On the Exotic Phases of M-theory

Abstract

We study aspects of the new phases of M-theory recently conjectured using generalised dualities such as timelike T-duality. Our focus is on brane solutions. We derive the intersection rules in a general framework and then specialise to the new phases of M-theory. We discuss under which conditions a configuration with several branes leads to a regular extremal black hole under compactification. We point out that the entropy seems not to be constant when the radius of the physical timelike direction is varied. This could be interpreted as a non-conservation of the entropy (and the mass) under at least some of the new dualities.

13 pages, LaTeX file, no figures

References in corpus (7)

• Timelike T-Duality, de Sitter Space, Large $N$ Gauge Theories and Topological Field Theory
• Duality and the Signature of Space-Time
• Intersection Rules for p-Branes
• Duality and Moduli Spaces for Time-Like Reductions
• Euclidean-signature Supergravities, Dualities and Instantons
• Sigma-model for Generalized Composite p-branes
• Intersections involving waves and monopoles in eleven dimensions

Cited by in corpus (3)

• G+++ Invariant Formulation of Gravity and M-Theories: Exact Intersecting Brane Solutions
• An E9 multiplet of BPS states
• Intersection rules, dynamics and symmetries