project title: Structure of the Universe vacuum
project leader: Larisa Laperashvili, Holger Nielsen
access given (in days): 14
access used (in days): 12
local host: Grigory Volovik
home institution: The Niels Bohr Institute, Blegdamsvej 17, 2100 Copenhagen
country of institution: Denmark
starting date (yyyy-mm-dd): 2006-06-12
Experience with condensed matter systems suggests that as distinct from the fermionic fields, the gauge fields are not fundamental. This implies the new ultraviolet cut-off which is well above the Planck energy scale, so that the merging of the running couplings constants of the weak, strong, and electromagnetic fields does not require the unification of these gauge fields at high energy. The same idea came from the particle physics side and was suggested by professors Holger Nielsen and Larisa Laperashvili. Another common features of the condensed matter and particle physics approaches is the possibility of coexistence of different quantum vacuum, like different superfluid phase of 3He, which in the particle physics approach is called the Multiple Point Principle and has been developed by the Nielsen group. The goal of the project is the study of the properties of the quantum vacuum of the Universe in connection to two cut-off scales, and to coexistence of different vacua.
Using the new preonic model of composite quarks and leptons in which preons are dyons confined by hypermagnetic strings, a simple explanation has been obtained by prof. Laperashvili of why quarks and leptons of three generations of Standard Model of strong and electroweak interactions have so different masses. The hierarchy of the Standard Model masses is connected to the string construction of the preonic bound states. In her work, Laperashvili used the results obtained by F.R. Klinkhamer and G.E. Volovik in JETP Lett. 81 (2005) 551, who extended the condensed matter approach to study the Standard Model without unification.