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17 papers · 2 filters
Passing through the bounce in the ekpyrotic models
Jerome Martin, Patrick Peter, Nelson Pinto Neto +1
By considering a simplified but exact model for realizing the ekpyrotic scenario, we clarify various assumptions that have been used in the literature. In particular, we discuss th…
On the Wilson loop in the dual representation within the dual Higgs model with dual Dirac strings
V. A. Ivanova, N. I. Troitskaya
The vacuum expectation value of the Wilson loop in the dual representation is calculated in the dual Higgs model with dual Dirac strings. It is shown that the averaged value of the…
On free massless (pseudo)scalar quantum field theory in 1+1-dimensional space-time
M. Faber, A. N. Ivanov
We construct a consistent quantum field theory of a free massless (pseudo)scalar field in 1+1-dimensional space-times free of infrared divergences. We show that a continuous symmet…
Symmetries of topological field theories in the BV-framework
F. Gieres, J. M. Grimstrup, H. Nieder +2
Topological field theories of Schwarz-type generally admit symmetries whose algebra does not close off-shell, e.g. the basic symmetries of BF models or vector supersymmetry of the…
The Virtual Black Hole in 2d Quantum Gravity and its Relevance for the S-matrix
D. Grumiller
As shown recently 2d quantum gravity theories -- including spherically reduced Einstein-gravity -- after an exact path integral of its geometric part can be treated perturbatively…
Noncommutative spin-1/2 representations
J. M. Grimstrup, H. Grosse, E. Kraus +3
In this letter we apply the methods of our previous paper hep-th/0108045 to noncommutative fermions. We show that the fermions form a spin-1/2 representation of the Lorentz algebra…