Orientifolds: The Unique Personality Of Each Spacetime Dimension
Abstract
I review some recent developments in our understanding of the dynamics of Z_2 orientifolds of type IIA and IIB strings and Mtheory. Interesting physical phenomena that occur in each spacetime dimension from 10 to 1 are summarized, along with some relationships to nonperturbative effects and to M and Ftheory. The conceptual aspects that are highlighted are: (i) orientifolds of Mtheory, (ii) exceptional gauge symmetry from open strings, (iii) certain similarities between branes and orientifold planes. Some comments are also made on disconnected components of orientifold moduli space.
 Publication:

arXiv eprints
 Pub Date:
 October 1997
 DOI:
 10.48550/arXiv.hepth/9710004
 arXiv:
 arXiv:hepth/9710004
 Bibcode:
 1997hep.th...10004M
 Keywords:

 High Energy Physics  Theory
 EPrint:
 harvmac, 15 pages (b), one eps figure