ELFT HÍRADÓ

[StatFizSzeminar <statfiz AT glu.elte.hu>]

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           ELTE TTK Fizikai Intézet
       STATISZTIKUS FIZIKAI SZEMINÁRIUM


              2019. június 5.

                   szerda 

                   11.00

               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
        honlap: http://glu.elte.hu/~statfiz

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