RX J1856−3754: Evidence for a Stiff Equation of State

2002 ◽  
Vol 580 (2) ◽  
pp. 1043-1047 ◽  
Author(s):  
Timothy M. Braje ◽  
Roger W. Romani
2021 ◽  
Vol 104 (12) ◽  
Author(s):  
Kazuo Ghoroku ◽  
Kouji Kashiwa ◽  
Yoshimasa Nakano ◽  
Motoi Tachibana ◽  
Fumihiko Toyoda

Universe ◽  
2018 ◽  
Vol 4 (2) ◽  
pp. 29 ◽  
Author(s):  
Hovik Grigorian ◽  
Evgeni Kolomeitsev ◽  
Konstantin Maslov ◽  
Dmitry Voskresensky

Entropy ◽  
2021 ◽  
Vol 23 (9) ◽  
pp. 1219
Author(s):  
Luis Herrera ◽  
Alicia Di Prisco ◽  
Justo Ospino

We study fluid distributions endowed with hyperbolic symmetry, which share many common features with Lemaitre–Tolman–Bondi (LTB) solutions (e.g., they are geodesic, shearing, and nonconformally flat, and the energy density is inhomogeneous). As such, they may be considered as hyperbolic symmetric versions of LTB, with spherical symmetry replaced by hyperbolic symmetry. We start by considering pure dust models, and afterwards, we extend our analysis to dissipative models with anisotropic pressure. In the former case, the complexity factor is necessarily nonvanishing, whereas in the latter cases, models with a vanishing complexity factor are found. The remarkable fact is that all solutions satisfying the vanishing complexity factor condition are necessarily nondissipative and satisfy the stiff equation of state.


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