Kostas Kokkotas
Research Interests
Pulsating Relativistic Stars
In collaboration with Bernard Schutz (Cardiff) and more recently
with Nils Andersson (Cardiff) and Yasufumi Kojima (Hiroshima)
we have studied the Quasi-Normal Modes of Pulsating Relativistic Stars.
Two quite interesting results are the following:
We have found a new family of normal mode frequencies the w-modes
which are mainly modes of the spacetime and not of the fluid.
These modes have no analog in Newtonian theory.
We have proven the existence of Axial Modes for normal stars, and
we have shown that they are practically spacetime modes.
In collaboration with Gerhard Schaefer (Jena) we study the
PN stellar oscillations.
Coalescing Binaries
In collaboration with Gerhard Schaefer (Jena) we have studied the
effects of tides and of tidal resonances in the evolution of close
binary systems. This work continues in the direction of using higher
PN terms in the desctription of binary evolution.
In collaboration with Nicolas Spyrou (Thessaloniki)
we have studied the
influence of internal characteristics of the stars in the evolution
of the binary systems and the energy loss.
Gravitational Wave Data Analysis
In collaboration with Andrzej Krolak (Warsaw),
George Tsegas (Thessaloniki), Gerhard Schaefer (Jena) and later
Piotr Jaranowski (Bialystock) we have studied and continue the research
on the
statistical analysis of the estimatiors of the Newtonian and post-Newtonian
parameters of the gravitational
wave signal from a coalescing binary from one or a network of detectors.
Quantum Groups
In collaboration with Dennis Bonatsos (Athens) and
Costas Daskaloyannis (Thessaloniki)
we have studied:
The WKB equivalent potentials for q-deformed harmonic and anharmonic oscillators.
Deformed Oscillator Algebras for 2-dimensional quantum superintegrable
systems