Exploring Black Hole Anatomy: The Singularity, Event Horizon, and ...
2012年3月3日 · An additional thing to note is that charged and rotating black-holes have singularities that aren't points. A rotating black hole (called a "Kerr black hole") actually has a torus-shaped singularity (again, according to GR) with a finite, calculable size.
Exploring Black Hole Anatomy: The Singularity, Event Horizon, and ...
2012年3月3日 · It was specifically in reference to your comment that: That is, the time dilation may be so severe that the matter inside the event horizon just doesn't have enough time to collapse any significant amount before the black hole evaporates. Those studies have shown singularity formation in...
Challenging the notion of "crossing" a black hole's event horizon
2024年11月27日 · This becomes particularly interesting when considering photons directed straight toward a black hole. Since photons don't experience proper time and always travel at c, the time dilation argument might not apply in the same way. However, incoming photons would experience increasingly extreme blue-shifting as they approach the horizon.
The evaporation of charged black holes - Physics Forums
2024年11月12日 · They are extending the semiclassical model used by Hawking to deduce Hawking radiation, by a form of AdS/CFT ("JT gravity") that describes the wormhole-like throat around the event horizon, in order to describe the gravitational backreaction of the Hawking radiation on the black hole geometry (something neglected in the semiclassical …
The initial density of an object and its compression into a black hole
2024年12月5日 · The other day, a friend and I had a discussion about black holes, namely how the density of a body affects the process of its transformation into a black hole. My friend and I have too little collective knowledge in the field of theoretical physics regarding black holes, so the discussion has reached an impasse.
Is 1 e33 kg the Minimum Mass of a Black Hole? - Physics Forums
2004年12月9日 · If a black hole has less than the minimum mass, it cannot form and will instead remain a neutron star or white dwarf. This is because the gravitational force is not strong enough to overcome the electron degeneracy pressure. Can a black hole have a mass greater than the minimum? Yes, a black hole can have a mass greater than the minimum.
Surface gravity (Killing vecotrs) of Kerr black hole - Physics Forums
2014年4月14日 · The surface gravity of a Kerr black hole is different from that of a non-rotating black hole because the Kerr black hole has a larger event horizon due to its angular momentum. This results in a weaker gravitational pull at the event horizon, hence a lower surface gravity. Can the surface gravity of a Kerr black hole be measured? It is not ...
Does light bend around black holes? - Physics Forums
2024年10月21日 · The black circle in the middle represents the optical size of the black hole, i.e., if you send a light signal in that direction, it will end up inside the black hole. By time reversal, no light can come from that direction (unless emitted by something in …
Is Time Travel Possible Near Black Holes? - Physics Forums
2024年11月17日 · The more the mass the more the curvature in space time the more the gravity and slower the time. Time dilation above event horizon of black hole. Time for the observer near black hole = Time for the observer near earth x square root of (1 - (2Gm)/(rc²)). But time for that observer near black hole will still tick normally in clock will not stop.
Is Measuring the One-Way Speed of Light Possible Near a Black …
2024年11月6日 · Because of this, a traditional one-way speed measure (i.e. a clock and a laser a known distance away from another synchronised clock with a photodetector) dropped laser-end-first into a black hole could, with careful timing, have both its emission and reception events on the horizon and a light path tangential to the horizon.