4-D simplicial quantum gravity interacting with gauge matter fields

Bilke, S.; Burda, Z.; Krzywicki, A.; Petersson, B.; Tabaczek, J.; Thorleifsson, G.

doi:10.1016/S0370-2693(97)01409-3

4-D simplicial quantum gravity interacting with gauge matter fields

Oct, 1997

10 pages

Published in:

Phys.Lett.B 418 (1998) 266-272

e-Print:

hep-lat/9710077 [hep-lat]

DOI:

10.1016/S0370-2693(97)01409-3

Report number:

BI-TH-97-41,
LPTHE-ORSAY-97-52

View in:

ADS Abstract Service

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Abstract:

The effect of coupling non-compact

U(1)

gauge fields to four dimensional simplicial quantum gravity is studied using strong coupling expansions and Monte Carlo simulations. For one gauge field the back-reaction of the matter on the geometry is weak. This changes, however, as more matter fields are introduced. For more than two gauge fields the degeneracy of random manifolds into branched polymers does not occur, and the branched polymer phase seems to be replaced by a new phase with a negative string susceptibility exponent

\gamma

and fractal dimension

d_H \approx 4

.

Note:

latex2e, 10 pages incorporating 2 tables and 3 figures (using epsf) Report-no: BI-TH-97/41, LPTHE Orsay 97/52

quantum gravity: simplex
gauge field theory: U(1)
gauge field theory: noncompact
coupling: effect
expansion: strong coupling
matter: back reaction
model: polymer
string model: susceptibility
lattice field theory
numerical calculations: Monte Carlo

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