We study charged black hole solutions in 4-dimensional (4D) Einstein–Gauss–Bonnet–Maxwell theory to the linearized perturbation level. We first compute the shear viscosity to entropy density ratio. We then demonstrate how bulk causal structure analysis imposes an upper bound on the Gauss–Bonnet...
$$\begin{aligned} f(r)=1+\frac{r^2}{4\alpha }\left( 1-\sqrt{1-\frac{8\alpha }{l^2}+\frac{8\alpha m}{r^4}-\frac{8\alpha q^{2}}{3r^6}}\right) ,\nonumber \\ \end{aligned}$$ (28) which describes the charged AdS black hole solution in Einstein–Gauss–Bonnet gra...
7 Estimated number distribution of the Galactic detached black hole binaries with a (sub)giant companion in the plane of orbital period versus eccentricity. Only the systems with 3.1M⊙ < MBH < 4.1M⊙ and 1.7M⊙ < Mgiant < 3.7M⊙ are included. The top and bottom panels correspond ...
Compare this number with the acceleration of gravity at Earth's surface, 980 cm/s2. Clearly the tidal forces would stretch and squeeze the astronaut out of existence long before reaching the black hole's surface. There are more than 100 confirmed black holes among the celestial bodies presently...
Nature Astronomy volume 1, Article number: 0075 (2017) Cite this article 7818 Accesses 97 Citations 369 Altmetric Metrics details Abstract The appearance of supermassive black holes at very early times1–3 in the Universe is a challenge to our understanding of star and black hole formation. The...
(12)TODAY’S THING TO NOT WORRY ABOUT.AlthoughGizmodohas learned“Tiny Black Holes Could Have Left Tunnels Inside Earth’s Rocks”, they say “A pair of imaginative cosmologists have great news for everyone: If a primordial black hole tunnels through your body, you probably won’t die.” ...
Given a graph G with n nodes, some of which are black holes, and a number k of entities, the idea is to perform the exploration of G as fast as possible with the constraint that if an entity enters in a black-hole, then it is destroyed and the black-hole disappears. The objective...
number of accessible physical states in a quantum black hole, then the paradox can be seen as an instance of the fundamental problem of statistical mechanics. We suggest a specific analogy to the increase of the entropy in a solvation process. We further show that the huge phase volume (N)...
with a cosmological horizon, which are solutions of Lovelock gravity, determines that they must evolve either into a state where the black hole and cosmological horizons have reached thermal equilibrium or into an extreme black hole geometry where the black hole and cosmological horizons have merged...
On the number density of ‘direct collapse’ black hole seeds. Mon. Not. R. Astron. Soc. 463, 529–540 (2016). Article ADS CAS Google Scholar Chon, S., Hosokawa, T. & Yoshida, N. Radiation hydrodynamics simulations of the formation of direct-collapse supermassive stellar systems. Mon....