Almost Product Manifolds as the Low Energy Geometry of Dirichlet Branes

Details Almost Product Manifolds as the Low Energy Geometry of Dirichlet Branes Almost Product Manifolds as the Low Energy Geometry of Dirichlet Branes

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005fqbh.conf..567s&link_type=abstract

FROM QUARKS TO BLACK HOLES: PROGRESS IN UNDERSTANDING THE LOGIC OF NATURE. Proceedings of the International School of Subnuclear

Physics

Nuclear Physics

Scientific paper

Any candidate theory of quantum gravity must address the breakdown of the classical smooth manifold picture of space-time at distances comparable to the Planck length. String theory, in contrast, is formulated on conventional space-time. However, we show that in the low energy limit, the dynamics of generally curved Dirichlet p-branes possess an extended local isometry group, which can be absorbed into the brane geometry as an almost product structure. The induced kinematics encode two invariant scales, namely a minimal length and a maximal speed, without breaking general covariance. Quantum gravity effects on D-branes at low energy are then seen to manifest themselves by the kinematical effects of a maximal acceleration. Experimental and theoretical implications of such new kinematics are easily derived. We comment on consequences for brane world phenomenology.

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