project title: Simulation of Lorentz violation in quantum liquids
project leader: Giovanni Amelino-Camelia
access given (in days): 14
access used (in days): 4
local host: Grigopry Volovik
home institution: Dipartimento di Fisica, Universita di Roma
country of institution: Italy
starting date (yyyy-mm-dd): 2006-03-26
The condensed-matter approach to quantum gravity naturally leads to scenarios in which space-time itself is only an emergent entity. Condensed-matter theorists are used to describe some of the degrees of freedom that are measured in the laboratory as collective excitations within a theoretical framework whose primary description is given in terms of much different, and often practically unaccessible, fundamental degrees of freedom. These collective degrees of freedom are relevant for the description of certain physical systems only at (or near) a fixed point. The most prominent example is provided by superfluid 3He-A where the Lorentz special-relativistic invariance emerges (together with gravity) only in the low energy corner near the Fermi point. The goal of the project is to explore the condensed matter experience to develop quantum gravity in which the familiar classical continuous Lorentz symmetry is treated only as an approximate (emergent) symmetry, which is violated at a more fundamental trans-Planckian level.
Giovanni Amelino–Camelia and Grigory Volovik organized and chaired of two sessions at the large international conference "Eleventh Marcel Grossmann Meeting on General Relativity", held at the Freie Universität Berlin in July 23 - 29, 2006 ( During the ULTI-visit of Amelino–Camelia the program of the two sessions (Quantum Gravity Phenomenology, Amelino–Camelia, and Analog Models of and for General Relativity, Volovik) were elaborated and the proper speakers selected. Both sessions were devoted to the connection between condensed matter physics and quantum gravity: the rapidly developing phenomenology of quantum gravity is now essentially based on the condensed-matter approach, which allows us to construct the working models for quantum gravity and in particular discuss the possible origin of the violation of the Lorentz symmetry at the trans-Planckian energy scale and its consequence for cosmology.