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Unified limiting form of graviton radiation at extreme energies
Marcello Ciafaloni, Dimitri Colferai, Francesco Coradeschi +1
We derive the limiting form of graviton radiation in gravitational scattering at transplanckian energies () and small deflection angles. We show that --- owing to the gra…
Time of flight of ultra-relativistic particles in a realistic Universe: a viable tool for fundamental physics?
G. Fanizza, M. Gasperini, G. Marozzi +1
Including the metric fluctuations of a realistic cosmological geometry we reconsider an earlier suggestion that measuring the relative time-of-flight of ultra-relativistic particle…
A microscopic description of absorption in high-energy string-brane collisions
Giuseppe D'Appollonio, Paolo Di Vecchia, Rodolfo Russo +1
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…
A new approach to the propagation of light-like signals in perturbed cosmological backgrounds
G. Fanizza, M. Gasperini, G. Marozzi +1
We present a new method to compute the deflection of light rays in a perturbed FLRW geometry. We exploit the properties of the Geodesic Light Cone (GLC) gauge where null rays propa…
Emerging Hawking-like Radiation from Gravitational Bremsstrahlung Beyond the Planck Scale
Marcello Ciafaloni, Dimitri Colferai, Gabriele Veneziano
We argue that, as a consequence of the graviton's spin-2, its bremsstrahlung in trans-planckian-energy () gravitational scattering at small deflection angle can be nicely…
Regge behavior saves String Theory from causality violations
Giuseppe D'Appollonio, Paolo Di Vecchia, Rodolfo Russo +1
Higher-derivative corrections to the Einstein-Hilbert action are present in bosonic string theory leading to the potential causality violations recently pointed out by Camanho et a…