansion. Physical Review D, 93: 124004. doi:10.1103/PhysRevD.93.124004.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-7107-D
Abstract
Despite stringent constraints set by astrophysical observations, there remain viable scalar-tensor theories that could be distinguished from general relativity with gravitational-wave detectors. A promising signal predicted in these alternative theories is dynamical scalarization, which can dramatically affect the evolution of neutron-star binaries near merger. Motivated by the successful treatment of spontaneous scalarization, we develop a formalism that partially resums the post-Newtonian expansion to capture dynamical scalarization in a mathematically consistent manner. We calculate the post-Newtonian order corrections to the equations of motion and scalar mass of a binary system. Through comparison with quasi-equilibrium configuration calculations, we verify that this new approximation scheme can accurately predict the onset and magnitude of dynamical scalarization.