1,721,035 research outputs found
Boosted statistical mechanics
No full textBased on the fundamental principles of Relativistic Quantum Mechanics, we give a rigorous, but completely elementary, proof of the relation between fundamental observables of a statistical system when measured relatively to two inertial reference frames, connected by a Lorentz transformation
Identical particles, projectors and probabilities
No full textIn this Letter we reanalyze the old problem of the probability interpretation of the wave function in the case of identical particles. It is shown that, although the construction of observable single particle position (or momentum) operators is not easy nor natural, it is possible to bypass the problem through the construction of projectors that make probability computations completely systematic, easy to understand and adequate to the spirit of Quantum Mechanics. (C) 2009 Elsevier B.V. All rights reserved
A comparison between Abraham and Minkowski momenta
Full text linkIn this paper I compare the Abraham and the Minkowski forms for the momentum pertaining to an electromagnetic wave inside a dielectric or a magnetic material. The discussion is based on a careful treatment of the surface charges and currents and of the forces acting on them. While in the dielectric case the Abraham momentum is certainly more appealing from the physical point of view, for a magnetic material it suggests an interpretation in terms of magnetic charges and re- lated magnetic currents. The Minkowski momentum for magnetic non conducting materials, on the contrary, has a natural interpretation in terms of an amperian model, in which the dynamics is determined by the Lorentz force acting on bulk and surface electric currents
Heavy quark masses
Full text linkIn the large quark mass limit, an argument which identifies the mass of the heavy-light pseudoscalar or scalar bound state with the renormalized mass of the heavy quark is given. The following equation is discussed: m(sub Q) = m(sub B), where m(sub Q) and m(sub B) are respectively the mass of the heavy quark and the mass of the pseudoscalar bound state
The momentum of an electromagnetic wave inside a dielectric
No full textThe problem of assigning a momentum to an electromagnetic wave packet propagating inside an insulator has become known under the name of the Abraham-Minkowski controversy. In the present paper we re-examine this issue making the hypothesis that the forces exerted on an insulator by an electromagnetic field do not distinguish between polarization and free charges. Under this assumption we show that the Abraham expression for the radiation mechanical momentum is highly favored. (C) 2013 Elsevier Inc. All rights reserved
Exploring the Light-Cone through Semi-Inclusive Hadronic Distributions
No full textLight-cone dominance is established for a particular set of semi-inclusive observables in hadronic annihilation. This allows to deduce, with a certain degree of rigor, the angular distribution of hadronic energy from first principles, without invoking quark-hadron duality.Light-cone dominance is established for a particular set of semi-inclusive observables in hadronic annihilation. This allows to deduce, with a certain degree of rigor, the angular distribution of hadronic energy from first principles, without invoking quark-hadron duality
Some Observations on Broken Symmetries
No full textWe present a general analysis of the field theoretical properties which guarantee the recovery, at the renormalized level, of symmetries broken by regularization. We also discuss the anomalous case.We present a general analysis of the field theoretical properties which guarantee the recovery, at the renormalized level, of symmetries broken by regularization. We also discuss the anomalous case
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