Susskind–Hawking battle: Difference between revisions
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The '''Susskind–Hawking battle''', also known as the '''black hole war''',<ref>[http://www.amazon.com/Black-Hole-War-Stephen-Mechanics/dp/0316016403 The Black Hole War]</ref> refers to the vigorous two-decade long debate<ref>[http://www.youtube.com/watch?v=uyI1SRot8dY Susskind vs Hawking]</ref> that Stanford University theoretical physicist [[Leonard Susskind]] had with cosmologist [[Stephen Hawking]] over the behavior of [[black hole]]s. Hawking argued that information is lost when black holes evaporate. Susskind found this idea so disturbing that "he publicly declared war",<ref>http://articles.latimes.com/2008/jul/26/science/sci-susskind26</ref> which he described in his book ''The Black Hole War: My battle with Stephen Hawking to make the world safe for quantum mechanics''. The solution to the problem that concluded the battle is the [[holographic principle]], which was first proposed by [[Gerardus 't Hooft]] but was given a precise [[string theory]] interpretation by Susskind. With this, as the title of an article puts it, "Susskind quashes Hawking in quarrel over quantum quandary".<ref>http://richarddawkins.net/articles/2846</ref> |
The '''Susskind–Hawking battle''', also known as the '''black hole war''',<ref>[http://www.amazon.com/Black-Hole-War-Stephen-Mechanics/dp/0316016403 The Black Hole War]</ref> refers to the vigorous two-decade long debate<ref>[http://www.youtube.com/watch?v=uyI1SRot8dY Susskind vs Hawking]</ref> that Stanford University theoretical physicist [[Leonard Susskind]] had with cosmologist [[Stephen Hawking]] over the behavior of [[black hole]]s. Hawking argued that information is lost when black holes evaporate. Susskind found this idea so disturbing that "he publicly declared war",<ref>http://articles.latimes.com/2008/jul/26/science/sci-susskind26</ref> which he described in his book ''The Black Hole War: My battle with Stephen Hawking to make the world safe for quantum mechanics''. The solution to the problem that concluded the battle is the [[holographic principle]], which was first proposed by [[Gerardus 't Hooft]] but was given a precise [[string theory]] interpretation by Susskind. With this, as the title of an article puts it, "Susskind quashes Hawking in quarrel over quantum quandary".<ref>http://richarddawkins.net/articles/2846</ref> |
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Revision as of 23:17, 27 November 2010
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The Susskind–Hawking battle, also known as the black hole war,[1] refers to the vigorous two-decade long debate[2] that Stanford University theoretical physicist Leonard Susskind had with cosmologist Stephen Hawking over the behavior of black holes. Hawking argued that information is lost when black holes evaporate. Susskind found this idea so disturbing that "he publicly declared war",[3] which he described in his book The Black Hole War: My battle with Stephen Hawking to make the world safe for quantum mechanics. The solution to the problem that concluded the battle is the holographic principle, which was first proposed by Gerardus 't Hooft but was given a precise string theory interpretation by Susskind. With this, as the title of an article puts it, "Susskind quashes Hawking in quarrel over quantum quandary".[4]
In July 2005, Stephen Hawking published a paper and announced a theory that quantum perturbations of the event horizon could allow information to escape from a black hole, which would resolve the information paradox. His argument assumes the unitarity of the AdS/CFT correspondence which implies that an AdS black hole that is dual to a thermal conformal field theory, is unitary. When announcing his result, Hawking also conceded the 1997 bet, paying John Preskill with a baseball encyclopedia "from which information can be retrieved at will". However, Kip Thorne, who had also argued that information is lost when black holes evaporate, remains unconvinced of Hawking's proof and declined to contribute to the award.
According to Roger Penrose, loss of unitarity in quantum systems is not a problem: quantum measurements are by themselves already non-unitary. Penrose claims that quantum systems will in fact no longer evolve unitarilly as soon as gravitation comes into play... like in black holes. The Conformal Cyclic Cosmology advocated by Penrose critically depends on the condition that information is in fact lost in black holes. This new cosmological model might in future be tested experimentally by detailed analysis of the cosmic microwave background radiation (CMB): if true the CMB should exhibit circular patterns with slightly lower or slightly higher temperatures. In November 2010, Penrose and V. G. Gurzadyan announced they had found evidence of such circular patterns, in data from the Wilkinson Microwave Anisotropy Probe (WMAP) corroborated by data from the BOOMERanG experiment.[5]
References
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