نتایج جستجو برای: angular momentum
تعداد نتایج: 113432 فیلتر نتایج به سال:
Angular-momentum variables represent basic observables both in classical and quantum optics, specially in three fundamental areas: polarization, interferometry and light-matter interaction [1–10]. For definiteness, throughout we focus on intrinsic (not orbital) angular momenta. This is for example the case of the Stokes parameters, which provide a complete account of secondorder (in complex amp...
We present a quantum Monte Carlo method with exact projection on parity and angular momentum that is free of sign-problems for seniority-conserving nuclear interactions. This technique allows a microscopic calculation of angular momentum and parity projected nuclear level densities. We present results for the 55Fe, 56Fe and 57Fe isotopes. Signatures of the pairing phase transition are observed ...
We investigate the nonlinear dynamics of two coupled annular Bose-Einstein condensates (BECs). For certain values of the coupling strength the nonrotating state with uniform density is unstable with respect to fluctuations in the higher angular momentum modes. The Bogoliubov spectrum possesses two branches, one of which exhibits distinct regions of instability enabling one to selectively occupy...
Chirality is exhibited by objects that cannot be rotated into their mirror images. It is far from obvious that this has anything to do with the angular momentum of light, which owes its existence to rotational symmetries. There is nevertheless a subtle connection between chirality and the angular momentum of light. We demonstrate this connection and, in particular, its significance in the conte...
The population of metastable states produced in relativistic-energy fragmentation of a 238U beam has been measured. For states with high angular momentum, I=17h̄ and I=21.5h̄, a higher population than expected has been observed, with the discrepancy increasing with angular momentum. By considering two sources for the angular momentum, related to single-particle and collective motions, a much impr...
In recent yeam much aaention has been paid to the quantized evolution of the centreof-mass momentum and position of ultracold atoms in light fields. We consider the effects resulting from the quantization of the extemal angular momentum variables. We investigate how spin and orbital angular momentum of light are transferred to internal and extemal angular momenhlm of an atom in dipole and quadr...
Star-disk interaction is thought to drive the angular momentum evolution of young stars. In this review, I present the latest results obtained on the rotational properties of low mass and very low mass pre-main sequence stars. I discuss the evidence for extremely efficient angular momentum removal over the first few Myr of pre-main sequence evolution and describe recent results that support an ...
The quantum theory of rotation angles (S. M. Barnett and D. T. Pegg, Phys. Rev. A, 41, 3427-3425 (1990)) is generalised to noninteger values of the orbital angular momentum. This requires the introduction of an additional parameter, the orientation of a phase discontinuity associated with fractional values of the orbital angular momentum. We apply our formalism to the propagation of light modes...
We carry out the Hamiltonian formulation of the three-dimensional gravitational teleparallelism without imposing the time gauge condition, by rigorously performing the Legendre transform. Definition of the gravitational angular momentum arises by suitably interpreting the integral form of the constraint equation Γik = 0 as an angular momentum equation. The gravitational angular momentum is eval...
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