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Search: WFRF:(D'Appollonio Giuseppe)

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1.
  • D'Appollonio, Giuseppe, et al. (author)
  • A microscopic description of absorption in high-energy string-brane collisions
  • 2016
  • In: Journal of High Energy Physics (JHEP). - : Springer. - 1126-6708 .- 1029-8479. ; :3
  • Journal article (peer-reviewed)abstract
    • We study the collision of a highly energetic light closed string off a stack of Dp-branes at (sub)string-scale impact parameters and in a regime justifying a perturbative treatment. Unlike at larger impact parameters - where elastic scattering and/or tidal excitations dominate - here absorption of the closed string by the brane system, with the associated excitation of open strings living on it, becomes important. As a first step, we study this phenomenon at the disk level, in which the energetic closed string turns into a single heavy open string at rest whose particularly simple properties are described.
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2.
  • D'Appollonio, Giuseppe, et al. (author)
  • Microscopic unitary description of tidal excitations in high-energy string-brane collisions
  • 2013
  • In: Journal of High Energy Physics (JHEP). - 1126-6708 .- 1029-8479. ; :11, s. 126-
  • Journal article (peer-reviewed)abstract
    • The eikonal operator was originally introduced to describe the effect A tidal excitations on higher-genus elastic string amplitudes at high energy. In this paper we provide a precise interpretation for this operator through the explicit tree-level calculation of generic inelastic transitions between closed strings as they scatter off a stack of parallel Dp-branes. We perform this analysis both in the light-cone gauge, using the Green-Schwarz vertex, and in the covariant formalism, using the Reggeon vertex operator. We also present a detailed discussion of the high-energy behaviour of the covariant string amplitudes, showing how to take into account the energy factors that enhance the contribution of the longitudinally polarized massive states in a simple way.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Di Vecchia, Paolo (2)
Russo, Rodolfo (2)
D'Appollonio, Giusep ... (2)
Veneziano, Gabriele (2)
University
Royal Institute of Technology (2)
Stockholm University (2)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)

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