Handbook on string decay

Details Handbook on string decay Handbook on string decay

2006-01-11

arxiv.org/abs/hep-th/0601072v3

JHEP0602:041,2006

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, 9 figures. Final version appeared in JHEP

Scientific paper

10.1088/1126-6708/2006/02/041

We explain simple semi-classical rules to estimate the lifetime of any given highly-excited quantum state of the string spectrum in flat spacetime. We discuss both the decays by splitting into two massive states and by massless emission. As an application, we study a solution describing a rotating and pulsating ellipse which becomes folded at an instant of time -- the ``squashing ellipse''. This string interpolates between the folded string with maximum angular momentum and the pulsating circular string. We explicitly compute the quantum decay rate for the corresponding quantum state, and verify the basic rules that we propose. Finally, we give a more general (4-parameter) family of closed string solutions representing rotating and pulsating elliptical strings.

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