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The Ekpyrotic universe: Colliding branes and the origin of the hot big bang

- J. Khoury, B. Ovrut, P. Steinhardt, N. Turok
- Physics
- 29 March 2001

We propose a cosmological scenario in which the hot big bang universe is produced by the collision of a brane in the bulk space with a bounding orbifold plane, beginning from an otherwise cold,… Expand

From big crunch to big bang

- J. Khoury, B. Ovrut, N. Seiberg, P. Steinhardt, N. Turok
- Physics
- 24 August 2001

We consider conditions under which a universe contracting towards a big crunch can make a transition to an expanding big bang universe. A promising example is 11-dimensional M-theory in which the… Expand

The Universe as a domain wall

- A. Lukas, B. Ovrut, K. Stelle, D. Waldram
- Physics
- 27 March 1998

It is shown that the effective five-dimensional theory of the strongly coupled heterotic string is a gauged version of N=1 five-dimensional supergravity with four-dimensional boundaries. For the… Expand

On the four-dimensional effective action of strongly coupled heterotic string theory

- A. Lukas, B. Ovrut, D. Waldram
- Physics, Mathematics
- 28 October 1997

Supersymmetry, supergravity, and particle physics

- B. Ovrut
- Physics, Education
- 20 June 1986

N = 1 global supersymmetry and supergravity are discussed using the superfield formalism. Supergravity particle physics theories are presented, emphasizing the role of gravitation in low energy… Expand

New Ekpyrotic Cosmology

- E. Buchbinder, J. Khoury, B. Ovrut
- Physics
- 20 February 2007

In this paper, we present a new scenario of the early universe that contains a pre-big bang ekpyrotic phase. By combining this with a ghost condensate, the theory explicitly violates the null energy… Expand

Standard Models from Heterotic M-theory

- R. Donagi, B. Ovrut, T. Pantev, D. Waldram
- Mathematics
- 21 December 1999

We present a class of N=1 supersymmetric models of particle physics, derived directly from heterotic M-theory, that contain three families of chiral quarks and leptons coupled to the gauge group… Expand

Higher-derivative chiral superfield actions coupled to N = 1 supergravity

- Michael Koehn, J. Lehners, B. Ovrut
- Physics
- 16 July 2012

We construct N=1 supergravity extensions of scalar field theories with higher-derivative kinetic terms. Special attention is paid to the auxiliary fields, whose elimination leads not only to… Expand

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