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Trace of the energy-momentum tensor and macroscopic properties of neutron stars

Podkowka, Dylan M. ; Mendes, Raissa F. P. ; Poisson, Eric

Physical review. D, 2018-09, Vol.98 (6), p.064057, Article 064057 [Periódico revisado por pares]

College Park: American Physical Society

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Título:
Trace of the energy-momentum tensor and macroscopic properties of neutron stars
Autor: Podkowka, Dylan M. ; Mendes, Raissa F. P. ; Poisson, Eric
Assuntos: Bayesian analysis ; Confidence intervals ; Distribution functions ; Flux density ; Mathematical analysis ; Momentum ; Neutron stars ; Neutrons ; Phenomenology ; Probabilistic inference ; Probability distribution functions ; Properties (attributes) ; Relativity ; Stars ; Statistical analysis ; Statistical inference ; Tensors
É parte de: Physical review. D, 2018-09, Vol.98 (6), p.064057, Article 064057
Descrição: A generic feature of scalar extensions of general relativity is the coupling of the scalar degrees of freedom to the trace T of the energy-momentum tensor of matter fields. Interesting phenomenology arises when the trace becomes positive-when pressure exceeds one third of the energy density-a condition that may be satisfied in the core of neutron stars. In this work, we study how the positiveness of the trace of the energy-momentum tensor correlates with macroscopic properties of neutron stars. We first show that the compactness for which T=0 at the stellar center is approximately equation-of-state independent, and given by C=0.262−0.017+0.011 (90% confidence interval). Next, we exploit Bayesian inference to derive a probability distribution function for the value of T at the stellar center given a putative measurement of the compactness of a neutron star. This investigation is a necessary step in order to use present and future observations of neutron star properties to constrain scalar-tensor theories based on effects that depend on the sign of T.
Editor: College Park: American Physical Society
Idioma: Inglês

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Trace of the energy-momentum tensor and macroscopic properties of neutron stars

Podkowka, Dylan M. ; Mendes, Raissa F. P. ; Poisson, Eric

College Park: American Physical Society

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