Probably the best way to introduce them is to quote from the second introduction (the one addressed to people who know what a topological space is): The goal of these notes is to develop the basic ...

This paper deals with some aspects of two-time physics (i.e., 2T + 3S five-dimensional space) for a Minkowski-like space with distinct speeds of causality for the time dimensions. Detailed ...

The vacuum Einstein equations in (4+m+n) dimensions are displayed for a class of metrics obtained by the Kaluza-Klein geometrisation of the (4+m)-dimensional Einstein-Maxwell equations. Consistency ...

This article is a review and promotion of the study of solutions of differential equations in the “neighborhood of infinity” via a non traditional compactification. We define and compute critical ...

Abstract: A key challenge in the study of geometric objects is understanding their degenerations, particularly when these objects approach limits or boundary cases. In the context of moduli spaces, ...

In toroidal compactification of open-string theories, the background fields of the “parent” closed string (metric and antisymmetric tensor, with suitable restrictions) are accompanied by open-string ...