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Statistics of spectral properties of matrix-valued random variables.

9 votes
Accepted

Relationship between free probability and deterministic graphs?

I believe the relation between deterministic graphs and free probability you mentioned is not something generic. In fact, the main property of your matrix $M$ which makes connection with free probabil …
Adrien Hardy's user avatar
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6 votes
Accepted

Eigenvalue densities of sample covariance matrices when the population covariance matrix is ...

You can rewrite $$ S=\frac{1}{M}C^{1/2}XX^T(C^{1/2})^T $$ where $X_{.j}\sim \mathcal{N}(\boldsymbol 0, \boldsymbol I)$. It is then classical that the limiting eigenvalue distribution of $S$ (in the …
Adrien Hardy's user avatar
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4 votes

Why only three classical matrix ensembles in random matrix theory?

These three ensembles are hermitian matrices over a (finite dimensional real) field of numbers, and it is known that the only finite dimensional real fields are the real numbers, the complex numbers ( …
Adrien Hardy's user avatar
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4 votes
Accepted

How to draw a random normal matrix?

Any real normal matrix $M$ can be written as $M=O\,\mathrm{diag}(B_1,\ldots,B_\ell)\,O^t$ where $O$ is orthogonal and where the blocks $B_j$ are either $1\times 1$ real numbers or $2\times2$ matrices …
Adrien Hardy's user avatar
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2 votes
Accepted

rigidity of eigenvalues of circular ensemble

If I understand correctly, what you are looking for is Lemma 10 (when m=1) in http://arxiv.org/pdf/1210.2681v3.pdf by Elisabeth and Mark Meckes.
Adrien Hardy's user avatar
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2 votes

Semicircle law universality elsewhere

If you accept non-commutative random variables as "other random processes $(X_1,\ldots,X_n)$" then, as Jon Bannon's comment suggests, free probability could provide interesting examples [and I don't t …
Adrien Hardy's user avatar
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1 vote

Characteristic polynomials of certain random symmetric matrices and the complexity of rando...

Just an heuristic answer: The joint eigenvalue distribution of a GOE random matrix is given by $$ \frac{1}{Z_n}\prod_{i<j}|x_i-x_j|\prod_{i=1}^ne^{-x_i^2/2}dx_i. $$ Thus, $E_{GOE}(|\det(y+A)|e^{-x(tr …
1 vote

analogue of GUE and Ginibre in higher dimensions

By $\|z_1\|$, I understand you mean the maximal modulus of the $z_i$'s. If you are interested in the process of the $\|z_i\|$'s, you have no chance for a determinantal structure since you may have tw …
Adrien Hardy's user avatar
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1 vote

Estimate on lowest eigenvalue in GOE

By symmetry you're looking at the probability that the maximal eigenvalue is smaller than some number. Explicit inequalities for such events can be obtained by using the tridiagonal representation for …
Adrien Hardy's user avatar
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0 votes
Accepted

Limiting eigenvalue distribution of $(I-A)^T(I-A)$

I know that the limiting eigenvalue distribution satisfies a variational principle (see e.g. the joint work with A. Kuijlaars Large Deviations for a Non-Centered Wishart Matrix) from which you may der …
Adrien Hardy's user avatar
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