SEMINAR
Tuesday 21 May 2013
Panos Patsis
Research Center for Astronomy and Applied Mathematics of the Academy of Athens
Backbones of stellar barred-spiral morphologies
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The Speed of Arnold Diffusion
Christos Efthymiopoulos, Mirella Harsoula
(to appear in Physica D)
Magnetic Energy and Helicity Budgets in the Active-Region Solar Corona. II. Nonlinear Force-Free Approximation
M. K. Georgoulis, K. Tziotziou, N.-E. Raouafi
The Magnetic Energy - Helicity Diagram of Solar Active Regions
Kostas Tziotziou, Manolis K. Georgoulis, Nour-Eddine Raouafi
Non-neutralized Electric Current Patterns in Solar Active Regions: Origin of the Shear-Generating Lorentz Force
Manolis K. Georgoulis, Viacheslav S. Titov, Zoran Mikic
The structure of phase space close to fixed points in a 4D symplectic map
L. Zachilas, M. Katsanikas, P. A. Patsis
A generalized growth index parametrization: Applications to the LamdaCDM using the WiggleZ growth data
Basilakos, S.
Order in de Broglie - Bohm Quantum Mechanics
Contopoulos, G., Delis, N., and Efthymiopoulos, C.
(To appear in J. Phys. A.: Math. Theor. pp 1-23)
On Our Ability to Predict Major Solar Flares
Georgoulis, M.K.
(To appear in
Astroph. Space Sci. Proc. V. N. Obridko, K. Georgieva, Yu. A. Nagovitsyn, Eds.)
A Consistent Comparison of Bias Models using Observational Data
A. Papageorgiou, M. Plionis, S. Basilakos, C. Ragone-Figueroa
To appear in MNRAS
Instabilities and stickiness in a 3D rotating galactic potential
M. Katsanikas, P.A. Patsis and G. Contopoulos
(to appear in IJBC)
Quantum Vortices and Trajectories in Particle Diffraction
N. Delis, C. Efthymiopoulos and G. Contopoulos
(to appear in an IJBC Special Issue edited by G. Nicolis, M. Robnik, V. Rothos and H. Skokos)
Dynamics and Constraints of the Massive Gravitons Dark Matter Flat Cosmologies
Basilakos, S., Plionis, M., Alves, M. E. S. and Lima, J. A. S.
Using the Noether symmetry approach to probe the nature of dark energy
Basilakos, S., Tsamparlis, M. and Paliathanasis, A.
Hubble expansion and structure formation in the "running FLRW model" of the cosmic evolution
Grande J., Sola, J., Basilakos S. and Plionis M.
Orbits in a non-Kerr Dynamical System
Contopoulos G., Lukes-Gerakopoulos G. and Apostolatos T.A.
(to appear in IJBC Special Issue edited by G. Nicolis, M. Robnik, V. Rothos and H. Skokos)
Structures out of Chaos in barred-spiral galaxies
Patsis P. A.
(Review paper to be published in IJBC)
Dynamical Mechanisms supporting Barred-Spiral Structures
Patsis P. A.
(AApTr 2012, 27, 113)
Chains of rotational tori and filamentary structures close to high multiplicity periodic orbits in a 3D galactic potential
Katsanikas, M., Patsis P. A. and Pinotsis A.
(IJBC, in press)
The structure and evolution of confined tori near a Hamiltonian Hopf Bifurcation
Katsanikas, M., Patsis P. A. and Contopoulos G.
(IJBC, in press)
The Generalized Uncertainty Principle and Quantum Gravity Phenomenology
Farag Ali, A., Das, S., Vagenas, E.C.
(Proceedings of the Eleventh Marcel Grossmann Meeting on General Relativity - World Scientific - in press)
The Speed of Arnold Diffusion
The phenomenon of Arnold diffusion is important in a number of applications in solar system dynamics and plasma physics. The above figure, published in Efthymiopoulos and Harsoula, Physica D, 2013 (in press), shows a visualization of Arnold diffusion in a set of variables arising after a so-called optimal normal form construction using a special computer-algebraic program. According to theory, at a crossing domain of multiple resonances, the normal form construction allows to express the equations of motion as a Hamiltonian system of two degrees of freedom. This is perturbed, however, by a third degree of freedom appearing in the so-called `remainder' of the normal form. After a very slow drift in this third dimension (corresponding, in the figure, to the long edge of the framed parallelepiped), the orbits by-pass the barriers (invariant tori) of the 2D dynamics, and thus transit from one resonance to another. The timescale for this phenomenon is millions, or billions of characteristic periods of the orbits (see Efthymiopoulos and Harsoula 2013 for details).
Workshop on "Fundamental Problems in Quantum Physics", NCSR `Demokritos', Wednesday, March 21, 2012
A workshop on "Fundamental Problems in Quantum Physics" will be held at the NCSR 'Demokritos' on Wednesday, March 21, 2012, in the framework of the COST action MP1006. The
workshop is co-organised by C. Efthymiopoulos, who is national representative in the management committee of the COST MP1006 Action.
The program is available here (PDF file)
RCAAM Activities Report for 2011 (in Greek)
Dark Matter Awareness Week 1-8 December 2010
The RCAAM is participating in the Dark Matter Awareness Week 2010 (DMAW2010) initiative organizing a special "Dark Matter in Galaxies" seminar by P.A. Patsis and C. Efthymiopoulos.
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