Topic: 
Measuring the World  Precision Measurements of Fundamental Properties of Atoms and Nuclei 
Date: 
22.05.17 
Time: 
16:15 
Place: 
H6 
Guest: 

MaxPlanckInstitut für Kernphysik, Heidelberg 

Abstract: 
The presentation will concentrate on recent applications with exciting results of Penning traps in atomic and nuclear physics with cooled and stored exotic ions. These are highaccuracy mass measurements of shortlived radionuclides, gfactor determinations of the boundelectron in highlycharged, hydrogenlike ions and gfactor measurements of the proton and antiproton. The experiments are dedicated to nuclear, neutrino and astrophysics studies in the case of mass measurements on radionuclides, and to the determination of fundamental constants and a CPT test using gfactor measurements. 
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Topic: 
tba 
Date: 
21.04.17 
Time: 
16:15 
Place: 
V2210/216 
Guest: 
Yan Fodorov 
King's College London 

Abstract: 

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Topic: 
Asymmetric Dark Matter and Baryogenesis from Pseudoscalar Inflation 
Date: 
09.02.17 
Time: 
14:15 
Place: 
D6135 
Guest: 

Bielefeld 

Abstract: 
I will talk about how both the baryon asymmetry of the Universe and the dark matter abundance can be explained within a single framework that makes use of maximally helical hypermagnetic fields produced during pseudoscalar inflation and the chiral anomaly in the Standard Model. I will focus on a minimal asymmetric dark matter model free from anomalies and constraints. The observed baryon and the dark matter abundances are achieved for a wide range of inflationary parameters, and the dark matter mass ranges between 715 GeV. The novelty of this mechanism stems from the fact that the same source of CP violation occurring during inflation explains both baryonic and dark matter in the Universe with only two inflationary parameters, hence addressing all the initial condition problems in an economical way. 
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Topic: 
Quantum Information Processing with spin systems: from modeling to realistic implementations 
Date: 
02.02.17 
Time: 
14:15 
Place: 
D5153 
Guest: 
Alessandro Chiesa 
Università degli Studi di Parma 

Abstract: 

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Topic: 
Induced QCD 
Date: 
02.02.17 
Time: 
16:00 
Place: 
D5153 
Guest: 
Robert Lohmeyer 
University of Regensburg 

Abstract: 
We explore an alternative discretization of continuum SU(Nc) YangMills theory on a Euclidean spacetime lattice, originally introduced by Budzcies and Zirnbauer. In this discretization the selfinteractions of the gauge field are induced by a path integral over Nb auxiliary boson fields, which are coupled linearly to the gauge field. The main progress compared to earlier approaches is that Nb can be as small as Nc. In the main part of this talk we (i) extend the proof that the continuum limit of the new discretization reproduces YangMills theory in two dimensions from gauge group U(Nc) to SU(Nc), (ii) derive refined bounds on Nb for noninteger values, and (iii) perform a perturbative calculation to match the bare parameter of the induced gauge theory to the standard lattice coupling. Furthermore, we will present some numerical evidence in support of the conjecture that the induced gauge theory reproduces YangMills theory also in more than two dimensions. 
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Topic: 
Radial statistics in the twodimensional onecomponent plasma and associated phase transitions 
Date: 
25.01.17 
Time: 
14:15 
Place: 
V3201 
Guest: 
Pierpaolo Vivo 
King's College London 

Abstract: 
The twodimensional onecomponent plasma is an ubiquitous model in statistical physics. For special values of the coupling constant $\beta q^2$ (where q is the particles charge and ? the inverse temperature), the model also corresponds to the eigenvalues distribution of normal matrix models. I will discuss several features of the system  in the limit of large number N of particles for generic values of the coupling constant. I show that the statistics of a certain class of radial observables produces a rich phase diagram: their asymptotic behaviour in terms of large deviation functions is calculated explicitly, including nexttoleading terms up to order 1/N. I will discuss a splitoff phenomenon associated to atypical fluctuations of the edge density profile, and show explicitly that a failure of the fluid phase assumption of the plasma can break a genuine 1/Nexpansion of the free energy. An outlook on the problem of spatially constrained Coulomb gas systems in any dimensions and universality of the associated thirdorder phase transition will also be offered. 
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