Juan C. Vallejo, GMV/XMM-Newton
Profile
========
MS. Science in Astrophysics (1994), DEA (2002), Ph.D. (nearly finished).
Working at,
- ESAC, since 1999, with GMV Aerospace and Defence, in
Satellite Control Centers Division (MOC, FDS, SOC).
- University Rey Juan Carlos, since 2002, within the
Physics Department, as Partial Time Professor.
Science Interests
=================
Astrophysics and Non Linear Dynamics.
Orbit instability, mainly through finite time lyapunov exponents.
Research lines
=================
(Old) SFR at the local Universe, by surveying H-alpha excess galaxies.
(Current) Chaoticity indicators in hamiltonian potentials, mainly
applied to,
a) Galactic potentials (mainstream research line).
Studying the local Instability in the Henon-Heiles
potential and three-dimensional generalisations
(barred potentials and triaxial systems).
One of the goals of the Chaos theory applied to
galactic dynamics is the identification of the sets
of chaotic and regular orbits as constructive
blocks for the observed structures. The finite time
lyapunov exponents provide insight both into the
local and global properties of the dynamical flow,
allowing the classification of the regular and
chaotic regions, as well as the applicable
timescales.
b) MHD, planetary magnetic fields (spin-off research line).
The developed techniques are being applied to basic
plasmoids models and planetary magnetic fields
models in order to detect fractal structures and
global/local unstable regions. These are directly
related to areas with more or less population of
certain ions.
c) Fluid-flows (somehow stagnated research line). Study of
an adhoc hamiltonian model for modeling the flow
around a static/rotating cylinder in order to
observe how the chaotic structures on its wake were
modified by the rotation.
Main article
============
Vallejo, J.C, Aguirre, J., SanJuan, M.A.F., Characterization of the
local instability in the Henon-Heiles Hamiltonian, Phys. Let. A,
311, 26, (2003).