Results 11 to 20 of about 166,406,602 (248)

Applications of cosmological perturbation theory [PDF]

open access: yes, 2011
PhDCosmological perturbation theory is crucial for our understanding of the universe. The linear theory has been well understood for some time, however developing and applying the theory beyond linear order is currently at the forefront of research in
Christopherson, Adam J.
core   +4 more sources

On Weighted Ostrowski Type Inequalities for Operators and Vector-Valued Functions [PDF]

open access: yes, 2001
Some weighted Ostrowski type integral inequalities for operators and vector-valued functions in Banach spaces are given.
Cerone, Pietro   +3 more
core   +6 more sources

Existence of a solution of Hilfer fractional hybrid problems via new Krasnoselskii-type fixed point theorems

open access: yesOpen Mathematics, 2021
This work intends to treat the existence of mild solutions for the Hilfer fractional hybrid differential equation (HFHDE) with linear perturbation of first and second type in partially ordered Banach spaces. First, we establish the results concerning the
Gabeleh Moosa   +3 more
doaj   +1 more source

Unbounded B-Fredholm operators on Hilbert spaces [PDF]

open access: yes, 2008
This paper is concerned with the study of a class of closed linear operators densely defined on a Hilbert space H and called B-Fredholm operators.
Berkani, M.   +3 more
core   +1 more source

Holography Beyond AdS

open access: yesNuclear Physics B, 2018
We continue our study of string theory in a background that interpolates between AdS3 in the infrared and a linear dilaton spacetime R1,1×Rϕ in the UV.
Meseret Asrat   +3 more
doaj   +1 more source

Schrödinger operators with δ and δ′-potentials supported on hypersurfaces [PDF]

open access: yes, 2013
Self-adjoint Schrödinger operators with δ and δ′-potentials supported on a smooth compact hypersurface are defined explicitly via boundary conditions.
Lotoreichik, Vladimir   +2 more
core   +4 more sources

Divergences in open quantum systems

open access: yesJournal of High Energy Physics, 2018
We show that for cubic scalar field theories in five and more spacetime dimensions, and for the T = 0 limit of the Caldeira-Leggett model, the quantum master equation for long-wavelength modes initially unentangled from short-distance modes, and at ...
Cesar Agón, Albion Lawrence
doaj   +1 more source

Comments on the quantum field theory of the Coulomb gas formalism

open access: yesJournal of High Energy Physics, 2021
The holomorphic Coulomb gas formalism, as developed by Feigin-Fuchs, Dotsenko-Fateev and Felder, is a set of rules for computing minimal model observables using free field techniques. We attempt to derive and clarify these rules using standard techniques
Daniel Kapec, Raghu Mahajan
doaj   +1 more source

EXCITATION METHOD IN PROBLEMS OF REGRESSION OF A LINEAR MATRIX

open access: yesМіжнародний науково-технічний журнал "Проблеми керування та інформатики", 2020
In the framework of the theory of linear regression, linear from observations estimates are studied, in particular, the unbiased estimates, which lead to unbiased equations, among which the solutions are distinguished by the minimum norm, which allows ...
О.Г. Наконечний   +3 more
doaj   +1 more source

Does boundary quantum mechanics imply quantum mechanics in the bulk?

open access: yesJournal of High Energy Physics, 2018
Perturbative bulk reconstruction in AdS/CFT starts by representing a free bulk field ϕ (0) as a smeared operator in the CFT. A series of 1/N corrections must be added to ϕ (0) to represent an interacting bulk field ϕ.
Daniel Kabat, Gilad Lifschytz
doaj   +1 more source

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