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Quantum Field Theory - Why and When?
Quantum Field Theory - Why and When?

Ultracold atoms as quantum simulators for new materials – synthetic
Ultracold atoms as quantum simulators for new materials – synthetic

... Simplest explanation for time of flight pictures: The wavefunction is unchanged, TOF pictures show momentum distribution. Alternative description: Canonical momentum p=-i ! becomes mechanical momentum Mechanical momentum changes from p – A to p Momentum change by A can be described by synthetic ele ...
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9/25 - SMU Physics

Interaction with the radiation field
Interaction with the radiation field

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Glasgow2004

Program - LQG
Program - LQG

... just the naïve expectation value of a ``metric operator'' on the quantum state of geometry. In fact, if the matter sector consists of as simple a species as a massive real scalar field, then the emergent classical metric appears differently to different modes of the field: specifically, the emergent ...
Massachusetts Institute of Technology
Massachusetts Institute of Technology

Lecture notes for FYS610 Many particle Quantum Mechanics
Lecture notes for FYS610 Many particle Quantum Mechanics

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Characteristic Functions and the Uncertainty Principle
Characteristic Functions and the Uncertainty Principle

Simplify and Evaluate Algebraic Expressions, November 15, 2011
Simplify and Evaluate Algebraic Expressions, November 15, 2011

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Title: Some Combinatorial Problems Inherent in and Related

The Mass Spectrophotometer
The Mass Spectrophotometer

... So... a B field is used to balance the Fele What direction should the B field be so that it can balance the Fele??????????(think 2nd RHR) ...
vander waals forces in an inhomogeneous dielectric
vander waals forces in an inhomogeneous dielectric

... The contribution of the long wave fluctuations to the free energy is small compared with the total free energy of the body. However, they lead to a qualitatively new effect: the non-additivity of the free energy of the body. Indeed, each change of the density and, consequently, in the dielectric con ...
Multi-Electron Atoms Helium Schrödinger Equation
Multi-Electron Atoms Helium Schrödinger Equation

... Particle Exchange Symmetry Introduce the particle exchange operator: … switches particles i and j. e.g. ...
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Dr David M. Benoit (david.benoit@uni

WHAT IS A PHOTON? Spontaneous emission
WHAT IS A PHOTON? Spontaneous emission

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Recitation 2 - MIT OpenCourseWare

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Sep 17 - BYU Physics and Astronomy

Supercomputing in High Energy Physics
Supercomputing in High Energy Physics

... • Even with the Higgs, the Standard Model requires unreasonable fine tuning of parameters to avoid ~ infinite Higgs masses from quantum corrections ...
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Sects. 6.5 through 6.9

Comment on" On the realisation of quantum Fisher information"
Comment on" On the realisation of quantum Fisher information"

Quantum Dots in Photonic Structures
Quantum Dots in Photonic Structures

< 1 ... 127 128 129 130 131 132 133 134 135 ... 156 >

Propagator

In quantum mechanics and quantum field theory, the propagator gives the probability amplitude for a particle to travel from one place to another in a given time, or to travel with a certain energy and momentum. In Feynman diagrams, which calculate the rate of collisions in quantum field theory, virtual particles contribute their propagator to the rate of the scattering event described by the diagram. They also can be viewed as the inverse of the wave operator appropriate to the particle, and are therefore often called Green's functions.
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