Research output: Contribution to journal › Article › peer-review
Small ball probabilities for gaussian random fields and tensor products of compact operators. / Karol, Andrei; Nazarov, Alexander; Nikitin, Yakov.
In: Transactions of the American Mathematical Society, Vol. 360, No. 3, 01.03.2008, p. 1443-1474.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Small ball probabilities for gaussian random fields and tensor products of compact operators
AU - Karol, Andrei
AU - Nazarov, Alexander
AU - Nikitin, Yakov
PY - 2008/3/1
Y1 - 2008/3/1
N2 - We find the logarithmic L2-small ball asymptotics for a large class of zero mean Gaussian fields with covariances having the structure of "tensor product". The main condition imposed on marginal covariances is the regular behavior of their eigenvalues at infinity that is valid for a multitude of Gaussian random functions including the fractional Brownian sheet, Ornstein - Uhlenbeck sheet, etc. So we get the far-reaching generalizations of well-known results by Csáki (1982) and by Li (1992). Another class of Gaussian fields considered is the class of additive fields studied under the supremum-norm by Chen and Li (2003). Our theorems are based on new results on spectral asymptotics for the tensor products of compact self-adjoint operators in Hilbert space which are of independent interest.
AB - We find the logarithmic L2-small ball asymptotics for a large class of zero mean Gaussian fields with covariances having the structure of "tensor product". The main condition imposed on marginal covariances is the regular behavior of their eigenvalues at infinity that is valid for a multitude of Gaussian random functions including the fractional Brownian sheet, Ornstein - Uhlenbeck sheet, etc. So we get the far-reaching generalizations of well-known results by Csáki (1982) and by Li (1992). Another class of Gaussian fields considered is the class of additive fields studied under the supremum-norm by Chen and Li (2003). Our theorems are based on new results on spectral asymptotics for the tensor products of compact self-adjoint operators in Hilbert space which are of independent interest.
KW - Brownian sheet
KW - Fractional Brownian motion
KW - Ornstein - Uhlenbeck sheet
KW - Slowly varying functions
KW - Small deviations
KW - Spectral asymptotics
KW - Tensor product of operators
UR - http://www.scopus.com/inward/record.url?scp=44649094637&partnerID=8YFLogxK
U2 - 10.1090/S0002-9947-07-04233-X
DO - 10.1090/S0002-9947-07-04233-X
M3 - Article
AN - SCOPUS:44649094637
VL - 360
SP - 1443
EP - 1474
JO - Transactions of the American Mathematical Society
JF - Transactions of the American Mathematical Society
SN - 0002-9947
IS - 3
ER -
ID: 36071854