A method for evaluating the expectation value of a power spectrum using the probability density function of phases

G. A. Caliandro, D. F. Torres, N. Rea

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Here, we present a new method to evaluate the expectation value of the power spectrum of a time series. A statistical approach is adopted to define the method. After its demonstration, it is validated showing that it leads to the known properties of the power spectrum when the time series contains a periodic signal. The approach is also validated in general with numerical simulations. The method puts into evidence the importance that is played by the probability density function of the phases associated to each time stamp for a given frequency, and how this distribution can be perturbed by the uncertainties of the parameters in the pulsar ephemeris. We applied this method to solve the power spectrum in the case the first derivative of the pulsar frequency is unknown and not negligible. We also undertook the study of the most general case of a blind search, in which both the frequency and its first derivative are uncertain. We found the analytical solutions of the above cases invoking the sum of Fresnel's integrals squared. © 2013 IOP Publishing Ltd and Sissa Medialab srl.
    Original languageEnglish
    Article number015
    JournalJournal of Cosmology and Astroparticle Physics
    Volume2013
    Issue number7
    DOIs
    Publication statusPublished - 1 Jul 2013

    Keywords

    • Gamma ray experiments
    • Neutron stars

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