"In the case of parallel multi D-branes there can be open strings with one end on one brane and the other end on another brane. Classically, such a string has a minimum energy proportional to the distance between the branes. Supersymmetry ensures that this remains true quantum-mechanically, so additional massless states can appear only when two or more D-branes coincide."
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Fellows of the Royal SocietyPhysicists from the United KingdomUniversity of Cambridge facultyAcademics from the United Kingdom
Original Language: English
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(quote from pages 12–13)
https://en.wikiquote.org/wiki/Paul_Townsend
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Paul Townsend
Paul Kingsley Townsend (born 3 March 1951) is a British theoretical physicist, specializing in general relativity, supersymmetry, string/M-theory, solitons, and cosmology. He was elected a Fellow of the Royal Society in 2000.
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