IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
artículos
Título:
On the evolution of the momentarily static radiation free data in the Apostolatos?Thorne cylindrical shell model
Autor/es:
REINALDO J GLEISER; MARCOS A. RAMIREZ
Revista:
CLASSICAL AND QUANTUM GRAVITY
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2014 p. 1 - 25
ISSN:
0264-9381
Resumen:
In this paper we study the evolution of the ?Momentarily Static and Radiation
Free? (MSRF) initial data for the Apostolatos?Thorne cylindrical shell model.
After briefly reviewing the equations of motion, the definition of the MSRF
initial data and of its relation to the static solution that corresponds to the
given conserved intrinsic parameters of the shell, we show that for MSRF
data the initial acceleration of the shell is always directed towards the static
radius.We analyse in detail the relation between the parameters characterizing
the configuration corresponding to the initial data and those for the assumed
final static configuration, and show that, once the appropriate properties of
the solutions of the cylindrical wave equation are taken into account, there is
a priori no conflict for any choice of initial MSRF data, in contrast with some
recent results of Nakao, Ida and Kurita. To obtain a more detailed description
of the evolution we consider the case where the problem can be analysed in
the linear approximation, and show that the evolution is stable in all cases. The
possible form of the approach to the final static configuration is also analysed.
We find that this approach is very slow, with an inverse logarithmic dependence
on time at fixed radius. Given the absence of analytic solutions for the problem,
we introduce a numerical computation procedure that allows us to visualize the
explicit form of the evolution of the shell and the gravitational field up to large
times. The results are in agreement with the qualitative behaviour conjectured
by Apostolatos and Thorne, with an initial damped oscillatory stage, but we
find that these oscillations are not about the final static radius but rather about
a position that approaches slowly that of the static final state, as indicated by
our analysis. We also include one appendix, where we review some properties
of the solutions of the cylindrical wave equation, and prove the existence of
solutions with vanishing initial value for r > R0, (R0 > 0 some finite constant),
that approach a constant value for large times. This result is crucial for the proof
of compatibility of arbitrary MSRF initial data and a final static configuration
for the system. In a second appendix we discuss in detail the reasons for the
discrepancy between our results and some aspects of the related work by both
Apostolatos and Thorne, and by Nakao, Ida and Kurita.no conflict for any choice of initial MSRF data, in contrast with some
recent results of Nakao, Ida and Kurita. To obtain a more detailed description
of the evolution we consider the case where the problem can be analysed in
the linear approximation, and show that the evolution is stable in all cases. The
possible form of the approach to the final static configuration is also analysed.
We find that this approach is very slow, with an inverse logarithmic dependence
on time at fixed radius. Given the absence of analytic solutions for the problem,
we introduce a numerical computation procedure that allows us to visualize the
explicit form of the evolution of the shell and the gravitational field up to large
times. The results are in agreement with the qualitative behaviour conjectured
by Apostolatos and Thorne, with an initial damped oscillatory stage, but we
find that these oscillations are not about the final static radius but rather about
a position that approaches slowly that of the static final state, as indicated by
our analysis. We also include one appendix, where we review some properties
of the solutions of the cylindrical wave equation, and prove the existence of
solutions with vanishing initial value for r > R0, (R0 > 0 some finite constant),
that approach a constant value for large times. This result is crucial for the proof
of compatibility of arbitrary MSRF initial data and a final static configuration
for the system. In a second appendix we discuss in detail the reasons for the
discrepancy between our results and some aspects of the related work by both
Apostolatos and Thorne, and by Nakao, Ida and Kurita.r > R0, (R0 > 0 some finite constant),
that approach a constant value for large times. This result is crucial for the proof
of compatibility of arbitrary MSRF initial data and a final static configuration
for the system. In a second appendix we discuss in detail the reasons for the
discrepancy between our results and some aspects of the related work by both
Apostolatos and Thorne, and by Nakao, Ida and Kurita.