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113 papers · 1 filter
Towards an S-matrix Description of Gravitational Collapse
D. Amati, M. Ciafaloni, G. Veneziano
Extending our previous results on trans-Planckian () scattering of light particles in quantum string-gravity we present a calculation of the corresponding S-matrix fr…
An invariant regarding Waring's problem for cubic polynomials
Giorgio Ottaviani
We compute the equation of the 7-secant variety to the Veronese variety (P^4,O(3)), its degree is 15. This is the last missing invariant in the Alexander-Hirschowitz classification…
Local control of entanglement in a spin chain
F. Plastina, T. J. G. Apollaro
In a ferromagnetic spin chain, the control of the local effective magnetic field allows to manipulate the static and dynamical properties of entanglement. In particular, the propag…
Out of equilibrium phase transitions in mean field Hamiltonian dynamics
Pierre-Henri Chavanis, Giovanni De Ninno, Duccio Fanelli +1
Systems with long-range interactions display a short-time relaxation towards Quasi-Stationary States (QSSs), whose lifetime increases with system size. With reference to the Hamilt…
Opinion Dynamics in an Open Community
Timoteo Carletti, Duccio Fanelli, Alessio Guarino +2
We here discuss the process of opinion formation in an open community where agents are made to interact and consequently update their beliefs. New actors (birth) are assumed to rep…
Linear water waves with vorticity: rotational features and particle paths
Mats Ehrnstrom, Gabriele Villari
Steady linear gravity waves of small amplitude travelling on a current of constant vorticity are found. For negative vorticity we show the appearance of internal waves and vortices…