Vorträge
14. Feb. 2014 Invitation to CCSA–Lectures:
Quarks and gluons on the lattice: simulating the strong force on supercomputers
Sprecher: Dr. Karl Jansen (NIC, DESY Zeuthen)
Ort: Rudower Chaussee 25, Room 2.417
Beginn: 10 a.m.Ende: 11 a.m.
The strong interactions of elementary particles are described theoretically in the framework of Quantum Chromodynamics (QCD).
The most promising way to solve QCD is given by numerical simulations using Monte Carlo Methods in which the space-time
continuum is replaced by a lattice. We shall demonstrate that since the invention of this approach by K. Wilson the conceptual,
algorithmic and computer developments have progressed so much that today realistic simulations of lattice-QCD become possible,
bringing us close to a, at least, numerical solution of QCD. As an example, we will show results for the hadron spectrum.
In addition, we will discuss the application of Quasi Monte Carlo methods for simulating Euclidean quantum mechanical systems.
27. Nov. 2013 CCSA–Vortrag:
Recent analytical and numerical approaches to investigate fluctuation-induced phenomena
Sprecher: Dr. Francesco Intravaia
Ort: Gerthsen lecture hall (1 201) of the HU physics building
Beginn: 15:30
Dr. Francesco Intravaia is visiting the Theoretical Optics & Photonics group with a Humboldt scholarship.
He is a very well-known expert in the theory of fluctuation-induced interactions and will be sharing his insights
in the framework of a lecture series consisting of four lectures, each about 45 minutes followed discussions
20. Nov. 2013 CCSA–Vortrag:
The theory of fluctuation-induced interactions: Relevant aspects and controversies
Sprecher: Dr. Francesco Intravaia
Ort: Gerthsen lecture hall (1 201) of the HU physics building
Beginn: 15:30
Dr. Francesco Intravaia is visiting the Theoretical Optics & Photonics group with a Humboldt scholarship.
He is a very well-known expert in the theory of fluctuation-induced interactions and will be sharing his
insights in the framework of a lecture series consisting of four lectures, each about 45 minutes followed discussions.
13. Nov. 2013 CCSA–Vortrag:
Fluctuation-induced phenomena the interface between atoms, photons and solids
Sprecher: Dr. Francesco Intravaia
Ort: Gerthsen lecture hall (1 201) of the HU physics building
Beginn: 15:30
Dr. Francesco Intravaia is visiting the Theoretical Optics & Photonics group with a Humboldt scholarship.
He is a very well-known expert in the theory of fluctuation-induced interactions and will be sharing his insights in
the framework of a lecture series consisting of four lectures, each about 45 minutes followed discussions.
06. Nov. 2013 CCSA–Vortrag:
Equilibrium and non equilibrium fluctuation-induced interactions between solids
Sprecher: Dr. Francesco Intravaia
Ort: Gerthsen lecture hall (1 201) of the HU physics building
Beginn: 15:30
Dr. Francesco Intravaia is visiting the Theoretical Optics & Photonics group with a Humboldt scholarship.
He is a very well-known expert in the theory of fluctuation-induced interactions and will be sharing his insights in
the framework of a lecture series consisting of four lectures, each about 45 minutes followed discussions.
23. Okt. 2013 CCSA–Vortrag:
Low Frequency Electromagnetic Scattering
Sprecher: Dr. L. Weggler \
Ort: Humboldt-Kabinett, Rudower Chaussee 25 \
Beginn: 15:15Ende: 16:00
The numerical solution for the electric field integral equation by a Galerkin Method becomes inaccurate in the
frequency range where the largest dimension of the surface is much smaller than a wavelength. This problem is commonly
known as the low frequency breakdown. In praxis, this means that the condition number of the system matrix explodes
with both iterative and direct solvers failing. One category of stabilization techniques is related to the continuity
equation. In this talk, the so-called CE stabilization is analysed and theoretical considerations are confirmed by
numerical examples.
23. Okt. 2013 CCSA–Vortrag:
Multiphysical Modeling and Numerical Simulation of Flow
Sprecher: Prof. Dr. C. Tischendorf
Ort: Humboldt-Kabinett, Rudower Chaussee 25
Beginn: 16:30Ende: 17:30
We discuss a multiphysical modeling of electric networks, gas and water distribution networks as well as blood circuits.
Depending on the network topology and the modeling level, we obtain a system of differential equations, differential
algebraic equations, partial differential equations or couplings thereof. We present qualitative and structural properties
of these systems and their effects onto the numerical simulation.
In particular, we will show that the numerical results do not only depend on the type of the differential equation system
and the choice of the numerical method but also significantly on the model formulation. Finally, we address problems to
be solved for a successful and robust simulation of such systems concerning linear solvers, nonlinear solvers, numerical
methods and the automatic generation of the model equations.
06. Feb. 2013 CCSA–Vortrag:
Computational routes towards materials discovery
Sprecher: Dr. Claudia Draxl (Humboldt-Universität zu Berlin Department of Physics)
Ort: Humboldt-Kabinett Johann-von-Neumann-Haus, Rudower Chaussee 25,
Beginn: 15:00
We discuss a multiphysical modeling of electric networks, gas and water distribution networks as well as blood circuits.
Depending on the network topology and the modeling level, we obtain a system of differential equations, differential
algebraic equations, partial differential equations or couplings thereof. We present qualitative and structural properties
of these systems and their effects onto the numerical simulation.
In particular, we will show that the numerical results do not only depend on the type of the differential equation system
and the choice of the numerical method but also significantly on the model formulation. Finally, we address problems to
be solved for a successful and robust simulation of such systems concerning linear solvers, nonlinear solvers, numerical
methods and the automatic generation of the model equations.
Ältere Vorträge der CCSA finden Sie im Archiv unter Vorträge.
