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CATEGORIES:Quantum Fields and Strings Seminars
SUMMARY:Quantum Conformal Gravity - Philip Mannheim (Conne
cticut)
DTSTART;TZID=Europe/London:20180607T130000
DTEND;TZID=Europe/London:20180607T140000
UID:TALK105112AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/105112
DESCRIPTION:Conformal symmetry is a natural symmetry in physic
s since it is the full symmetry of the light cone.
If all particles are to get their masses by symme
try breaking then conformal symmetry is the symmet
ry of the unbroken Lagrangian. Like Yang-Mills the
ories conformal symmetry has a local extension\, n
amely conformal gravity\, a pure metric-based cand
idate alternative to the non-conformal invariant s
tandard Newton-Einstein theory of gravity. With it
s dimensionless coupling constant quantum conforma
l gravity is power counting renormalizable. Since
its equations of motion are fourth-order derivativ
e equations conformal gravity has long been though
t to possess unacceptable ghost states of negative
norm that would violate unitarity. However on con
structing the quantum Hilbert space Bender and Man
nheim found that this not to be the case. Conforma
l gravity is thus offered as a completely consiste
nt and unitary quantum theory of gravity\, one tha
t requires neither the extra dimensions nor the su
persymmetry of string theory. As formulated via lo
cal conformal invariance there is no intrinsic cla
ssical gravity\, with gravity instead being intrin
sically quantum-mechanical\, with the observed cla
ssical gravity being output rather than input. The
contribution of the graviton loops of conformal g
ravity enables conformal gravity to solve the cosm
ological constant problem. Like Yang-Mills the pot
ential of conformal gravity contains both a Newton
ian term and a linear potential. Together with a q
uadratic potential that the theory also contains c
onformal gravity is able to explain the systematic
s of galactic rotation curves without any need fo
r galactic dark matter. Since all mass is to be dy
namical there cannot be a fundamental double-well
Higgs potential in the theory. Instead\, the Higgs
boson is generated dynamically\, with the hierarc
hy problem then being solved.\n
LOCATION:Potter Room (first floor\, Pav. B)
CONTACT:Dr. Carl Turner
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