120,156 research outputs found
A note on spacelike and timelike compactness
When studying the causal propagation of a field in a globally hyperbolic
spacetime M, one often wants to express the physical intuition that it has
compact support in spacelike directions, or that its support is a spacelike
compact set. We compare a number of logically distinct formulations of this
idea, and of the complementary idea of timelike compactness, and we clarify
their interrelations. E.g., a closed subset A of M has a compact intersection
with all Cauchy surfaces if and only if A is contained in J(K) for some compact
set K. (However, it does not suffice to consider only those Cauchy surfaces
that partake in a given foliation of M.) Similarly, a closed subset A of M is
contained in a region between two Cauchy surfaces if and only if the
intersection of A with J(K) is compact for all compact K. We also treat future
and past compact sets in a similar way
Effects of flavor conserving CP violating phases in SUSY models
I summarize our recent works on the effects of flavor conserving CP violating
phases in SUSY models on and phenomenology.Comment: Contributed alk at the 3rd International Conference on B Physics and
CP Violation (BCONF99), Taipei, Taiwan, 3-7 Dec 1999 (4 pages
The topology and geometry of contact structures in dimension three
The goal of this article is to survey recent developments in the theory of
contact structures in dimension three.Comment: 13 pages. To appear in the ICM 2006 proceeding
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