Hawking radiation Definition and 209 Threads

So as I understand it, Hawking theorized that due to the behaviour of virtual particles on the event horizon of a black hole, eventually the black hole would "evaporate" through what was coined the Hawking Radiation. But what I'm curious about is Hawking's interpretation of the event in that...

Here is my understanding, please correct me if I made any mistake Quantum physics theory suggests that information (the wave function, state, etc.) cannot be destroyed. All matters fall into a black hole will not be able to escape, which means all information of these particles stay inside...

Hawking Radiation and the "Decay" of Black Holes I have been doing a lot of reading and thinking about certain quantum mechanics so that I can try and wrap my head around how it all works. However I have come upon something that I cannot find a good explanation for. I was reading about...

Does the existence of observer dependent particles as predicted by the Unruh effect and Hawking radiation lead to paradoxes?

say you measured every particle which has entered a black hole say you measured every hawking radiation particle which exits the black hole my understanding is that if like... a proton enters the black hole, then an anti-proton needs to be emitted via hawking radiation. so if you measure...

From what I understand, Hawking radiation results when one virtual particle (of the pair) falls into the black hole while the other escapes... See I understand why the virtual particles don't come back together - because one is created beyond the horizon while the other is not. But how...

So as I understand it Stephen Hawking and one other person I can't remember the name of worked on an equation to described the "temperature" of a black hole, that you can actually get information out of it. I know that there is one way it could happen with those vacuum particles in vacuum energy...

Hello All, I have been trying to understand the exact contribution of our legendary physicist, Dr.Hawking and found that Hawking radiation is amongst one. Is it that Hawking radiation is the first attempt to unify, general relativity, quantum mechanics and thermodynamics which led to the...

Hi all, to begin this is my understanding of hawking radiation. A particle/anti-particle pair is generated. one particle outside the event horizon of a black hole, the other inside. The gravitational force "boosts" the one particle into being real. this energy is compensated for by endowing...

Hi all, I was wondering if, when a beam of light is pulled towards a black hole , because it can't accelerate, it is blueshifted? Thanks in advance.

The hypothetical Hawking radiation means that a set of baryons can be finally transformed, "evaporate" into a massless radiation - that baryons can be destroyed. It requires that this matter was initially compressed into a black hole. If baryons can be destroyed in such extreme conditions, the...

Hi, I've tried several times to get my head around this, but every way I look at it Hawking Radiation doesn't seem to fix the thermodynamic issues it was supposed to solve. People who are a lot smarter than me seem to believe it's real, so can someone please point out where I'm going wrong...

I was wondering whether anyone could provide an explanation as to why when two particles are created near the event horizon, only the negative energy particle is captured by the black hole, and the positive particle travels outward and is seen as Hawking Radiation. I have read numerous posts...

The solution of Einstein's field equations for a simple black hole show a slowing of time as you get close to the black hole. Time stops at the event horizon. An observer in flat spacetime far from the hole would see an astronaut fall slower and slower as he approaches the event horizon. It...

When the 'evaporation' of a black hole supposedly occurs, it is always attributed to 'Hawking radiation.' As I understand it, Hawking radiation occurs when a virtual particle pair is 'split' at the exact edge of an event horizon. When this occurs, one of the particle pair escapes to 'normal'...

Hi. If the hawking radiation is emitted from outside the event horizon , because probably that's the last place where the particles are being able to escape, then how come huge black holes ever evaporate as the matter behind event horizon has no chance of escaping in any way as to the immense...

Why is it that the smaller a black hole is, the more Hawking radiation it emits? It seems counterintuitive to me. I would think that a larger black hole with a larger surface area would trap more antiparticles from virtual particle antiparticle pairs, hence emitting more Hawking radiation.

Discussions involving Hawking radiation in the study of black holes usually require their preexistence; however, if we apply the Hawking radiation process to the initial stages of a birthing black hole I'm confused about how the theory claims the event horizon would form in the first place. In...

As I understand it, as a particle is observed approaching an event horizon, will would never be observed to cross the horizon, and it's red shift would tend towards infinity. I've read conflicting things about this, A, that that red shift WOULD NOT reach infinity in a finite time, and B, that...

I've seen it said somewhere that an observer falling into a black hole doesn't notice anything qualitatively unique at the exact moment they cross the event horizon. Does this include Hawking radiation? That radiation is described as being emitted by the event horizon, so once the observer...

I know their is a theoretical answere to this or else the theory would have no traction... If a black hole emits a particle at a high speed, wouldn't logic say that the black holes immense gravity simply pull it back in? Also, what kind/size particle is theorized to eject?

What's the "color" of Hawking radiation? If I understand correctly, the Hawking radiation hypothesis predicts that if a pair of virtual particles appears very close to the event horizon of a black hole, it may happen that one of them falls into the black hole and the other escapes, becoming a...

on pg 324 of Schutz's "A First Course in General Relativity", i am having a little trouble with the integral (11.100). the book says that to first order in \epsilon , the answer should be 2\sqrt{2M\epsilon} but i keep getting \sqrt{2M\epsilon} . i am missing that factor of 2 somehow. the...

In order for the black hole to evaporate it must have a temperature greater than that of the present-day black-body radiation of the Universe. Cosmic microwave background radiation temperature: T_u = 2.725 \; \text{K} Hawking radiation temperature: T_H = \frac{\hbar c^3}{8 \pi G M k_B}...

