What is Hawking: Definition and 329 Discussions

Stephen William Hawking (8 January 1942 – 14 March 2018) was an English theoretical physicist, cosmologist, and author who was director of research at the Centre for Theoretical Cosmology at the University of Cambridge at the time of his death. He was the Lucasian Professor of Mathematics at the University of Cambridge between 1979 and 2009.
Hawking was born in Oxford into a family of doctors. He began his university education at University College, Oxford, in October 1959 at the age of 17, where he received a first-class BA (Hons.) degree in physics. He began his graduate work at Trinity Hall, Cambridge, in October 1962, where he obtained his PhD degree in applied mathematics and theoretical physics, specialising in general relativity and cosmology in March 1966. In 1963, Hawking was diagnosed with an early-onset slow-progressing form of motor neurone disease that gradually paralysed him over the decades. After the loss of his speech, he communicated through a speech-generating device initially through use of a handheld switch, and eventually by using a single cheek muscle.
Hawking's scientific works included a collaboration with Roger Penrose on gravitational singularity theorems in the framework of general relativity and the theoretical prediction that black holes emit radiation, often called Hawking radiation. Initially, Hawking radiation was controversial. By the late 1970s and following the publication of further research, the discovery was widely accepted as a significant breakthrough in theoretical physics. Hawking was the first to set out a theory of cosmology explained by a union of the general theory of relativity and quantum mechanics. He was a vigorous supporter of the many-worlds interpretation of quantum mechanics.Hawking achieved commercial success with several works of popular science in which he discussed his theories and cosmology in general. His book A Brief History of Time appeared on the Sunday Times bestseller list for a record-breaking 237 weeks. Hawking was a Fellow of the Royal Society, a lifetime member of the Pontifical Academy of Sciences, and a recipient of the Presidential Medal of Freedom, the highest civilian award in the United States. In 2002, Hawking was ranked number 25 in the BBC's poll of the 100 Greatest Britons. He died on 14 March 2018 at the age of 76, after living with motor neurone disease for more than 50 years.

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  1. H

    Einstein & Hawking: Delivering Theories Without Experiments?

    Suppose I am simple man, who studies in home and read some scientific journals . Could I be able to deliver some theories(and would it be possibly correct ?. Would I have to be engaged in big laboratories consiting super computers, advance telescopes etc? How was eeinstein became able to...
  2. Y

    Stephen Hawking fools people using massive words instead of mathematics.

    Here is a question I put in Yahoo Answers: As I said earlier in another thread in this board, I am not a mathematician, here. Just the same I can think and I believe that I can see foolery when I see it and think about it. What do you mathematicians here say about my question...
  3. P

    When does Hawking radiation begin?

    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...
  4. Y

    The Grand Design - Stephen Hawking and Leonard Mlodinow

    I've been wanting to read the book lately but before I do, I wish that some can give me a preview of what's ahead. What will be the major/interesting points of the books for someone like me who is just very interested with astrophysics and cosmology but doesn't have a lot of physics...
  5. PhanthomJay

    What is the relationship between mathematical structures and real existence?

    I haven't got a copy of Hawking's new book yet ('The Grand Design'), hoping I'll get it as a Christmas present :wink:. But i was quickly thumbing through it (mosly the side flaps) at the bookstore yesterday, and Hawking seems to subscribe to the 'Sum of Histories' theory (?), where the Universe...
  6. E

    Hawking radiation redshift (?)

    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...
  7. H

    I don ` t understand Hawking` s answer to Why this particular set of laws? .

    I don ` t understand Hawking` s answer to "Why this particular set of laws?". I read the book the grand design by Stephen Hawking. The book at the beginning say it attempts to answer three questions. The questions are: 1."Why is there something rather than nothing?" 2."Why do we exist?" 3."Why...
  8. T

    What happens when two of the evanescent particles that Hawking

    Hello, I didn't know where else to ask this, but I'm quite curious. What happens when two of the evanescent particles that Hawking describes, pop into existence at the same place and the same instant effectively overlapping each other? The source that sparked this question...
  9. P

    Analog of Hawking Radiation Observed?

