With the

Any charged particle moving faster than light through a medium emits Cherenkov radiation. We show that charged particles moving faster than light through the vacuum emit Cherenkov radiation. How can a particle move faster than light? The weak speed of a charged particle can exceed the speed of light. By definition, the weak velocity v w is Ψ f in |v|Ψ in /Ψ f in |Ψ in , where v is the velocity ...

The present paper can be considered as a natural extension the article [Ar7]. Fix root data (Y,X, . . . ) of the finite type (I, ·) and a positive integer number l. In [Ar7] we obtained a nice description for semiinfinite cohomology of the trivial module C over the small quantum group ul corresponding to the root data (Y,X, . . . ) in terms of local cohomology of the structure sheaf on the nilp...

The linear σ model with broken U3×U3 is compared with data on the lightest scalar and pseudoscalar mesons. When 5 of the 6 parameters are fixed by the pseudoscalar masses and decay constants one finds that, already at the tree level, a reasonable description for the 4 scalar masses, mixing and up to 8 trilinear couplings of lightest scalars, taken as a0(980), f0(980), σ(≈ 500) and K 0 (1430). T...

This paper discusses a system for automatic clustering of urban-legend texts. Urban legend (UL) is a short story set in the present day, believed by its tellers to be true and spreading spontaneously from person to person. A corpus of Polish UL texts was collected from message boards and blogs. Each text was manually assigned to one story type. The aim of the presented system is to reconstruct ...

In this paper, we investigate unmanned aerial vehicle (UAV) assisted communication systems that require quasi-balanced data rates in uplink (UL) and downlink (DL), as well users’ heterogeneous traffic. To the best of our knowledge, is first work to explicitly joint UL-DL optimization for UAV under requirements. A hybrid-mode multiple access (HMMA) scheme proposed toward traffic, where non-ortho...

X iv :h ep -p h/ 94 07 25 5v 1 8 J ul 1 99 4 UWThPh-1994-25 AUE-04-94 February 1, 2008 Maximal CP violation in the Higgs Sector and its Effect on the ρ Parameter Girish C. JOSHI 1 Masahisa MATSUDA 2 and Morimitsu TANIMOTO 3 (a) Department of Physics, University of Melbourne Parkville, Victoria 3052, AUSTRALIA (b) Department of Physics and Astronomy, Aichi University of Education Kariya, Aichi 4...

Let S be a subring of the ring R. We investigate the question of whether S ∩ U(R) = U(S) holds for the units. In many situations our answer is positive. There is a special emphasis on the case when R is a full matrix ring and S is a structural subring of R defined by a reflexive and transitive relation.

This paper is a review of recent and classical results on integrable geodesic flows on Riemannian manifolds and topological obstructions to integrability. We also discuss some open problems.