Zobrazeno 1 - 10
of 318
pro vyhledávání: '"Galgani L"'
It is well known that the optical branches of the dispersion curves of ionic crystals exhibit a polaritonic feature, i.e., a splitting about the electromagnetic dispersion line $\omega=ck$. This phenomenon is considered to be due to the retardation o
Externí odkaz:
http://arxiv.org/abs/1312.0893
We show how statistical thermodynamics can be formulated in situations in which thermodynamics applies, while equilibrium statistical mechanics does not. A typical case is, in the words of Landau and Lifshitz, that of partial (or incomplete) equilibr
Externí odkaz:
http://arxiv.org/abs/1304.4113
It is known that a plasma in a magnetic field, conceived microscopically as a system of point charges, can exist in a magnetized state, and thus remain confined, inasmuch as it is in an ordered state of motion, with the charged particles performing g
Externí odkaz:
http://arxiv.org/abs/1202.3978
A crucial problem concerning a large variety of fusion devices is that the confinement due to an external magnetic field is lost above a critical density, while a widely accepted first principles explanation of such a fact is apparently lacking. In t
Externí odkaz:
http://arxiv.org/abs/1112.1030
We study a classical model of Helium atom in which, in addition to the Coulomb forces, the radiation reaction forces are taken into account. This modification brings in the model a new qualitative feature of a global character. Indeed, as pointed out
Externí odkaz:
http://arxiv.org/abs/1111.5794
In the present paper the problem of the relaxation of magnetization to equilibrium (i.e., with no magnetization) is investigated numerically for a variant of the well-known model introduced by Bohr to study the diamagnetism of electrons in metals. Su
Externí odkaz:
http://arxiv.org/abs/1009.4861
We show that in a neutral magnetized plasma there exist microscopic oscillatory modes, with wavelengths of the order of magnitude of the mean interparticle distance, which become unstable when the electron density exceeds a limit proportional to the
Externí odkaz:
http://arxiv.org/abs/1005.0795
Fusion research on magnetic confinement is confronted with a severe problem concerning the electron densities ne to be used in fusion devices. Indeed, high densities are mandatory for obtaining large efficiencies, whereas it is empirically found that
Externí odkaz:
http://arxiv.org/abs/1001.4480
Publikováno v:
Europhys.Lett.83:59002,2008
We show that in cosmology the gravitational action of the far away matter has quite relevant effects, if retardation of the forces and discreteness of matter (with its spatial correlation) are taken into account. The expansion rate is found to be det
Externí odkaz:
http://arxiv.org/abs/0903.1355
We give an estimate of the gravitational field of force exerted on a test particle by the far galaxies, in the frame of the weak field approximation. In virtue of Hubble's law, the action of the far matter turns out to be non negligible, and even the
Externí odkaz:
http://arxiv.org/abs/0712.0547