ترغب بنشر مسار تعليمي؟ اضغط هنا

Is G a conversion factor or a fundamental unit?

111   0   0.0 ( 0 )
 نشر من قبل Okun Lev Borisovich
 تاريخ النشر 2001
  مجال البحث فيزياء
والبحث باللغة English




اسأل ChatGPT حول البحث

By using fundamental units c, h, G as conversion factors one can easily transform the dimensions of all observables. In particular one can make them all ``geometrical, or dimensionless. However this has no impact on the fact that there are three fundamental units, G being one of them. Only experiment can tell us whether G is basically fundamental.



قيم البحث

اقرأ أيضاً

The accurate modeling of the dielectric properties of water is crucial for many applications in physics, computational chemistry and molecular biology. This becomes possible in the framework of nonlocal electrostatics, for which we propose a novel fo rmulation allowing for numerical solutions for the nontrivial molecular geometries arising in the applications mentioned before. Our approach is based on the introduction of a secondary field, $psi$, which acts as the potential for the rotation free part of the dielectric displacement field ${bf D}$. For many relevant models, the dielectric function of the medium can be expressed as the Greens function of a local differential operator. In this case, the resulting coupled Poisson (-Boltzmann) equations for $psi$ and the electrostatic potential $phi$ reduce to a system of coupled PDEs. The approach is illustrated by its application to simple geometries.
160 - A. M. Stewart 2014
A unified account, from a pedagogical perspective, is given of the longitudinal and transverse projective delta functions proposed by Belinfante and of their relation to the Helmholtz theorem for the decomposition of a three-vector field into its lon gitudinal and transverse components. It is argued that the results are applicable to fields that are time-dependent as well as fields that are time-independent.
184 - Hisakazu Minakata 2021
In a previous paper, the author proposed Symmetry Finder (SF) method for hunting symmetries in neutrino oscillation in matter, which essentially identifies a symmetry in the diagonalized Hamiltonian in matter. It was successfully applied to Denton {i t et al.} (DMP) perturbation theory to identify the eight 1-2 state exchange symmetries. In this paper, we apply the SF method to the atmospheric-resonance perturbation theory and uncover the sixteen 1-3 state exchange symmetries. Meanwhile, an alternative method for finding symmetry has been discussed. If a symmetry in the vacuum part of the Hamiltonian is found, it can be regarded as the symmetry of the total Hamiltonian because the matter term is invariant, the vacuum symmetry (VS) approach. We discuss the relationship between these two methods. One of the key questions is whether the VS method can reproduce the symmetries obtained by the SF method, to which several counter arguments are presented. Moreover, we argue that the newly found 1-3 state exchange symmetries add even more difficulties. The way how the VS method could make the goal are discussed.
We study quantum interference effects of a qubit whose energy levels are continuously modulated. The qubit is formed by an impurity electron spin in a silicon tunneling field-effect transistor, and it is read out by spin blockade in a double-dot conf iguration. The qubit energy levels are modulated via its gate-voltage-dependent g-factors, with either rectangular, sinusoidal, or ramp radio-frequency waves. The energy-modulated qubit is probed by the electron spin resonance. Our results demonstrate the potential of spin qubit interferometry implemented in a silicon device and operated at a relatively high temperature.
We theoretically demonstrate that electromagnetic energy can be obtained by direct, lossless, conversion from gravitational and kinetic energies. For this purpose we discuss the properties of an electromechanical system which consists of a supercondu cting coil submitted to a constant external force and to magnetic fields. The coil oscillates and has induced in it a rectified electrical current whose magnitude may reach hundreds of Ampere. There is no need for an external electrical power source for the system to start out and it can be kept working continuously if linked to large capacitors. We extensively discuss the issue of energy dissipation in superconductors and show that the losses for such a system can be made extremely small for certain operational conditions, so that by reaching and keeping resonance the system main application should be in magnetic energy storage and transmission.
التعليقات
جاري جلب التعليقات جاري جلب التعليقات
سجل دخول لتتمكن من متابعة معايير البحث التي قمت باختيارها
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا