9 papers
Confinement and Mass Gap in Abelian Gauge
U. Ellwanger, N. Wschebor
First, we present a simple confining abelian pure gauge theory. Classically, its kinetic term is not positive definite, and it contains a simple UV regularized F^4 interaction. Thi…
The Cosmological Constant
U. Ellwanger
Various contributions to the cosmological constant are discussed and confronted with its recent measurement. We briefly review different scenarious -- and their difficulties -- for…
Solvable Confining Gauge Theories at Large N
U. Ellwanger, N. Wschebor
In this letter we consider models with N U(1) gauge fields together with N Kalb-Ramond fields in the large N limit. These models can be solved explicitely and exhibit confinement f…
Confinement with Kalb - Ramond Fields
U. Ellwanger, N. Wschebor
We consider models with N U(1) gauge fields A_μ^n, N Kalb-Ramond fields B_{μν}^n, an arbitrary bare action and a fixed UV cutoff Λ. Under mild assumptions these can be obtained as…
Cosmological evolution in compactified Horava-Witten theory induced by matter on the branes
U. Ellwanger
The combined Einstein equations and scalar equation of motion in the Horava-Witten scenario of the strongly coupled heterotic string compactified on a Calabi-Yau manifold are solve…
Constraints on a Brane-World from the Vanishing of the Cosmological Constant
U. Ellwanger
We derive the analogue of the vanishing of the cosmological constant in 3+1 dimensions, T_0^0 = 0, in terms of an integral over components of the energy-momentum tensor of a 4+1 di…