Announcements
Upcoming events
 BetheColloquium by Corinna Kollath (Bonn), June 6th, 2019
 BetheColloquium by Yuval Grossman (Cornell University, LEPP), July 4th, 2019

Bethe Forum "Number Theoretic Methods in Quantum Physics", July 15th  19th, 2019
Organizers: H. Jockers (PI Bonn, bctp), A. Klemm (PI Bonn, bctp), H. Monien (PI Bonn, bctp), G. Oberdieck (HIM Bonn) and D. Zagier (MPIfM, Bonn) 
Bethe Forum "Multihadron Dynamics in a Box", Sept. 9th  13th, 2019
Organizers: M. Mai (Washington, DC), U.G. Meißner (Bonn / Jülich), A. Rusetsky and C. Urbach (both Bonn)  Lecture Series "Machine Learning and its Applications" by Fabian Ruehle (CERN), Oct. 7th  10th, 2019
Further information will be given as soon as it is available.
Bethe Colloquium by Corinna Kollath
The next Bethe Colloquium will take place on Thursday, June 6th, 2019, at 4:15 pm in Hörsaal I.
 Corinna Kollath (HISKP, Bonn)
 Unconventional dynamics of ultracool bosons in optical lattices
 Hörsaal I, Physikalisches Institut
Abstract: Atomic gases cooled to Nanokelvin temperatures are a new exciting tool to study a broad range of quantum phenomena. In particular, an outstanding degree of control over the fundamental parameters, such as interaction strength, spin composition, or dimensionality has been achieved. This has facilitated access to strongly correlated quantum many body physics in exceptionally clean samples. For example, artificial periodic structures for the atomic gas can be created using laser light to mimic condensed matter systems. Further, the outstanding tunability of cold gases allows to rapidly change the system parameters or to induce a coupling to an environment and to observe the subsequent quantum evolution. This ability poses new challenges for the understanding of quantum dynamics in correlated manybody systems. I will report on recent progress on investigating bosonic gases in optical lattices coupled to dissipative light fields described by Markovian Master equations. In particular, we point out different dynamical regimes: The first one is an algebraic decay of correlations which is followed by a stretched exponential decay. We analyze the origin of this unconventional dynamics. The algebraic behavior is related to the continuum spectrum of the bosonic gas and we develop a classical diffusion equation description for the dynamics. In contrast, the stretched exponential dynamics can be traced back to the existence of rare states with increasingly long time scales.
Book on Nuclear Lattice EFT published
Bethe Forum "Number Theoretic Methods in Quantum Physics"
For more information as well as the registration form please see the event webpage.
Bethe Forum "Multihadron Dynamics in a box"
For more information as well as the registration form please see the event webpage.
Recent years have witnessed a growing interest in the study of threeparticle systems in lattice QCD. Substantial progress has been achieved both in the development of the methods
that enable one to extract infinitevolume observables from lattice data produced on finitesize lattices, as well as in MonteCarlo calculations of the threeparticle systems, but
important recent developments in the twoparticle sector will also be addressed, since these questions are inherently related to each other.
In particular, it is planned to discuss the following questions:
 What is the best strategy in the analysis of data in the threeparticle sector?

 What are the quantities to extract form the finitevolume sector?

 How the further progress in the field looks like after the derivation of the quantization condition (analysis of the data on the Roper resonance, threeparticle decay matrix elements, etc.)?

 What are the present status and immediate perspectives of lattice simulations in the threeparticle sector? For example, can one expect the calculation of the excited levels in the threeparticle sector? Are the calculations in manybody (four and more) systems feasible in a forseeable future?
Lecture Series on "Machine Learning and its Applications"
Fabian Ruehle (CERN, Geneva) will give a Lecture Series on "Machine Learning and its Applications" from October 3  11, 2019, in the Bethe Center for Theoretical Physics in Bonn.
Abstract: Machine Learning techniques, in particular neural networks, have become an integral part of our lives. Due to their versatile nature, they are applied in the private and academic sector with tremendous success. In these lectures, I will first review the basic building blocks of neural networks and how they are trained. I will then discuss popular neural network architectues and how they are used in unsupervised, semisupervised and supervises machine learning. I will also intrudce other common machine learning techniques and present example applications to problems in Physics (ranging from Astrophysics and Cosmology to Particle Physics, Mathematical Physics and String Theory). In the exercises, I will use the techniques introduced in the lectures to solve simple problems in real time.
For more information please check the event webpage.
Further events will be announced as soon as possible.