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Compact Objects in Alternative Gravities

Universe, 2022
We address neutron stars and black holes in alternative gravities, after recalling their basic properties in General Relativity. Among the plethora of interesting alternative gravities we here focus on an interesting set of scalar-tensor theories.
Jose Luis Blázquez-Salcedo, Burkhard Kleihaus, Jutta Kunz   +2 more
doaj   +1 more source

Spin-polarized neutron matter, the maximum mass of neutron stars, and GW170817 [PDF]

Astrophys. J. 892, 14 (2020), 2019
We investigate how a phase transition from neutron-star matter to spin-polarized neutron matter affects the equation of state and mass-radius relation of neutron stars. While general extension schemes for the equation of state allow for high pressures inside neutron stars, we find that a phase transition to spin-polarized neutron matter excludes ...
arxiv   +1 more source

Heating up neutron stars with inelastic dark matter [PDF]

Journal of Cosmology and Astroparticle Physics, 2018
Neutron stars can provide new insight into dark matter properties, as these dense objects capture dark matter particles very efficiently. It has recently been shown that the energy transfer in the dark matter capture process can lead to appreciable ...
N. Bell, G. Busoni, S. Robles
semanticscholar   +1 more source

Thermal states of neutron stars with a consistent model of interior [PDF]

, 2017
We model the thermal states of both isolated neutron stars and accreting neutron stars in X-ray transients in quiescence and confront them with observations. We use an equation of state and superfluid baryon gaps, which are consistently calculated. We conclude that the direct Urca process is required to be consistent with low-luminous accreting neutron
arxiv   +1 more source

WIMP Annihilation and Cooling of Neutron Stars [PDF]

Phys.Rev.D77:023006,2008, 2007
We study the effect of WIMP annihilation on the temperature of a neutron star. We shall argue that the released energy due to WIMP annihilation inside the neutron stars, might affect the temperature of stars older than 10 million years, flattening out the temperature at $\sim 10^4$ K for a typical neutron star.
arxiv   +1 more source

The Emergence of a Lanthanide-rich Kilonova Following the Merger of Two Neutron Stars [PDF]

, 2017
We report the discovery and monitoring of the near-infrared counterpart (AT2017gfo) of a binary neutron-star merger event detected as a gravitational wave source by Advanced Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo (GW170817) and ...
N. Tanvir, A. Levan, C. Gonzalez-Fernandez, O. Korobkin, I. Mandel, S. Rosswog, J. Hjorth, P. D’Avanzo, A. Fruchter, Chris L. Fryer, T. Kangas, B. Milvang-Jensen, S. Rosetti, D. Steeghs, R. Wollaeger, Z. Cano, C. Copperwheat, S. Covino, V. D’Elia, A. U. Postigo, P. Evans, W. Even, S. Fairhurst, R. Jaimes, C. Fontes, Y. Fujii, J. Fynbo, B. Gompertz, J. Greiner, G. Hodosán, M. Irwin, P. Jakobsson, U. Jørgensen, D. A. Kann, J. Lyman, D. Malesani, R. McMahon, A. Melandri, P. O’Brien, J. Osborne, E. Palazzi, D. Perley, E. Pian, S. Piranomonte, M. Rabus, E. Rol, A. Rowlinson, S. Schulze, P. Sutton, C. Thoene, K. Ulaczyk, D. Watson, K. Wiersema, R. Wijers   +53 more
semanticscholar   +1 more source

Phase transitions in neutron stars and their links to gravitational waves [PDF]

Journal of Physics G: Nuclear and Particle Physics, 2019
The recent direct observation of gravitational wave event $GW170817$ and its $GRB170817A$ signal has opened up a new window to study neutron stars and heralds a new era of Astronomy referred to as the Multimessenger Astronomy.
M. Orsaria, G. Malfatti, M. Mariani, I. F. Ranea-Sandoval, Federico Garc'ia, W. Spinella, G. Contrera, G. Lugones, F. Weber   +8 more
semanticscholar   +1 more source

Hyperons and Neutron Stars [PDF]

Proceedings of The Modern Physics of Compact Stars 2015 — PoS(MPCS2015), 2013
Abstract In this work we briefly review some of the effects of hyperons on neutron and proto-neutron star properties. We revise the problem of the strong softening of the EoS, and the consequent reduction of the maximum mass, due to the presence of hyperons, a puzzle which has become more intriguing due the recent measurements of the unusually high ...
openaire   +5 more sources

Neutron rich nuclei and neutron stars [PDF]

, 2013
The PREX experiment at Jefferson Laboratory measures the neutron radius of 208Pb with parity violating electron scattering in a way that is free from most strong interaction uncertainties. The 208Pb radius has important implications for neutron rich matter and the structure of neutron stars.
arxiv   +1 more source

Neutron Stars Exclude Light Dark Baryons. [PDF]

Physical Review Letters, 2018
Exotic particles carrying baryon number and with a mass of the order of the nucleon mass have been proposed for various reasons including baryogenesis, dark matter, mirror worlds, and the neutron lifetime puzzle.
D. McKeen, A. Nelson, S. Reddy, Dake Zhou   +3 more
semanticscholar   +1 more source