Announcements

• Bethe-Colloquium by Dieter Zeppenfeld (Karlsruher Institut für Technologie - KIT, TP), November 21st, 2019
• Bethe-Colloquium by Uwe-Jens Wiese (University of Bern), December 5th, 2019
• Bethe-Colloquium by Herbert Spohn (TUM), January 9th, 2020
• Bethe-Colloquium by Astrid Eichhorn (SDU, Odense / Heidelberg), January 23rd, 2020
• Lecture Series on the "Cosmic Microwave Background" by Raphael Flauger (UC San Diego), February 10 - 14, 2020
• Bethe Forum "Inflation", March 23 - 27, 2020
  Organizers: M. Peloso (Padua), M. Drees (Bonn), H. P. Nilles (Bonn) and Ivonne Zavala (Swansea)
• Bethe Forum "Modular Flavor Symmetries", May 4-8, 2020
  Organizers: M. Ratz (Irvine), F. Feruglio (Padua), T. Kobayashi (Sapporo) and H. P. Nilles (Bonn).

Further information will be given as soon as it is available.

This month's Bethe Colloquium will take place on Thursday, November 21st, 2019, at 4:15 pm in Hörsaal I.

• Dieter Zeppenfeld (Karlsruher Institut für Technologie - KIT, TP)
• Diboson production at the LHC
• Hörsaal I, Physikalisches Institut

Abstract: Diboson production processes provide a rich testing ground for SM predictions at the LHC. The talk will discuss recent progress in vector boson pair production from quark-antiquark annihilation as well as vector boson scattering processes. Both put stringent constraints on extensions of the SM as parameterized by effective field theories.

December's Bethe Colloquium will take place on Thursday, December 5th, 2019, at 5:15 pm in Hörsaal I.
Please take note of the unusual time!

• Uwe-Jens Wiese (University of Bern)
• Quantum Simulation of Abelian and non-Abelian Gauge Theories
• Hörsaal I, Physikalisches Institut

Abstract: Strongly coupled gauge theories play an important role in different areas of physics. Quantum Chromodynamics is the non-Abelian SU(2) gauge theory that describes the strong interactions between quarks and gluons in particle physics. Some strongly correlated electron systems in condensed matter physics are described by Abelian U(1) gauge theories, and the toric code, a quantum information storage device, is an Abelian Z(2) gauge theory. Many non-trivial aspects of gauge theories are accessible to accurate numerical simulations on classical computers. However, at high fermion density or in out-of-equilibrium situations such simulations suffer from notorious sign problems that prevent the importance sampling underlying Monte Carlo calculations. Quantum simulators are accurately controllable quantum devices that mimic other quantum systems. They do not suffer from sign problems, because their hardware is intrinsically quantum mechanical. For example, trapped ions that follow a laser-driven stroboscopic discrete time evolution through a sequence of quantum gate operations, have been used as a digital quantum simulator for particle-anti-particle pair creation. Analog quantum simulators, on the other hand, follow the continuous time-evolution of a tunable model Hamiltonian. Using ultra-cold atoms in optical lattices, analog quantum simulators have been designed for Abelian and non-Abelian gauge theories. Their experimental realization is a challenge for the foreseeable future, which holds the promise to access the real-time dynamics of string breaking, the out-of-equilibrium decay of a false vacuum, or the evolution af a chiral condensate after a quench, from first principles. Quantum link models which realize gauge theories including QCD, not with classical fields but with discrete quantum degrees of freedom, are ideally suited for implementation in ultracold quantum matter. For example, the nuclear spin of alkaline-earth atoms can be used to embody the SU(3) color degrees of freedom of quarks and gluons. SU(3) quantum spin ladders are closely related condensed matter systems which can be quantum simulated in a similar manner.

The Bethe Center for Theoretical Physics in Bonn will host a Bethe Forum on "Inflation" from March 23rd to 27thth to 19th. The organizers are Marco Peloso (Padua), Manuel Drees (Bonn, Hans Peter Nilles (Bonn) and Ivonne Zavala (Swansea).

More information and the registration form can be found on the event webpage.