115 citations · 744 across the 44 of their papers we have counts for
44 papers
Periodic orbits in a near Yang-Mills potential
George Contopoulos, Mirella Harsoula
We consider the orbits in the Yang-Mills (YM) potential V=1/2 x2 y2 and in the potentials of the general form Vg=1/2 [α (x2 +y2)+x2 y2]. The stable period-9 (number of intersection…
The spiral arms of galaxies
George Contopoulos
The most important theory of the spiral arms of galaxies is the density wave theory based on the Lin-Shu dispersion relation. However, the density waves move with the group velocit…
Perturbed precessing ellipses as the building blocks of spiral arms in a barred galaxy with two pattern speeds
M. Harsoula, C. Efthymiopoulos, G. Contopoulos +1
Observations and simulations of barred spiral galaxies have shown that, in general, the spiral arms rotate at a different pattern speed to that of the bar. The main conclusion from…
Interference with non-interacting free particles and a special type of detector
Ioannis Contopoulos, Athanasios C. Tzemos, Foivos Zanias +1
We develop a classical picture of interference for non-interacting individual classical massive free particles. As long as they remain undetected, particles carry the information o…
Chaotic trajectories in complex Bohmian systems
Athanasios C. Tzemos, George Contopoulos
We consider the Bohmian trajectories in a 2-d quantum harmonic oscillator with non commensurable frequencies whose wavefunction is of the form $Ψ=aΨ_{m_1,n_1}(x,y)+bΨ_{m_2,n_2}(x,y…
Chaos in 2-d Bohmian Trajectories
Athanasios C. Tzemos, George Contopoulos
We make a short review of the most general mechanism for the generation of chaos in 2-d Bohmian trajectories, the so called `nodal point-X-point complex' (NPXPC) mechanism. The pre…