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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Crystalline gravity - 't Hooft\, G (Utrecht)
DTSTART;TZID=Europe/London:20090327T140000
DTEND;TZID=Europe/London:20090327T150000
UID:TALK17561AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/17561
DESCRIPTION:Matter interacting classically with gravity in 3+1
dimensions usually gives rise to a continuum of d
egrees of freedom\, so that\, in any attempt to qu
antize the theory\, ultraviolet divergences are ne
arly inevitable. We now decided to investigate mat
ter of a form that only displays a finite number o
f degrees of freedom in compact sections of space-
time. In finite domains\, one has only exact\, ana
lytic solutions. This is achieved by limiting ours
elves to straight pieces of string\, surrounded by
locally flat sections of space-time. We investiga
te the equations of motion for such forms of matte
r. Globally\, the model is not finite\, because so
lutions tend to generate infinite fractals. The mo
del is not (yet) quantized\, but could serve as an
interesting setting for\nanalytical approaches to
classical general relativity\, as well as a possi
ble stepping stone for quantum models. Details of
its properties are explained\, but some problems r
emain unsolved\, such as a complete description of
all possible interactions.
LOCATION:Seminar Room 1 Newton Institute
CONTACT:Mustapha Amrani
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