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[Fizinfo] Stat Fiz Szeminarium

Chronological Thread 
  • From: StatFizSzeminar <statfiz AT>
  • To: fizinfo AT
  • Subject: [Fizinfo] Stat Fiz Szeminarium
  • Date: Thu, 30 May 2019 21:46:38 +0200

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ELTE TTK Fizikai Intézet

2019. június 5.



Tamás Kovács

Department of Theoretical Physics, ELTE

"The role of the surrogate time series
in exoplanetary dynamics"

One of the main purposes in extrasolar plan-
etary research is to determine whether the
system in question is chaotic. The framework
of nonlinear time series analysis provides a
powerful method to scrutinize the data record-
ed from the system, even if we have no prior
information about the underlying dynamics. A
natural way to describe the stability is to
obtain the dynamical invariants such as Lya-
punov exponents or correlation dimension.
However, a reliable determination of these
measures requires fairly long and noiseless
time series that are usually unavailable in
real-world situations. To overcome this diffi-
culty one can introduce surrogate time series
together a null hypothesis we want to test
against. Surrogate time series are basically a
random copy of the system maintaining certain
properties defined by the null hypothesis. Dis-
criminating statistics can then be applied to
the original data and the surrogates to decide
nonlinearity. In this talk different kind of
surrogation methods are going to be discussed
together with their strengths and weaknesses.
Possible application to exoplanetary dynamics
will be also presented.

1117, Budapest, Pázmány P. sétány 1/A, Északi tömb 2.54

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