Graduate Seminar, 18th December

Speaker: Albin Nilsson

Title: The Standard Model Extension, Gravitational tests and Cosmology

Abstract: Combining the standard model and general relativity into quantum gravity is a task which has occupied physicists for over 50 years. These two theories are expected to merge at the Planck scale (E_p \approx 10^{19} GeV). However, experiments at this energy are beyond the reach of humanity at present. As such, we need a way to study the Planck scale effects that trickle down to accessible energies, thereby learning about the true dynamics of quantum gravity. This can be done using effective field theory, and since many theories of quantum gravity predict Lorentz and/or CPT violation, searching for signals of this is a good place to start. The Standard Model Extension (SME) is an effective field theory containing the standard model of particle physics, general relativity, as well as all possible operators which break Lorentz symmetry. Since CPT violation implies Lorentz violation, the SME also includes operators which both break and preserve CPT symmetry. In this talk, I will describe the structure of the SME, focusing on the gravitational sector. I will review some of the gravitational tests performed and discuss how we can study the SME in a cosmological setting

Graduate seminar, 11th December

Speaker: Szymon Domański

Title: Application of the ultrahigh dose thermoluminescence dosimetry for radiation-hardness testing

Abstract: In radiation processing, where large absorbed doses and dose rates from photon sources have to be measured with reasonable accuracy, dosimetry systems serve an important function. Proven methods are demanded to perform radiation measurements in development of new processes, validation, qualification, and verification of established processes and archival documentation of day to day processing uniformity. Implementation a system corresponding to recognised standards from scratch is not the simplest task. However, it is possible. During my presentation I wish to discuss the possible application of LiF:Mg,Cu,P thermoluminescence phosphor in the field of material testing.

Graduate Seminar, 27th Nov. 2017

Speaker: Paweł Kowalski

Title: Characteristics of the J-PET detector simulated using GATE software

Abstract: Novel PET system based on plastic scintillators is developed by the J-PET collaboration. In order to determine performance characteristics of built scanner prototype, advanced computer simulations must be performed. These characteristics are spatial resolution, scatter fraction and sensitivity. Results of simulations of these characteristics will be presented during the lecture.

Thesis topic proposal: Study of the intrinsic 3D-structure of the proton at CERN

           The structure of strongly interacting particles, like nucleons and mesons, is provided by the theory of strong interactions – Quantum Chromo-Dynamics (QCD). In the framework of QCD the internal structure and properties of nucleons and mesons are determined by the interactions between their elementary constituents, quarks and gluons (commonly referred to as ‘partons’).

Continue reading Thesis topic proposal: Study of the intrinsic 3D-structure of the proton at CERN

Graduate seminar, 20th November

Speaker: Rahul Nair

Title: Event Shape Engineering Technique in ultra-relativistic nuclear collisions

Abstract: The evolution of the system created in a high energy nuclear collision is very sensitive to the fluctuations in the initial geometry of the system. Utilizing these large fluctuations, one can select events corresponding to a specific initial shape. This method is called Event Shape Engineering. It provides an opportunity for the quantitative test of the theory of high energy nuclear collisions and understanding the properties of high density hot QCD matter. The technique will be illustrated on the grounds lead ion collisions in ALICE at LHC.

Graduate Seminar, 13th November

Speaker: Adam Cichoński

Title: Internal dosimetry in nuclear medicine treatment.

Abstract: Internal radiotherapy in oncology is therapeutic method of increasing importance. Despite many technical difficulties, possibilities which are given by this method, makes it extremely interesting. One of the most important tasks is prediction amount of radiation dose that patient will receive during treatment. That’s more important than determining the radiation dose that patient receives post factum. There is no reliable model to allow prediction of radiation dose as precisely as it is necessary for radiotherapy.

Graduate Seminar, 6th November

Speaker: Viktor Svensson

Title: Hydrodynamization of kinetic theory

Abstract: In ultrarelativistic heavy-ion collisions, hydrodynamics has been successfully applied to describe the evolution of the quark-gluon plasma. The applicability of hydrodynamics implies a significant reduction in the number of degrees of freedom. We study this reduction for a simple kinetic theory undergoing Bjorken flow.

 

Graduate Seminar, 23rd October

Speaker: Oleksandr Kovalenko

Title: “Chiral magnetic effect in nucleus-nucleus collisions at LHC energies”.

Abstract: The chiral magnetic effect (charge separation in strong magnetic field) is of great importance for QCD studies as it is a direct consequence of parity violation. Main observables and collision parameters that are used in ultra relativistic heavy ion physics will be presented. The most recent results on the Chiral Magnetic Effect in nucleus-nucleus collisions will be reviewed.

Graduate Seminar, 16th October

Speaker: Erik Kofoed

Title: Chiral Perturbation Theory for Neutron-antineutron Oscillations

Abstract: Neutron-antineutron oscillations is a possible consequence of baryon number violating physics. Transition matrix elements for oscillations can be calculated numerically, up to an overall scale, with lattice simulations. Such simulations contain artefacts such as choice of unphysical pion masses and finite volume effects. In order to estimate the impact of these artefacts we compute the matrix element in Chiral Perturbation Theory in both infinite and finite volume and at a variable pion mass.