Najbliższe Krakowskie Konwersatorium Fizyczne odbędzie się 28 października 2021 r. o godz. 16:15 zdalnie za pośrednictwem MS Teams.

Prof. Steven Bass (Kitzbühel Centre for Physics, Austria) wygłosi wykład pt. „Emergent gauge symmetries – making symmetry as well as breaking it”.

Abstract:
Local gauge symmetries determine the interactions of elementary particles with exchange of gauge bosons between fermions. For example, the photon in Quantum Electrodynamics, gluon exchange between quarks in Quantum Chromodynamics and W and Z bosons in weak interactions. Gravitation can also be regarded as a gauge theory associated with co-ordinate transformations. Where do these symmetries come from? Do they unify at very-high energies, or might they be emergent, “dissolvi  ng” in the extreme ultraviolet? Emergent gauge symmetries are seen in quantum many-body systems associated with quantum phase transitions, e.g., in high temperature superconductors, spin-liquids, string-net condensation and the A-phase of low temperature Helium-3. Might the gauge symmetries of particle physics also be emergent? If yes, what is the universality class and critical dimension of the quantum phase transition?
In this Colloquium we discuss the scenario of an emergent particle physics Standard Model. We argue that the cosmological constant scale, 0.002 eV, comes out suppressed by factor of the large scale of emergence and is of the same order as the size of light Majorana neutrino masses, which are expected from thinking about neutrino oscillations data to be in region typically about 0.005 eV.

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Link do spotkania.