Results 41 to 50 of about 7,625,136 (322)
Linearisation with Cosmological Perturbation Theory [PDF]
, 2012 We propose a new method to linearise cosmological mass density fields using higher order Lagrangian perturbation theory (LPT). We demonstrate that a given density field can be expressed as the sum of a linear and a nonlinear component which are tightly ...
Angulo +40 more
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PERTURBATIVE QUANTUM FIELD THEORY [PDF]
Challenges for the 21st Century, 2001 This talk introduces perturbative quantum field on a heuristic level. It is directed at an audience familiar with elements of quantum mechanics, but not necessarily with high energy physics. It includes a discussion of the strategies behind experimental tests of fundamental theories, and of the field theory interpretations of these tests.
openaire +3 more sources
Massive renormalization scheme and perturbation theory at finite temperature
Physics Letters B, 2015 We argue that the choice of an appropriate, massive, renormalization scheme can greatly improve the apparent convergence of perturbation theory at finite temperature.
Jean-Paul Blaizot, Nicolás Wschebor
doaj +1 more source
Physical Review X, 2021 Thanks to the nearsightedness principle, the low-energy electronic structure of solids can be represented by localized states such as the Wannier functions.
Jae-Mo Lihm, Cheol-Hwan Park
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Nonperturbative Effects from the Resummation of Perturbation Theory [PDF]
, 2001 Using the general argument in Borel resummation of perturbation theory that links the divergent perturbation theory to the nonperturbative effect we argue that the nonperturbative effect associated with the perturbation theory should have a branch cut ...
A.H. Mueller +27 more
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High-throughput density-functional perturbation theory phonons for inorganic materials
Scientific Data, 2018 The knowledge of the vibrational properties of a material is of key importance to understand physical phenomena such as thermal conductivity, superconductivity, and ferroelectricity among others.
G. Petretto +9 more
semanticscholar +1 more source
Cosmological perturbation theory
, 2004 This is a review on cosmological perturbation theory. After an introduction, it presents the problem of gauge transformation. Gauge invariant variables are introduced and the Einstein and conservation equations are written in terms of these variables ...
R. Durrer, T. Kanazawa, V. F. Mukhanov
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Closed form bound-state perturbation theory
International Journal of Mathematics and Mathematical Sciences, 1980 The perturbed Schrödinger eigenvalue problem for bound states is cast into integral form using Green's Functions. A systematic algorithm is developed and applied to the resulting equation giving rise to approximate solutions expressed as functions of the
Ollie J. Rose, Carl G. Adler
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Long Wavelength Coherency in Well Connected Electric Power Networks
IEEE Access, 2022 We investigate coherent oscillations in large scale transmission power grids, where large groups of generators respond in unison to a distant disturbance. Such long wavelength coherent phenomena are known as inter-area oscillations.
Julian Fritzsch, Philippe Jacquod
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Perturbation theory in nonstandard cosmology [PDF]
, 2019 We study inhomogeneous perturbations away from the strongly homogeneous background cosmology previously studied. The problem is greatly simplified by using the mapping on the inner Schwarzschild solution.
Scharf, Günter
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