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

    Hartle Hawking offer probabilities for observations (eternal inflation picture)

    Hartle Hawking suggest probabilities for observations (eternal inflation picture) http://arxiv.org/abs/1009.2525 Eternal inflation without metaphysics James Hartle, S.W. Hawking, Thomas Hertog 4 pages (Submitted on 13 Sep 2010) "In the usual account of eternal inflation the universe is...
  11. G

    When The Stephen Hawking Young and Walking

    When i surf internet, i have meet a photo about Stephen Hawking and i have surprised when saw the Stephan Hawking standing. http://bit.ly/9VXk0Y
  12. E

    Hawking and Spontaneous Creation

    Okay, I've heard that in Stephen Hawking's new book, The Grand Design, he claims that the law gravity somehow created the universe from nothing. Can any of you give me a conceptual understanding of how this could occur?
  13. bcrowell

    Hawking singularity theorem - what if not all geodesics incomplete?

    Hawking singularity theorem -- what if not all geodesics incomplete? The Penrose singularity theorem tells us that once you get a trapped surface, at least one geodesic is guaranteed to be incomplete, going forward in time. But this doesn't mean that 100% of the mass of a collapsing star has to...
  14. Q

    Hawking radiation & quarks/gluons

    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...
  15. K

    How Does Hawking Radiation Affect Black Hole Mass?

    I've read as much on the subject as I can before getting into the actual math of it, so I need people who know the subject better then I do to answer my question. The way I understand it, at the quantum level, particle/anti-particle pairs are created all the time and annihilate before they...
  16. N

    Should I Attend Hawking's Lecture on the Grand Design?

    Hello, I've heard Hawking is giving a lecture this october in England (I myself am a Belgian) and I was wondering if it's worth the trouble to attend it? I'm a 2nd year college student and passionate about physics, but Hawking has never really gripped me, but that's maybe because I don't know...
  17. S

    Susskind and Hawking on hard determinism

    Does anyone know the stances of prominent physicists (Susskind, Hawking, others) on hard determinsm?
  18. E

    Does string theory/LQG predict Hawking radiation?

    Actual experimental aparatus, measurements and all that, see figure 2 on page 6 http://arxiv.org/abs/1008.1911 Measurement of stimulated Hawking emission in an analogue system Silke Weinfurtner, Edmund W. Tedford, Matthew C. J. Penrice, William G. Unruh, Gregory A. Lawrence (Submitted on 11 Aug...
  19. stevebd1

    Derivation of Hawking Radiation

    I'm not quite sure how reliable http://library.thinkquest.org/C007571/english/advance/core4.htm" as a source but I thought it provided a good derivation for the Hawking Radiation equation relative to the Heisenberg uncertainty principle- First the energy of the radiation is established-...
  20. S

    Stephen Hawking Books: Use for Engineering Benefits

    Recently on my high school graduation an engineer uncle of mine gave me two books by hawking 1)God created the integers 2)On the shoulders of giants I have gone through the books but could not understand how will they be helpful in engineering please guide me how to use them to my benefit
  21. T

    Hawking On The Edge Of The Universe

    If Hawking's model is correct then the universe could be regarded as a causally closed system, uncreatable and indestrucible.
  22. R

    Other universes vs Hawking radiation

    So, when you plunge into a rotating black hole, according to penrose diagram one could travel to different universes, but at the same time black holes emit particles by hawking radiation. So what happens to an object inside the black hole? Do I make an error in reasoning somewhere?
  23. N

    Is Stephen Hawking's Take on Aliens as Funny as We Hoped?

