Results 11 to 20 of about 19,025 (294)
Time-resolved optical measurements with spread spectrum excitation [PDF]
Optics Letters, 2002 We propose a novel method for measuring time-dependent optical quantities. A train of excitation pulses modulated by a pseudorandom bit sequence is used as the light source, and a cross-correlation scheme is used to retrieve the impulse response. Simulation results of the temporal point-spread function of a diffusive wave are provided, as well as ...
Nan Guang, Chen, Quing, Zhu
openaire +2 more sources
Semiclassical analysis for the Kramers-Fokker-Planck equation [PDF]
, 2004 We study some accurate semiclassical resolvent estimates for operators that are neither selfadjoint nor elliptic, and applications to the Cauchy problem.
Herau, Frederic +2 more
core +7 more sources
Fermion determinants in matrix models of QCD at nonzero chemical potential [PDF]
, 1997 The presence of a chemical potential completely changes the analytical structure of the QCD partition function. In particular, the eigenvalues of the Dirac operator are distributed over a finite area in the complex plane, whereas the zeros of the ...
A. D. Jackson +35 more
core +2 more sources
Some remarks on degenerate hypoelliptic Ornstein-Uhlenbeck operators [PDF]
, 2014 37 pages, 3 figuresInternational audienceWe study degenerate hypoelliptic Ornstein-Uhlenbeck operators in $L^2$ spaces with respect to invariant measures.
Ottobre, M. +2 more
core +5 more sources
Electronic Journal of Qualitative Theory of Differential Equations, 2013 The existence and compactness of the resolvent are studied in this paper. One of the main results is the criterion of discreteness of the spectrum of a hyperbolic singular differential operator.
Mussakan Muratbekov +2 more
doaj +1 more source
Direct and inverse spectral problems for Dirac systems with nonlocal potentials [PDF]
Opuscula Mathematica, 2019 The main purposes of this paper are to study the direct and inverse spectral problems of the one-dimensional Dirac operators with nonlocal potentials. Based on informations about the spectrum of the operator, we find the potential and recover the form of
Kamila Dębowska, Leonid P. Nizhnik
doaj +1 more source
Dependence of the spectrum of a quantum graph on vertex conditions and edge lengths [PDF]
, 2011 We study the dependence of the quantum graph Hamiltonian, its resolvent, and its spectrum on the vertex conditions and graph edge lengths. In particular, several results on the interlacing (bracketing) of the spectra of graphs with different vertex ...
Berkolaiko, Gregory, Kuchment, Peter
core +2 more sources
Discreteness of the spectrum of the compactified D=11 supermembrane with non-trivial winding [PDF]
, 2002 We analyze the Hamiltonian of the compactified D=11 supermembrane with non-trivial central charge in terms of the matrix model constructed recently by some of the authors.
A. Restuccia +20 more
core +2 more sources
Properties and for Bounded Linear Operators
Journal of Mathematics, 2013 We shall consider properties which are related to Weyl type theorem for bounded linear operators , defined on a complex Banach space . These properties, that we call property , means that the set of all poles of the resolvent of of finite rank in the ...
M. H. M. Rashid
doaj +1 more source
Eigenvalue estimates for operators with finitely many negative squares [PDF]
Opuscula Mathematica, 2016 Let \(A\) and \(B\) be selfadjoint operators in a Krein space. Assume that the resolvent difference of \(A\) and \(B\) is of rank one and that the spectrum of \(A\) consists in some interval \(I\subset\mathbb{R}\) of isolated eigenvalues only.
Jussi Behrndt +2 more
doaj +1 more source