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On the Equivalence of Probability Spaces

Author

Listed:
  • Daniel Alpay

    (Ben-Gurion University of the Negev)

  • Palle Jorgensen

    (University of Iowa)

  • David Levanony

    (Ben Gurion University of the Negev)

Abstract

For a general class of Gaussian processes W, indexed by a sigma-algebra $${\mathscr {F}}$$ F of a general measure space $$(M,{\mathscr {F}}, \sigma )$$ ( M , F , σ ) , we give necessary and sufficient conditions for the validity of a quadratic variation representation for such Gaussian processes, thus recovering $$\sigma (A)$$ σ ( A ) , for $$A\in {\mathscr {F}}$$ A ∈ F , as a quadratic variation of W over A. We further provide a harmonic analysis representation for this general class of processes. We apply these two results to: (i) a computation of generalized Ito integrals and (ii) a proof of an explicit and measure-theoretic equivalence formula, realizing an equivalence between the two approaches to Gaussian processes, one where the choice of sample space is the traditional path space, and the other where it is Schwartz’ space of tempered distributions.

Suggested Citation

  • Daniel Alpay & Palle Jorgensen & David Levanony, 2017. "On the Equivalence of Probability Spaces," Journal of Theoretical Probability, Springer, vol. 30(3), pages 813-841, September.
  • Handle: RePEc:spr:jotpro:v:30:y:2017:i:3:d:10.1007_s10959-016-0667-7
    DOI: 10.1007/s10959-016-0667-7
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    References listed on IDEAS

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    1. Alpay, Daniel & Attia, Haim & Levanony, David, 2010. "On the characteristics of a class of Gaussian processes within the white noise space setting," Stochastic Processes and their Applications, Elsevier, vol. 120(7), pages 1074-1104, July.
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    Cited by:

    1. Daniel Alpay & Palle Jorgensen, 2022. "mu-Brownian Motion, Dualities, Diffusions, Transforms, and Reproducing Kernel Hilbert Spaces," Journal of Theoretical Probability, Springer, vol. 35(4), pages 2757-2783, December.

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    1. Daniel Alpay & Palle Jorgensen, 2022. "mu-Brownian Motion, Dualities, Diffusions, Transforms, and Reproducing Kernel Hilbert Spaces," Journal of Theoretical Probability, Springer, vol. 35(4), pages 2757-2783, December.
    2. Alpay, Daniel & Salomon, Guy, 2013. "Non-commutative stochastic distributions and applications to linear systems theory," Stochastic Processes and their Applications, Elsevier, vol. 123(6), pages 2303-2322.

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