    For a [humorous let's hope] view from Stephen Hawking on alien life, check out: http://www.timesonline.co.uk/tol/news/science/space/article7107207.ece
  24. F

    Alternative to "God Created the Integers" by Stephen Hawking

    Alternative to "God Created the Integers" ~ Stephen Hawking Hi! I was thinking about buying a decent book covering the history of mathematics (from a fairly technical point of view), and "God Created the Integers" by Stephen Hawking seemed to be the perfect book. However, after having read some...
  25. D

    Opinions Sought on Hawking Radiation and High Energy Collisions

    Can someone give some opinions on the following? The 2 main arguments from this site i can tell are: that hawking radiation isn't proven. And that high energy collisions in the upper atmosphere travel at a fast speed & the small black holes can escape from Earth unlike in the lhc. I...
  26. C

    Hawking Radiation & Parity Imbalance: Matter vs. Anti-Matter

    Does Hawking radiation account for the parity imbalance between matter and anti-matter? Do Black Holes create matter? If a matter/anti-matter pair materializes on either side of the event horizon of a black hole: 1) if the matter particle is on the inside of the event horizon, the mass of the...
  27. K

    What are the unanswered questions about Hawking radiation and the Unruh effect?

    1)when hawking first propounded this thermal radiation, he took into acount the the gravitational cllapse. so I am not sure, if we consider a stationary system, then there won't be any particle creation. Is this the case? because I think there will not be any mixing of posive and negative...
  28. rhody

    Hawking to leave Cambridge in protest over budget cuts, heading to Perimeter

    Score one for Perimeter, it would be great if Hawking Radiation is confirmed so he could receive a Nobel and be recognized before his health fails him. http://www.dailymail.co.uk/news/article-1254945/Stephen-Hawking-plans-leave-Britain-Government-cuts-science.html"
  29. C

    The True Nature of Hawking Radiation

    With the theory of Hawking Radiation, people generally say to imagine that the black hole has a temperature, so it must radiate heat. But, this really is not how it is said to work. The means by which the black hole evaporates is not that particles are actually coming out of it, or that it is...
  30. srfriggen

    Hawking Radiation: Mass & Decay Rate

    Posted this on the Astrophysics page but I think it is more appropriate here... Last night in my calculus class I learned about radioactive decay, a nice example using radium. I was taught that the smaller the mass, the slower the rate of decay (or at least that's what I absorbed, I still...
  31. srfriggen

    Hawking Radiation: Rate of Decay & Mass

    Last night in my calculus class I learned about radioactive decay, a nice example using radium. I was taught that the smaller the mass, the slower the rate of decay (or at least that's what I absorbed, I still have to go over my notes again. Or does the rate not change, but the time it takes...
  32. D

    Technical question about Hawking radiation

    I see how it is derived for the BH and in case of Unruh effect. In Unruh effect it is a function of acceleration In case of BH distance to the event horizon plays important role What I can't find, however, how tidal forces should be taken into account. For example, in the universe with DE...
  33. J

    Practical possibility of Hawking radiation?

    i have long been a skeptic of hawking radiation. i would like to explore my concerns, and see what your reaction is. the concept hinges around the idea of a spontaneous particle pair being created somewhere near the EH of a BH. radiation would occur if one of the particles manages to escape...
  34. W

    Stephen Hawking: Communicating with the World?

    Hi All, Is Stephen Hawking still able to communicate with the outside world or has he become totally incommunicado? If he is able to communicate, is he still contributing to the field? Thank you, Bob
  35. P

    Does Hawking deserve a Nobel prize for his singularity theorem?

    Hawking radiation is almost certainly not going to win him a Nobel prize, because experimental detection is beyond our technology. But how about the singularity theorem which he and Roger Penrose proved? This theorem convinced the physics community that black hole would indeed form in realistic...
  36. M

    Understanding "Linearity" in Hawking & Ellis' Subspace of T_p

    I'm reading Hawking and Ellis, and on p.16 they say that "The subspace of T_p defined by \langle \omega,x \rangle=(constant) for a given one-form \omega, is linear." But in what sense is this true? For if the constant is non-zero, the 0 of T_p is not in the subspace, nor does it satisfy...
  37. Ranku

    Exploring the Temperature Differential of Hawking Radiation

    Hawking radiation is supposed to emanate from black holes because black holes have a temperature. A black hole has to be about 3 times the solar mass. A black hole with a few times the mass of the sun would have a temperature of only one ten millionth of a degree above absolute zero. This is...
  38. M

    Why Hawking radiation contains other particles besides photon?

