Organizer: | Jean-Sebastien Gagnon |
---|---|

Date: | Mondays, 13:00 |

Room: | S2|11 207 |

This informal gathering is organized by students for students (with the help of postdocs and professors). The goal of each gathering is to discuss physics topics of interest to the attendees, ranging from classic or recent papers to their own research projects. The planned format of each meeting is that a designated person prepares a 15-25 minutes blackboard talk in order to spark off some discussions (which should hopefully last until our alloted one hour time slot is spent).

14. 08. 2014 at 16:00S2 11/10 | ## Theorie-PalaverDominik Smith (TU Darmstadt) The goal of the seminar is to present the motivation for lattice field theorists and high-energy physicists to study graphene, then present a step-by-step derivation of the theoretical basis of Hybrid-Monte-Carlo simulations of graphene and then give an overview over results obtained. |

24. 10. 2011 at 13:00S2 11/207 | ## Theorie-PalaverHans-Peter Pavel (TU Darmstadt and JINR Dubna) As an illustrative example the simplest case of a spin-0 glueball spectrum of SU(2) Yang-Mills quantum mechanics is calculated with high precision, using the analytical solutions of the corresponding 3-dim harmonic oscillator Schroedinger equation (a Calegero-type model) as appropriate basis states. |

17. 10. 2011 at 13:00S2 11/207 | ## Theorie-PalaverHans-Peter Pavel (TU Darmstadt and JINR Dubna) An introduction to the Hamiltonian formulation of gauge theories |

06. 07. 2011 at 13:00S2 11/207 | ## Theorie-PalaverDr Jean-Sebastien Gagnon (TU Darmstadt) In this Palaver I present a brief (non exhaustive) review of the dark energy problem. Starting from observational evidences for an accelerated universal expansion, I go on with the simplest solution to this problem (i.e. adding a cosmological constant to Einstein's equations) and show its ``unnaturalness''. If time permits, I will present some other ideas/models that have been proposed to explain this phenomenon (e.g. quintessence, braneworlds, voids). |

20. 06. 2011 at 13:00S2 11/207 | ## Theorie-PalaverDaniel Nowakowski (TU Darmstadt) In this talk I give a short introduction about the model of complex action by M. Ninomiya and H.B. Nielsen. Especially I focus on possible effects on the running of the Large Hadron Collider. Also an experiment, which would allow to test the fate of LHC with a card game, will be presented. Possible effects of the complex action model would be, that the Higgs suppresses its production by backward causation, e.g. in collider experiments. Therefore the appearance of many Higgs-particles in certain experiments would possess strong influence of the correctness of this theory. It is argued, that the accident of the LHC shortly after start was such a signal of suppression and that the cancelation of the Superconducting Super-Collider (SSC) was due to backward causation. In my palaver I will review critically the statements of Nielsen et al. for this model, point out further implications of complex actions and try to estimate, which future collider experiment is "allowed by the Higgs", if the model is true. If there is some time left, I wish to point out how the complex action model is related to EPS-Bell's Theorem problem. |

23. 05. 2011 at 13:00S2 14/401 | ## Theorie-Palaver (TU Darmstadt) In my talk, I will present some general ideas linking quantum and classical correlation. I will briefly talk about quantum entanglement and what seperates local theories as a class from QM. Also, i wish to point out experimental problems with detection efficiency and i will present a very easy model that abuses non-perfect detectors to reproduce quantum mechanical expectation values exactly while beeing local with the help of hidden variables. |

09. 05. 2011 at 13:00S2 11/207 | ## Theorie-PalaverNico Formanek (TU Darmstadt) I will talk about the basic concepts in quantum logic (e.g. some lattice theory) and how they relate to the algebraic concept of Hilbert spaces which are normally taught in physics. From a more philosophical point of view I hope to shed some light on how quantum logic might or might not illuminate some problems (hidden variables and the likes) which "haunt" the interpretations of quantum mechanics. |

28. 03. 2011 at 13:00S2 11/207 | ## Theorie-PalaverSam Edwards (TU Darmstadt) A few years ago, Freeman Dyson asked the question if it is possible to detect a single graviton in a realistic experimental setting. The answer to this question is linked to the relevance of quantizing gravity. In this Palaver, I will present a paper (arXiv: gr-qc/0601043) that discusses the possibility of detecting a single graviton. I intend to present the salient points of the paper, but leave plenty of room for (fiery) discussions. Please read the paper and be prepared! |