The Hawking-Unruh temperature is given by the expression: \large T = \frac{\hbar g}{2 \pi c k} where g is the gravitational acceleration at the surface of a black hole. Does this expression imply that any gravitating body will emit Hawking radiation? For example if we take the...

According to Hawking Radiation, a black hole if left alone will eventually evaporate. As the black hole loses mass the area of the event horizon shrinks until both are gone. The Hologram Theory says that as matter falls past the event horizon all the information pertaining to that matter is...

Micro black holes should in principle be observable by emitting Hawking radiation. However, as this takes place extremely close to the event horizon, shouldn't one expect then extreme redshifting (z = 1/(1-Rs/R)^-1/2 -1, Rs = Schwarzschildradius, R = Radius of Emission) and time dilatation? In...

I understand that to obey conservation that the black hole must lose energy and mass and the surrounding space must gain an equal amount of energy and mass. Then why can the antiparticle not be emitted from the black hole, adding negative energy and mass to the surrounding space, and the...

I know that Hawking Radiation is caused by the separation of virtual particles on the event horizon of a black hole, but I do not understand why the antiparticle is always the particle from the pair that falls into the black hole. It seems to me that the gravitational effects of the black hole...

I was wondering if virtual anti particles had a postulated anti gravitational charge if that would be inconsistent with Hawking radiation as virtual anti particles would always be ejected from the vicinity of the Schwarzschild radius whereas virtual particles may or may not be ejected depending...

So from what I understand when the particle anti-particle pairs that are constantly being created and annihilated come into existence near a black hole's horizon, the nearer one can get sucked in while the further one can radiate off as though it were heat. And this radiation of energy decreases...

i have read about Hawking's theory of BH radiation based on the idea of spontaneous particle pair creation at the EH wherein, on occasion, one of the particles is absorbed by the BH while the other escapes to become real. since the one which is absorbed is always of negative energy (whatever...

My (very basic) understanding of at least some form of Hawking Radiation is that, upon the formation of a particle/anti-particle pair near the event horizon, the black hole sucks in an anti-particle leaving the non-paired particle to go off into the universe as "radiation." But what about the...

Hi PF I was wondering, if Hawking radiation could have a different source than black-body radiation. I was wondering, if quantum tunneling could be a possible way, for energy to slip out of the grasp of the black holes gravitational attraction and slip through the event horizon. Would this be...

Can anybody help me with the original calculations of hawking radiation. I am working out the details of Hawking's original paper on black hole radiation. I am getting stuck at many places. Does anyone know about some place where the detailed calculations can be found.

Has hawking radiation ever been observed?

What is the equation for the energy/frequency of Hawking radiation emitted from a black hole? Thank you in advance! EDIT: I found this http://library.thinkquest.org/C007571/english/advance/core5.htm but the website doesn't seem to be a legitimate source and it doesn't give the derivation of the...

I stumbled upon an article while doing some research that had a statement saying that Hawking radiation can be found in places beyond black hole horizons. This lead me to this paper (which I'm not actually interested in beyond it's reference to the existence of hawking radiation outside of...

how can hawking radiation escape from a black hole? thanks

In his theory, Stephen Hawking suggests that a black hole will give off thermal radiation. Radiation is light, so how can light escape the gravity of a black hole, especially originating from one? The only way I could see this was that if radiation were traveling beyond the speed of light, but...

Is it true to say that Hawking radiation isn't actually the temperature of the black hole but rather, the temperature of the thermal radiation it emits due to quantum effects? Thanks.

i have posted a few questions regarding Hawking radiation in the past, regarding the assumption of "negative energy" of the particle which falls into the BH. i have tried to do as much reading as i can on the topic, since i have had a very hard time absorbing the concept of negative energy...

I was having a conversation with a physicist on Facebook (author of a book I rather enjoyed - "Users guide to the universe"), and he let the conversation end without my question ever being fully answered. Perhaps someone here can help explain this to me. I'll paste the entire conversation...

My understanding of Hawking Radiation is that a particle and anti-particle form at the event horizon, the particle escapes, the anti-particle goes into the black hole, annihilates a particle at the core of the black hole, and energy is released, leading to an evaporating black hole. But how do...

I read about Hawking Radiation a while ago (Scientific American?), and just thought of something that seems to not agree with it: Unless my memory is wrong, then at the event horizon the virtual particle pairs of the "vacuum" are split, and the anti-particle falls into the black hole, and the...

On "when does Hawking radiation begin?" I have wondered about when, during collapse, Hawing radiation starts (given that an outside observer never sees the horizon reached, classically at least), and asked this here without getting answers (presumably, because there is no well founded answer)...

This question has bothered me sometimes. For 'standard' black hole with an event horizon, an external observer never sees matter cross the horizon (or get any signal from inside); while an infalling observer crosses the horizon and, for a very big black hole, may not even notice any extreme...

I think it was proven that firing a photon (laser) straight up from the surface of Earth did in fact redshift the photon and decrease its frequency. And now, when we consider a black hole and Hawking radiation... I mean - the gravity inside the event horizon is so strong that EM cannot escape...

Didn't see a post about this yet. http://arxiv.org/abs/1009.4634

The theory of "Hawking radiation" says that black holes can emit different particles. We have a particle-antiparticle pair and one of them falls into the black hole while the other one escapes. On the other hand, we know that particles with color charge like quarks or gluons cannot travel...