    Hawking radiation is standard thermal spectrum, thermal spectrum means it only can emit photon. why Hawking radiation contains other particles?(electron neutrino neutron proton etc)
  39. J

    More Hawking radiation misinformation

    typical poor science reporting on our national media - this time about HR on msnbc.com: http://www.msnbc.msn.com/id/32781964/ns/technology_and_science-science the article states: "Contrary to popular belief, black holes do not suck up absolutely everything around them. They actually emit a...
  40. C

    Hawking Radiation: How Do Black Holes Emit?

    if light cannot escape a black hole then how do they emit stuff called hawking radiation.
  41. E

    Why does Stephen Hawking omit all mention Loop Gravity?

    Why does Stephen Hawking omit all mention Loop Gravity? I have read his popular books from Brief history of time to Universe in a nuthsell to "Stephen Hawking and the Theory of Everything" Stephen Hawking's Universe A Briefer History of Time From what I recall, he absolutely spends...
  42. J

    Crossing event horizon and Hawking radiation

    Some thought experiments and questions. I would much appreciate any comments on whether my analyses below are correct. 1. I am falling feet first into a black hole. An external observer will never see me fall past the event horizon. However, in my frame of reference I will fall past it in...
  43. J

    2 Q's - hawking radiation and inflationary universe

    Q1 - hawking radiation hinges around spontaneous particle pair creation near the EH of a BH. the spontaneous pair can only exist for less than the Planck time. how can either of the particle pair travel a far enough distance in that ridiculously small amount of time to actually cross the EH...
  44. S

    How is Hawking Radiation Related to a Black Hole's Mass and Time of Dissipation?

    How exactly is the amount of Hawking radiation emitted by a black hole related to it's mass/Schwarzschild radius/etc? Is there a formula relating the two for instance? (I'm trying to calculate the time it would take for one of the LHC black holes that will supposedly destroy the Earth - ad...
  45. M

    Hawking radiation: why only one way?

    I'm trying to understand how Hawking radiation works but, as usual, most explanations are oversimplified so they don't appear to make sense. If I understood correctly, pairs of particles and antiparticles pop into existence everywhere in the universe all the time, and usually annihilate each...
  46. S

    The Hawking 4D closed manifold

    Hi, I am struggling to understand Stephen Hawking's view of the universe as a 4D closed manifold. In a recent interview, I believe he had this to say: What I don't understand is how this theory is compatible with the scientific observation that the universe is expanding? I have 2 questions: 1)...
  47. Ivan Seeking

    Stephen Hawking "Very Ill" in Hospital

    Hawking "very ill" http://www.google.com/hostednews/afp/article/ALeqM5jiBccToRoUY5q5S43UgUN8XUzHBw
  48. O

    Black Holes and Hawking Radiation: The Time Dilation Paradox

    I have a question concerning black holes and hawking radiation. I hope it is an adequate question and I pose it in the right section. Consider a free-falling observer 1 approaching the event horizon of a black hole. Evaluating his proper time, one finds that he crosses the event horizon...
  49. B

    Does Stephen Hawking give autographs?

    I'm going to a talk he's giving tonight, and I don't want to offend him somehow. I also don't know if he actually can, practically speaking...
  50. K

    Understanding Stephen William Hawking's Theories on Black Holes

    i will like to know whether Stephen William Hawking's theories about the black hole...because i was a ordinary person who want to know what is black hole is about...because i see a lot of articles about black hole but none of it i can understand so i hope somebody here can help me out by explain...
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