14. 03. 2011 at 13:00S2 14/401 | ## Theorie-PalaverDavid Mesterhazy (TU Darmstadt) I will be discussing some aspects related to gravity in three dimensions. We will see why it is an interesting model to look at and on the way, a few surprises will appear. |

21. 02. 2011 at 13:00S2 14/401 | ## Theorie-Palaver (TU Darmstadt) The non-equlibrium dynamics of quantum fields is relevant for a variety of physical problems. In general this requires non-perturbative techniques as to secular divergences arising in a perturbative treatment. |

07. 02. 2011 at 13:00S2 14/401 | ## Theorie-PalaverPiotr Piasecki (TU Darmstadt) Today I will give a short introduction to the functional Renormalization Group. I will explain its basic concepts and will derive the famous Wetterich Equation. After that this Equation will be applied to a simple example. |

24. 01. 2011 at 13:00S2 14/401 | ## Theorie-PalaverDr Jean-Sebastien Gagnon (TU Darmstadt) In this Palaver I will present some fundamental concepts of baryogenesis. Starting with a brief review of observational evidences for an asymmetric universe, I will go through the necessary conditions a model must have in order to produce a baryon asymmetry (Sakharov conditions) and show if the Standard Model has "what it takes"' to explain it. |

13. 12. 2010 at 13:00S2 14/401 | ## Theorie-Palaver (TU Darmstadt) I will start with the Higgs mechanism and the Higgs boson in the electroweak sector of the standard model. There the (rather aesthetic) fine-tuning problem occurs, which has become a reason for theorists to consider theories beyond the current standard model. I will therefore try to sketch the ideas concerning the Higgs boson in technicolour and supersymmetry. |

29. 11. 2010 at 13:00S2 14/401 | ## Theorie-PalaverHannes Basler (TU Darmstadt) Starting with a sketch of the Proof of Existence of Color Superconductivity, I will discuss the most symmetric pairing pattern in three-flavor quark matter, the color-flavor locked (CFL) phase, also showing how stress on CFL pairs leads to less symmetric pairing patterns. After these general consideration I will give an short overview of the different approaches to describe color superconductivity, for some reason focusing on the NJL model. |

01. 11. 2010 at 13:00S2 14/401 | ## Theorie-Palaver (TU Darmstadt) After having introduced the 2PI effective action in the first part of this introduction, I will explain why it is so well suited for nonequilibrium QFT. Special emphasis will be placed on the implementation of the statistical aspects of nonequilibrium physics and the differences to vacuum and thermal QFT. The aim is then to derive the evolution equations of certain propagators which contain important information about the nonequilibrium evolution of a given system. |

18. 10. 2010 at 13:00S2 14/401 | ## Theorie-Palaver (TU Darmstadt) The topic will be centered around the following key words: Geometrical quantization, quantization of the Riemann sphere as an example, spinor geometry, Hopf fibration and monopole harmonics. |

04. 10. 2010 at 13:00S2 14/401 | ## Theorie-Palaver (TU Darmstadt) I will give a brief introduction to phenomenological aspects of Dyson-Schwinger Equations and will concentrate on the application of that approach to hadronic contributions to the g-2 of the muon. |

20. 09. 2010 at 13:00S2 14/401 | ## Theorie-PalaverNils Strodthoff (TU Darmstadt) I will give a brief introduction to anomalies in quantum field theory. As an example I will consider the chiral anomaly. I want to show that anomalies are not just a theoretical peculiarity but on the one hand have direct experimental consequences and on the other hand impose strong constraints on gauge theories via the requirement of anomaly cancellation. |

13. 09. 2010 at 13:00S2 14/401 | ## Theorie-PalaverStefano Carignano (TU Darmstadt) Why are heavy quark observables so interesting in the heavy ion business? How can we extract some information on the properties of the Quark-Gluon plasma from them? What have we discovered so far? This, and much more, after a short commercial break. |

Technische Universität Darmstadt

Institut für Kernphysik

Theoriezentrum

S2|11

Schlossgartenstraße 2

64289 Darmstadt