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... two additional lasers to their MOT, alternated the polarization of the laser light interacting with the molecules, and rapidly reversed the direction of the magnetic field around the he Ye group has opened a new gateway into the rela- molecules. This combination allowed them to “talk to” multively u ...
Remarks on the fact that the uncertainty principle does not
Remarks on the fact that the uncertainty principle does not

... many square matrices of increasing dimension. A supplementary difficulty is actually lurking in the shadows: these conditions are sensitive to the value of Planck’s constant when the latter is used as a variable parameter: a given operator ρ̂ might thus very well be positive for one value of h̄ and ...
Electron Spin or “Classically Non-Describable Two - Philsci
Electron Spin or “Classically Non-Describable Two - Philsci

... This clearly says that a classical electron model cannot reproduce the observable quantities, mass, charge, angular momentum, and magnetic moment, without running into severe contradictions with Special Relativity.8 The electron model they had in mind was that developed by Abraham in his 1903 classi ...
Wednesday, Mar. 26, 2014
Wednesday, Mar. 26, 2014

Bose-Einstein Condensation - Department of Physics, Panjab
Bose-Einstein Condensation - Department of Physics, Panjab

... Efimov’s prediction that the binding of few particles is universal has also been confirmed experimentally (Berninger et al, Phys. Rev. Lett 107, 120401 (2011)). It is this concept of universality which makes Efimov physics possible in various physical systems, such as, atomic physics, nuclear physi ...
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Recently an undergraduate engineering student asked me if

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... This is distinct evidence that electrons are interfering, a wave-like behavior The interference pattern becomes clearer as the number of electrons reaching the screen increases ...
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Full Text PDF

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if on the Internet, press on your browser to

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... range set by the average magnitude of the random Overhauser 共nuclear兲 field. We then consider the effect of fast control of the local electrostatic potentials of double quantum dots and show how this may be used to perform exchange gates,3,10,25 and to prepare and measure two-spin entangled states.2 ...
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... N ! `, M r0  does not depend on the initial field state r0 , and its eigenvalues are 0 and 1. In the following, we will consider the vacuum j0 as initial field state, so that M r0   M 00 . In this case, it is useful to look also at the time-reversed process: Given an arbitrary field state jx ...
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... Actually this interaction is so weak that two 4 He atoms are very weakly bound, while two 3 He atoms are not bound at all. Notice also that the interaction between the atoms is due to the polarization of the electronic cloud, and as consequence the interaction between 4 He-4 He, 3 He-3 He, and 4 He- ...
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Renormalization group



In theoretical physics, the renormalization group (RG) refers to a mathematical apparatus that allows systematic investigation of the changes of a physical system as viewed at different distance scales. In particle physics, it reflects the changes in the underlying force laws (codified in a quantum field theory) as the energy scale at which physical processes occur varies, energy/momentum and resolution distance scales being effectively conjugate under the uncertainty principle (cf. Compton wavelength).A change in scale is called a ""scale transformation"". The renormalization group is intimately related to ""scale invariance"" and ""conformal invariance"", symmetries in which a system appears the same at all scales (so-called self-similarity). (However, note that scale transformations are included in conformal transformations, in general: the latter including additional symmetry generators associated with special conformal transformations.)As the scale varies, it is as if one is changing the magnifying power of a notional microscope viewing the system. In so-called renormalizable theories, the system at one scale will generally be seen to consist of self-similar copies of itself when viewed at a smaller scale, with different parameters describing the components of the system. The components, or fundamental variables, may relate to atoms, elementary particles, atomic spins, etc. The parameters of the theory typically describe the interactions of the components. These may be variable ""couplings"" which measure the strength of various forces, or mass parameters themselves. The components themselves may appear to be composed of more of the self-same components as one goes to shorter distances.For example, in quantum electrodynamics (QED), an electron appears to be composed of electrons, positrons (anti-electrons) and photons, as one views it at higher resolution, at very short distances. The electron at such short distances has a slightly different electric charge than does the ""dressed electron"" seen at large distances, and this change, or ""running,"" in the value of the electric charge is determined by the renormalization group equation.
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