2004/10/31 by Diego Chialva, Roberto Iengo, Jorge G. Russo · 45 citations
Mathematics · Physics and Astronomy · #Angular momentum #Brane #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Exponential decay #Galaxies: Formation, Evolution, Phenomena #Massless particle #Mathematical physics #Mathematics #Momentum (technical analysis) #Physics #Quantum electrodynamics #Quantum mechanics #Ring (chemistry) #State (computer science) #String (physics) #Superstring theory #Supersymmetry #hep-ph #hep-th
paper · pdf · doi:10.1088/1126-6708/2005/01/001
published in Journal of High Energy Physics 2005(01), 001 (Springer Nature) · 24 pages, 1 figure. Correction on lifetime of average state
arxiv created 2004/11/11 · openalex publication_date 2005/01/05 · arxiv updated 2009/12/01 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/05
In ten dimensional type II superstring, all perturbative massive states are unstable, typically with a short lifetime compared to the string scale. We find that the lifetime of the average string state of mass M has the asymptotic form T < const.1/(g2 M). The most stable string state seems to be a certain state with high angular momentum which can be classically viewed as a circular string rotating in several planes ("the rotating ring"), predominantly decaying by radiating soft massless NS-NS particles, with a lifetime T = c0 M5/g2. Remarkably, the dominant channel is the decay into a similar rotating ring state of smaller mass. The total lifetime to shrink to zero size is ~ M7. In the presence of D branes, decay channels involving open strings in the final state are exponentially suppressed, so the lifetime is still proportional to M5, except for a D brane at a special angle or flux. For large mass, the spectrum for massless emission exhibits qualitative features typical of a thermal spectrum, such as a maximum and an exponential tail. We also discuss the decay properties of rotating rings in the case of compact dimensions.