Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Firrotta, Maurizio"'
We study tree-level scattering processes of arbitrary string states using the DDF formalism and suitable coherent vertex operators. We obtain new exact compact formulae for heavy-heavy-light-light scattering amplitudes in open or closed bosonic strin
Externí odkaz:
http://arxiv.org/abs/2407.16476
We propose a novel indicator for chaotic quantum scattering processes, the scattering form factor (ScFF). It is based on mapping the locations of peaks in the scattering amplitude to random matrix eigenvalues, and computing the analog of the spectral
Externí odkaz:
http://arxiv.org/abs/2403.00713
Autor:
Firrotta, Maurizio
We extend the Veneziano and Shapiro-Virasoro amplitudes to four arbitrarily excited states in bosonic string theory. We use the formalism of coherent string states based on the Di Vecchia-Del Giudice-Fubini construction. Within the same formalism, we
Externí odkaz:
http://arxiv.org/abs/2402.16183
We analyze the amplitudes of one highly excited string (HES) state with two or three tachyons in open bosonic string theory. We argue that these processes are chaotic by showing that the spacing ratios of successive peaks in the angular dependence of
Externí odkaz:
http://arxiv.org/abs/2303.17233
Autor:
Firrotta, Maurizio
We analyse the most general process of a generic highly excited string that decays into a less excited, yet generic, highly excited string emitting a tachyon. We provide a simple and compact analytic description of the decay process which discriminat
Externí odkaz:
http://arxiv.org/abs/2301.04069
Publikováno v:
Phys. Rev. Lett. 129 (2022), 261601
We propose a novel measure of chaotic scattering amplitudes. It takes the form of a log-normal distribution function for the ratios $r_n={\delta_n}/{\delta_{n+1}}$ of (consecutive) spacings $\delta_n$ between two (consecutive) peaks of the scattering
Externí odkaz:
http://arxiv.org/abs/2207.13112
We compute the amplitude for an excited string in any precisely specified state to decay into another excited string in any precisely specified state, via emission of a tachyon or photon. For generic and highly excited string states, the amplitude is
Externí odkaz:
http://arxiv.org/abs/2207.01641
Publikováno v:
JHEP 05 (2022) 058
We study the emergence of partonic behavior in scattering processes at large Mandelstam's variable $s$ from string amplitudes in holographic backgrounds. We generalize the approach of Polchinski and Strassler (2001) in two ways. (i) We analyze severa
Externí odkaz:
http://arxiv.org/abs/2111.12106
We extend and generalise the string corrections to the EM memory to the Type I superstring including spin effects. Very much as in the simpler bosonic string context, the relevant corrections are non-perturbative in $\alpha'$, slowly decaying (as $1/
Externí odkaz:
http://arxiv.org/abs/2101.07054
We identify string corrections to the EM memory effect. Though largely negligible in the low-energy limit, the effect become relevant in high-energy collisions and in extreme events. We illustrate our findings in a simple unoriented bosonic string mo
Externí odkaz:
http://arxiv.org/abs/2010.04082