Can free strings propagate across plane wave singularities?

Details Can free strings propagate across plane wave singularities? Can free strings propagate across plane wave singularities?

2008-12-15

arxiv.org/abs/0812.2900v2

JHEP 0903:105,2009

Physics

High Energy Physics

High Energy Physics - Theory

24 pages; v.2: published version, minor clarifications added

Scientific paper

10.1088/1126-6708/2009/03/105

We study free string propagation in families of plane wave geometries developing strong scale-invariant singularities in certain limits. We relate the singular limit of the evolution for all excited string modes to that of the center-of-mass motion (the latter existing for discrete values of the overall plane wave profile normalization). Requiring that the entire excitation energy of the string should be finite turns out to be quite restrictive and essentially excludes consistent propagation across the singularity, unless dimensionful scales are introduced at the singular locus (in an otherwise scale-invariant space-time).

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