Zobrazeno 1 - 10
of 51
pro vyhledávání: '"Sagun, Violetta"'
Autor:
Koehn, Hauke, Giangrandi, Edoardo, Kunert, Nina, Somasundaram, Rahul, Sagun, Violetta, Dietrich, Tim
If dark matter (DM) accumulates inside neutron stars (NS), it changes their internal structure and causes a shift of the tidal deformability from the value predicted by the dense-matter equation of state (EOS). In principle, this shift could be obser
Externí odkaz:
http://arxiv.org/abs/2408.14711
Autor:
Giangrandi, Edoardo, Ávila, Afonso, Sagun, Violetta, Ivanytskyi, Oleksii, Providência, Constança
Publikováno v:
Particles 2024, 7(1), 179-200
We investigate the impact of asymmetric fermionic dark matter (DM) on the thermal evolution of neutron stars (NSs), considering a scenario where DM interacts with baryonic matter (BM) through gravity. Employing the two-fluid formalism, our analysis r
Externí odkaz:
http://arxiv.org/abs/2401.03295
Autor:
Ávila, Afonso, Giangrandi, Edoardo, Sagun, Violetta, Ivanytskyi, Oleksii, Providência, Constança
Publikováno v:
Mon. Not. R. Astron. Soc., 528, 6319 (2024)
We study the effect of asymmetric fermionic dark matter (DM) on the thermal evolution of neutron stars (NSs). No interaction between DM and baryonic matter is assumed, except the gravitational one. Using the two-fluid formalism, we show that DM accum
Externí odkaz:
http://arxiv.org/abs/2309.03894
Autor:
Sagun, Violetta, Giangrandi, Edoardo, Dietrich, Tim, Ivanytskyi, Oleksii, Negreiros, Rodrigo, Providência, Constança
Publikováno v:
Astrophys. J. 958, 49 (2023)
Once further confirmed in future analyses, the radius and mass measurement of HESS J1731-347 with $M=0.77^{+0.20}_{-0.17}~M_{\odot}$ and $R=10.4^{+0.86}_{-0.78}~\rm km$ will be among the lightest and smallest compact objects ever detected. This raise
Externí odkaz:
http://arxiv.org/abs/2306.12326
Publikováno v:
Phys. Rev. D 108, 114028 (2023)
We study the properties of hybrid stars containing a color superconducting quark matter phase in their cores, which is described by the chirally symmetric formulation of the confining relativistic density functional approach. It is shown that dependi
Externí odkaz:
http://arxiv.org/abs/2301.10765
Using an adapted version of the SGRID code, we construct for the first time consistent quasi-equilibrium configurations for a binary system consisting of two neutron stars in which each is admixed with dark matter. The stars are modelled as a system
Externí odkaz:
http://arxiv.org/abs/2301.03568
Autor:
Sagun, Violetta, Giangrandi, Edoardo, Ivanytskyi, Oleksii, Providência, Costança, Dietrich, Tim
We study the impact of asymmetric bosonic dark matter on neutron star properties, including possible changes of tidal deformability, maximum mass, radius, and matter distribution inside the star. The conditions at which dark matter particles tend to
Externí odkaz:
http://arxiv.org/abs/2211.10510
Autor:
Giangrandi, Edoardo, Sagun, Violetta, Ivanytskyi, Oleksii, Providência, Constança, Dietrich, Tim
Publikováno v:
ApJ 953 1, 115 (2023)
We propose a model of asymmetric bosonic dark matter (DM) with self-repulsion mediated by the vector field coupled to the complex scalar particles. By adopting the two-fluid formalism, we study different DM distribution regimes, either, fully condens
Externí odkaz:
http://arxiv.org/abs/2209.10905
Autor:
Vitiuk, Oleksandr V., Pugatch, Valery M., Bugaev, Kyrill A., Yakovenko, Nazar S., Panasiuk, Pavlo P., Zherebtsova, Elizaveta S., Dobishuk, Vasyl M., Chernyshenko, Sergiy B., Grinyuk, Borys E., Sagun, Violetta, Ivanytskyi, Oleksii
Publikováno v:
Particles 2022, 5(3), 245-264
Here, we propose a novel approach to experimentally and theoretically study the properties of QCD matter under new extreme conditions, namely having an initial temperature over 300~MeV and baryonic charge density over three times the values of the no
Externí odkaz:
http://arxiv.org/abs/2207.11816
Multi-messenger observations of compact binary mergers provide a new way to constrain the nature of dark matter that may accumulate in and around neutron stars. In this article, we extend the infrastructure of our numerical-relativity code BAM to ena
Externí odkaz:
http://arxiv.org/abs/2206.10887