scholarly journals Towards mitigation of apparent tension between nuclear physics and astrophysical observations by improved modeling of neutron star matter

2021 ◽  
Vol 103 (10) ◽  
Author(s):  
Bhaskar Biswas ◽  
Prasanta Char ◽  
Rana Nandi ◽  
Sukanta Bose
Keyword(s):  
Neutron Star ◽  
Nuclear Physics ◽  
Neutron Star Matter

scholarly journals Anomalous thermodynamics and phase transitions in neutron star matter

2007 ◽  
Vol 75 (6) ◽  
Author(s):  
C. Ducoin ◽  
K. H. O. Hasnaoui ◽  
P. Napolitani ◽  
Ph. Chomaz ◽  
F. Gulminelli
Keyword(s):  
Phase Transitions ◽  
Neutron Star ◽  
Neutron Star Matter

Proton Fraction in Hot Neutron Star Matter with a Chiral Hadronic Model

2002 ◽  
Vol 19 (10) ◽  
pp. 1432-1435 ◽  
Author(s):  
Guo Hua ◽  
Zhou Ran ◽  
Liu Yu-Xin
Keyword(s):  
Neutron Star ◽  
Neutron Star Matter ◽  
Hadronic Model

scholarly journals Delta baryons in neutron-star matter under strong magnetic fields

2021 ◽  
Vol 57 (7) ◽  
Author(s):  
Veronica Dexheimer ◽  
Kauan D. Marquez ◽  
Débora P. Menezes
Keyword(s):  
Neutron Star ◽  
Magnetic Fields ◽  
Neutron Star Matter ◽  
Strong Magnetic Fields

scholarly journals Multimessenger approaches to exploring dense matter in neutron stars

2021 ◽  
Author(s):  
◽  
Lukas Weih
Keyword(s):  
Phase Transition ◽  
Neutron Star ◽  
Nuclear Physics ◽  
Computational Cost ◽  
Dense Matter ◽  
High Energy ◽  
Radiative Transport ◽  
Binary Neutron Star ◽  
Starting Point ◽  
Numerical Astrophysics

High-energy astrophysics plays an increasingly important role in the understanding of our universe. On one hand, this is due to ground-breaking observations, like the gravitational-wave detections of the LIGO and Virgo network or the black-hole shadow observations of the EHT collaboration. On the other hand, the field of numerical relativity has reached a level of sophistication that allows for realistic simulations that include all four fundamental forces of nature. A prime example of how observations and theory complement each other can be seen in the studies following GW170817, the first detection of gravitational waves from a binary neutron-star merger. The same detection is also the chronological starting point of this Thesis. The plethora of information and constraints on nuclear physics derived from GW170817 in conjunction with theoretical computations will be presented in the first part of this Thesis. The second part goes beyond this detection and prepares for future observations when also the high-frequency postmerger signal will become detectable. Specifically, signatures of a quark-hadron phase transition are discussed and the specific case of a delayed phase transition is analyzed in detail. Finally, the third part of this Thesis focuses on the inclusion of radiative transport in numerical astrophysics. In the context of binary neutron-star mergers, radiation in the form of neutrinos is crucial for realistic long-term simulations. Two methods are introduced for treating radiation: the approximate state-of-the-art two-moment method (M1) and the recently developed radiative Lattice-Boltzmann method. The latter promises to be more accurate than M1 at a comparable computational cost. Given that most methods for radiative transport or either inaccurate or unfeasible, the derivation of this new method represents a novel and possibly paradigm-changing contribution to an accurate inclusion of radiation in numerical astrophysics.

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