0 40 80 06 v 1 1 A ug 2 00 4 Why Two Sexes ?

ar X iv : h ep - t h / 01 08 06 7 v 1 1 0 A ug 2 00 1 Why 3 + 1 metric rather than 4 + 0 or 2 + 2 ?

Why does the physical 4-dimensional space have a 3 + 1 signature rather than a 4 + 0 or a 2 + 2 for its metric? We give a simple explanation based largely on a group-theoretic argument a la Wigner. Applied to flat spaces of higher dimensions the same approach indicates that metrics with more than one time dimension are physically unacceptable because the corresponding irreducible unitary repres...

ar X iv : h ep - e x / 00 08 06 5 v 1 2 6 A ug 2 00 0 Search for Large Extra Dimensions in Dielectron and Diphoton Production

ar X iv : m at h - ph / 0 40 80 37 v 1 2 4 A ug 2 00 4 Integrable nonholonomic geodesic flows on compact Lie groups ∗

This paper is a review of recent results on integrable nonholonomic geodesic flows of left–invariant metrics and leftand right–invariant constraint distributions on compact Lie groups.

/ 06 08 33 0 v 1 30 A ug 2 00 6 Phenomenology of Left - Right Twin Higgs Model

ar X iv : m at h - ph / 0 40 80 51 v 1 2 6 A ug 2 00 4 Chern - Simons Integral as a Surface Term ∗

Under certain circumstances the Chern-Simons 3-form is exact (or is a sum of exact forms). Its volume integral can be written as a surface term, in a " holographic " representation.