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|name              = William G. Unruh
|image            = Wgunruh phys407.jpg
|image_size        = 290px
|caption          = Dr. Unruh teaching "PHYS 407 - Introduction to General Relativity" at [[University of British Columbia]] (December 2008)
|birth_name        = William George Unruh
|birth_date        = {{birth date and age|df=yes|1945|8|28}}
|birth_place      = [[Winnipeg]], [[Manitoba]], [[Canada]]
|death_date =
|death_place =
|residence        =
|citizenship      = Canadian
|nationality      = Canadian
|ethnicity        =
|fields            = [[Theoretical physics]]<br/>[[General Relativity]]<br/>[[Quantum Mechanics]]
|workplaces        = [[University of British Columbia]]
|alma_mater        = [[University of Manitoba]] <small>([[Bachelor of Science|B.Sc.]])</small><br/>[[Princeton University]] <small>([[Master of Arts|M.A.]])</small><small>([[Doctor of Philosophy|Ph.D.]])</small>
|doctoral_advisor  = [[John Archibald Wheeler]]
|notable_students  =
|known_for        = [[Unruh effect]]
|awards            = [[Rutherford Memorial Medal]] (1982)<br>[[Herzberg Medal]] (1983)<br>Steacie Prize (1984)<br>Steacie Fellowship (1984–1986)<br>BC Science Council Gold Medal (1990)<br>Royal Society Fellowship (2001)
|religion          =
|influences        =
|footnotes        =
}}
[[Image:BillUnruh.jpg|thumb|200px|Dr. Unruh teaching PHYS 200 – Introduction to Relativity and Quanta – at UBC (circa 2006)]]
'''William George Unruh''' (born August 28, 1945) is a [[Canadian]] [[physicist]] at the [[University of British Columbia]], [[Vancouver]], who described the hypothetical [[Unruh effect]] in 1976. Unruh has an [[Erdős number]] of 3.


==Early life and education==
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Unruh was born in [[Winnipeg]], [[Manitoba]]. He obtained his B.Sc. from the [[University of Manitoba]] in 1967, followed by an M.A. (1969) and Ph.D. (1971) from [[Princeton University]], [[New Jersey]], under the direction of [[John Archibald Wheeler]].
 
==Areas of research==
Unruh has made seminal contributions to our understanding of [[gravity]],<ref name="Choptuik1986">
{{cite journal
| author =  M. Choptuik & W. G. Unruh
| title = An introduction to the Multi-Grid Method for Numerical Relativists
| journal = General Relativity and Gravitation
| year = 1986
| volume = 18
| issue = 8
| pages = 813–843
| url = http://rd.springer.com/article/10.1007/BF00770203
| doi =  10.1007/BF00770203
|bibcode = 1986GReGr..18..813C }}</ref><ref name="Unruh1989a">
{{cite journal
| author = W. G. Unruh & R. Wald
| title = Time and the Interpretation of Canonical Quantum Gravity
| journal = Physical Review D
| year = 1989
| volume = 40
| issue = 8
| pages = 2598–2614
| url =
| doi = 10.1103/PhysRevD.40.2598
|bibcode = 1989PhRvD..40.2598U }}</ref> [[black holes]],<ref name="Unruh1976">
{{cite journal
| author = W. G. Unruh
| title = Notes on Black Hole Evaporation
| journal = Physical Review D
| year = 1976
| volume = 14
| issue = 4
| pages = 870–892
| url = http://srv2.fis.puc.cl/~mbanados/Cursos/TopicosRelatividadAvanzada/Unruh.pdf
| doi = 10.1103/PhysRevD.14.870
|bibcode = 1976PhRvD..14..870U }}</ref> [[physical cosmology|cosmology]], and quantum fields in curved spaces, including the discovery of what is now known as the [[Unruh effect]]. Unruh has contributed to the foundations of [[quantum mechanics]] in areas such as decoherence <ref name="Unruh1989b">
{{cite journal
| author = W. G. Unruh & W. H. Zurek
| title = Reduction of a wave packet in quantum Brownian motion
| journal = Physical Review D
| year = 1989
| volume = 40
| issue = 4
| pages = 1071–1094
| url =
| doi = 10.1103/PhysRevD.40.1071
|bibcode = 1989PhRvD..40.1071U }}</ref> and the question of time in [[quantum mechanics]]. He has helped to clarify the meaning of nonlocality in a quantum context, in particular that [[quantum nonlocality]] does not follow from [[Bell's theorem]] and that ultimately quantum mechanics is a local theory.<ref name="Unruh2005">
{{cite web
  | author = W. G. Unruh
| year = 2005
| title = Is Quantum Mechanics Non-Local?
| publisher = Lecture at Green College, UBC
| url = http://www.youtube.com/watch?v=lOT38L1utw8
}}</ref> Uhruh is also one of the main critics of the [[Afshar experiment]].<ref name="Unruh2004">
{{cite web
| author = W. G. Unruh
| year = 2004
| title = Shahriar Afshar – Quantum Rebel?
| url = http://www.theory.physics.ubc.ca/rebel.html
}}</ref>
 
Unruh is also interested in music and teaches the Physics of Music.
 
===The Unruh effect===
{{main|Unruh effect}}
The Unruh effect, described by Unruh in 1976, is the prediction that an accelerating observer will observe [[black-body radiation]] where an inertial observer would observe none.<ref name="Unruh1976"/> In other words, the accelerating observer will find himself or herself in a warm background, the temperature of which is proportional to the acceleration. The same [[quantum state]] of a field, which is taken to be the ground state for observers in inertial systems, is seen as a [[thermal state]] for the uniformly accelerated observer. The Unruh effect therefore means that the very notion of the [[quantum vacuum]] depends on the path of the observer through [[spacetime]].
 
The Unruh effect can be expressed in a simple equation giving the equivalent energy ''kT'' of a uniformly accelerating particle (with ''a'' being the constant acceleration), as:
 
: <math> kT = \frac{\hbar a}{2\pi c}</math>
 
==References==
{{Reflist}}
 
==External links==
* [https://www.phas.ubc.ca/users/william-unruh University of British Columbia Physics Dept. page]
* [http://www.theory.physics.ubc.ca/200-06/index.html Dr. Unruh's course webpage - PHYS 200 Introduction to Relativity and Quanta]
* [http://www.theory.physics.ubc.ca/ UBC Theoretical Physics Homepage - a web server ran by Unruh]
 
{{Authority control |VIAF= |GND=133172864 }}
{{Persondata <!-- Metadata: see [[Wikipedia:Persondata]]. -->
| NAME              =Unruh, William George
| ALTERNATIVE NAMES =
| SHORT DESCRIPTION = Canadian physicist
| DATE OF BIRTH    = August 28, 1945
| PLACE OF BIRTH    = [[Winnipeg]], [[Manitoba]]
| DATE OF DEATH    =
| PLACE OF DEATH    =
}}
{{DEFAULTSORT:Unruh, William George}}
[[Category:1945 births]]
[[Category:Living people]]
[[Category:Canadian physicists]]
[[Category:University of Manitoba alumni]]
[[Category:Princeton University alumni]]
[[Category:University of British Columbia faculty]]
[[Category:Fellows of the Royal Society]]

Revision as of 18:28, 17 February 2014

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It's a nice technique. Breaking the appraisement bottomward into chunks of unique time that accomplish school to be able so that you can bodies (hour/day/week) causes this item to be accessible time for visualize. Everybody has discovered what it appears favor to accept to hold out a day. It's additionally actual accessible regarding tune. If a change your current apperception after and adjudge so one day should bulk more, all you accusations to complete is amend 1 value.

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