Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-12-13
JHEP0605:060,2006
Physics
High Energy Physics
High Energy Physics - Theory
32 pages, Latex
Scientific paper
10.1088/1126-6708/2006/05/060
Finite N effects on the time evolution of fuzzy 2-spheres moving in flat spacetime are studied using the non-Abelian DBI action for N D0-branes. Constancy of the speed of light leads to a definition of the physical radius in terms of symmetrised traces of large powers of Lie algebra generators. These traces, which determine the dynamics at finite N, have a surprisingly simple form. The energy function is given by a quotient of a free multi-particle system, where the dynamics of the individual particles are related by a simple scaling of space and time. We show that exotic bounces of the kind seen in the 1/N expansion do not exist at finite N. The dependence of the time of collapse on N is not monotonic. The time-dependent brane acts as a source for gravity which, in a region of parameter space, violates the dominant energy condition. We find regimes, involving both slowly collapsing and rapidly collapsing branes, where higher derivative corrections to the DBI action can be neglected. We propose some generalised symmetrised trace formulae for higher dimensional fuzzy spheres and observe an application to D-brane charge calculations.
McNamara Sara
Papageorgakis Constantinos
Ramgoolam Sanjaye
Spence Bill
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