We consider a picture in which the transition from a big crunch to a big bang corresponds to the collision of two empty orbifold planes approaching each other at a constant non-relativistic speed in a locally flat background space-time, a situation relevant to recently proposed cosmological models. We show that p-brane states which wind around the extra dimension propagate smoothly and unambigu...

This study proposes a swarm optimizer with modified feasible-based mechanism approach for finding an optimum design steel frames. The proposed optimization addresses the problem of stagnation possibility in traditional particle which none particles tries to explore position better than previous best multiple numbers iterations. method is based on accelerated and big bang–big crunch algorithms. ...

We consider quantum field theory on a spacetime representing the Big Crunch/Big Bang transition postulated in ekpyrotic or cyclic cosmologies. We show via several independent methods that an essentially unique matching rule holds connecting the incoming state, in which a single extra dimension shrinks to zero, to the outgoing state in which it re-expands at the same rate. For free fields in our...

a Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-2535, USA b Perimeter Institute for Theoretical Physics, Waterloo, ON N2L 2Y5, Canada c Department of Physics and School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287-1404, USA d Department of Physics and Princeton Center for Theoretical Physics, Princeton University, Prin...

Motivated by the study of big crunch singularities in asymptotically AdS4 spacetimes, we consider a marginal triple trace deformation of ABJM theory. The deformation corresponds to adding a potential which is unbounded below. In a ’t Hooft large N limit, the beta function for the triple trace deformation vanishes, which is consistent with the near-boundary behavior of the bulk fields. At the ne...