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Nuclear matter

About: Nuclear matter is a research topic. Over the lifetime, 10180 publications have been published within this topic receiving 248261 citations.


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TL;DR: In this article, the mass and radius of the millisecond pulsar PSR J0030+0451 have been inferred via pulse-profile modeling of X-ray data obtained by NASA's NICER mission.
Abstract: Both the mass and radius of the millisecond pulsar PSR J0030+0451 have been inferred via pulse-profile modeling of X-ray data obtained by NASA's NICER mission. In this Letter we study the implications of the mass-radius inference reported for this source by Riley et al. (2019) for the dense matter equation of state (EOS), in the context of prior information from nuclear physics at low densities. Using a Bayesian framework we infer central densities and EOS properties for two choices of high-density extensions: a piecewise-polytropic model and a model based on assumptions of the speed of sound in dense matter. Around nuclear saturation density these extensions are matched to an EOS uncertainty band obtained from calculations based on chiral effective field theory interactions, which provide a realistic description of atomic nuclei as well as empirical nuclear matter properties within uncertainties. We further constrain EOS expectations with input from the current highest measured pulsar mass; together, these constraints offer a narrow Bayesian prior informed by theory as well as laboratory and astrophysical measurements. The NICER mass-radius likelihood function derived by Riley et al. (2019) using pulse-profile modeling is consistent with the highest-density region of this prior. The present relatively large uncertainties on mass and radius for PSR J0030+0451 offer, however, only a weak posterior information gain over the prior. We explore the sensitivity to the inferred geometry of the heated regions that give rise to the pulsed emission, and find a small increase in posterior gain for an alternative (but less preferred) model. Lastly, we investigate the hypothetical scenario of increasing the NICER exposure time for PSR J0030+0451.

134 citations

Journal ArticleDOI
TL;DR: In this paper, the properties of symmetric nuclear matter are investigated in a phenomenological non-linear relativistic field theory of nuclear matter, and a mean field approximation is made. But the importance of non-Yukawa type nuclear interactions is discussed.

134 citations

Journal ArticleDOI
TL;DR: In this article, the microscopic theory of the nuclear matter equation of state at finite temperature is developed within the Bloch-De Dominicis diagrammatic expansion. And the authors show that the dominant terms are the ones that correspond to the zero-temperature Bethe-Brueckner Goldstone diagrams, where the temperature is introduced in the occupation numbers only, represented by Fermi distributions.
Abstract: The microscopic theory of the nuclear matter equation of state at finite temperature is developed within the Bloch--De Dominicis diagrammatic expansion. The liquid gas phase transition of symmetric nuclear matter is identified, with a critical temperature ${T}_{c}\ensuremath{\approx}20 \mathrm{MeV},$ using the Argonne ${v}_{14}$ as the bare $\mathrm{NN}$ interaction and a phenomenological three-body force adjusted to give the correct saturation point. Pure neutron and asymmetric matter, relevant to supernovae explosions, are also studied. It is found that the liquid-gas phase transition disappears at asymmetries $ag0.9.$ At the bounce-off of the supernova collapse, temperatures of several tens of MeV are reached and we find that the compressibility steeply increases at such temperatures. Finally, we find that the equation of state gives a ``limiting temperature'' of finite nuclei consistent with the experimental observation in compound nucleus reactions. A careful analysis of the diagrammatic expansion reveals that the dominant terms are the ones that correspond to the zero-temperature Bethe-Brueckner-Goldstone diagrams, where the temperature is introduced in the occupation numbers only, represented by Fermi distributions, thus justifying this commonly used procedure of naively introducing the temperature effect.

134 citations

Journal ArticleDOI
TL;DR: In this article, the authors studied the effect of the δ-meson mean field on the nuclear symmetry energy of asymmetric nuclear matter in neutron stars, and showed that the energy per particle of a neutron star is then larger at high densities than the one with no δ field included.

134 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023132
2022299
2021252
2020268
2019256
2018240