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- Michael Bershadsky, Andrei Johansen
- 1998

We consider certain orbifoldization of the N = 4 field theories that leads to N = 2, 1, 0 field theories in 4 dimensions. These theories were recently analyzed using the string theory perturbationâ€¦ (More)

- Michael Bershadsky, Andrei Johansen, Tony G. Pantev, Vladimir Sadov
- 1997

Branches of moduli space of F-theory in four dimensions are investigated. The transition between two branches is described as a 3-braneâ€“instanton transition on a 7-brane. A dual heterotic picture ofâ€¦ (More)

- Andrei Johansen
- 1996

We study some aspects of enhanced gauge symmetries in F-theory compactified on K3. We find open string configurations connecting various 7-branes which represent stable BPS states. In this approachâ€¦ (More)

By considering a (partial) topological twisting of supersymmetric Yang-Mills com-pactified on a 2d space with 't Hooft magnetic flux turned on we obtain a supersymmetric Ïƒ-model in 2 dimensions. Forâ€¦ (More)

- Andrei Johansen
- 1994

It is shown that D = 4 N = 1 SUSY Yang-Mills theory with an appropriate supermultiplet of matter can be twisted on compact KÃ¤hler manifold. The conditions of cancellation of anomalies of BRST chargeâ€¦ (More)

- M. Bershadsky, Andrei Johansen, Tony G. Pantev, Vladimir Sadov, Cumrun Vafa
- 1996

We consider geometric engineering of N = 1 supersymmetric QFTs with matter in terms of a local model for compactification of F-theory on Calabi-Yau fourfold. By brining 3-branes near 7-branes weâ€¦ (More)

- M. Bershadsky, Andrei Johansen
- 1997

We study F-theory on elliptic threefold Calabi-Yau near colliding singularities. We demonstrate that resolutions of those singularities generically correspond to transitions to phases characterizedâ€¦ (More)

We present an explicit method for translating between the linear sigma model and the spectral cover description of SU(r) stable bundles over an elliptically fibered Calabi-Yau manifold. We use thisâ€¦ (More)

The space of static finite-energy configurations in the electroweak theory admits a Z2 topological structure. More precisely, we show that this space contains two disconnected sectors of unstableâ€¦ (More)

- L. Lukaszuk, Elliot Leader, Andrei Johansen
- 1999

Contour gauges, canonical formalism and flux algebras. Federation We would like to dedicate this paper to the memory of our dear friend and colleague Alyosha Anselm. Abstract A broad class of contourâ€¦ (More)