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Determinantal point process

From Wikipedia, the free encyclopedia

In mathematics, a determinantal point process is a stochastic point process, the probability distribution of which is characterized as a determinant of some function. Such processes arise as important tools in random matrix theory, combinatorics, physics,[1] and wireless network modeling.[2][3][4]

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Definition

Let be a locally compact Polish space and be a Radon measure on . Also, consider a measurable function .

We say that is a determinantal point process on with kernel if it is a simple point process on with a joint intensity or correlation function (which is the density of its factorial moment measure) given by

for every n ≥ 1 and x1, ..., xn ∈ Λ.[5]

Properties

Existence

The following two conditions are necessary and sufficient for the existence of a determinantal random point process with intensities ρk.

  • Symmetry: ρk is invariant under action of the symmetric group Sk. Thus:
  • Positivity: For any N, and any collection of measurable, bounded functions , k = 1, ..., N with compact support:
    If
    Then [6]

Uniqueness

A sufficient condition for the uniqueness of a determinantal random process with joint intensities ρk is

for every bounded Borel A ⊆ Λ.[6]

Examples

Gaussian unitary ensemble

The eigenvalues of a random m × m Hermitian matrix drawn from the Gaussian unitary ensemble (GUE) form a determinantal point process on with kernel

where is the th oscillator wave function defined by

and is the th  Hermite polynomial. [7]

Poissonized Plancherel measure

The poissonized Plancherel measure on integer partition (and therefore on Young diagramss) plays an important role in the study of the longest increasing subsequence of a random permutation. The point process corresponding to a random Young diagram, expressed in modified Frobenius coordinates, is a determinantal point process on + 12 with the discrete Bessel kernel, given by:

where
For J the Bessel function of the first kind, and θ the mean used in poissonization.[8]

This serves as an example of a well-defined determinantal point process with non-Hermitian kernel (although its restriction to the positive and negative semi-axis is Hermitian).[6]

Uniform spanning trees

Let G be a finite, undirected, connected graph, with edge set E. Define Ie:E → 2(E) as follows: first choose some arbitrary set of orientations for the edges E, and for each resulting, oriented edge e, define Ie to be the projection of a unit flow along e onto the subspace of 2(E) spanned by star flows.[9] Then the uniformly random spanning tree of G is a determinantal point process on E, with kernel

.[5]

References

  1. ^ Vershik, Anatoly M. (2003). Asymptotic combinatorics with applications to mathematical physics a European mathematical summer school held at the Euler Institute, St. Petersburg, Russia, July 9-20, 2001. Berlin [etc.]: Springer. p. 151. ISBN 978-3-540-44890-7.
  2. ^ Miyoshi, Naoto; Shirai, Tomoyuki (2016). "A Cellular Network Model with Ginibre Configured Base Stations". Advances in Applied Probability. 46 (3): 832–845. doi:10.1239/aap/1409319562. ISSN 0001-8678.
  3. ^ Torrisi, Giovanni Luca; Leonardi, Emilio (2014). "Large Deviations of the Interference in the Ginibre Network Model" (PDF). Stochastic Systems. 4 (1): 173–205. doi:10.1287/13-SSY109. ISSN 1946-5238.
  4. ^ N. Deng, W. Zhou, and M. Haenggi. The Ginibre point process as a model for wireless networks with repulsion. IEEE Transactions on Wireless Communications, vol. 14, pp. 107-121, Jan. 2015.
  5. ^ a b Hough, J. B., Krishnapur, M., Peres, Y., and Virág, B., Zeros of Gaussian analytic functions and determinantal point processes. University Lecture Series, 51. American Mathematical Society, Providence, RI, 2009.
  6. ^ a b c A. Soshnikov, Determinantal random point fields. Russian Math. Surveys, 2000, 55 (5), 923–975.
  7. ^ B. Valko. Random matrices, lectures 14–15. Course lecture notes, University of Wisconsin-Madison.
  8. ^ A. Borodin, A. Okounkov, and G. Olshanski, On asymptotics of Plancherel measures for symmetric groups, available via arXiv:math/9905032.
  9. ^ Lyons, R. with Peres, Y., Probability on Trees and Networks. Cambridge University Press, In preparation. Current version available at http://mypage.iu.edu/~rdlyons/
This page was last edited on 3 March 2024, at 18:34
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