62 research outputs found
Asymmetry-Driven Structure Formation in Pair Plasmas
The nonlinear propagation of electromagnetic waves in pair plasmas, in which
the electrostatic potential plays a very important but subdominant role of a
"binding glue" is investigated. Several mechanisms for structure formation are
investigated, in particular, the "asymmetry" in the initial temperatures of the
constituent species. It is shown that the temperature asymmetry leads to a
(localizing) nonlinearity that is new and qualitatively different from the ones
originating in ambient mass or density difference. The temperature asymmetry
driven focusing-defocusing nonlinearity supports stable localized wave
structures in 1-3 dimensions, which, for certain parameters, may have flat-top
shapes.Comment: 23 pages, 6 figures, introduction revised, edited typos, accepted for
publication in Phys. Rev.
Vortex Bubble Formation in Pair Plasmas
It is shown that delocalized vortex solitons in relativistic pair plasmas
with small temperature asymmetries can be unstable for intermediate intensities
of the background electromagnetic field. Instability leads to the generation of
ever-expanding cavitating bubbles in which the electromagnetic fields are zero.
The existence of such electromagnetic bubbles is demonstrated by qualitative
arguments based on a hydrodynamic analogy, and by numerical solutions of the
appropriate Nonlinear Schr\"odinger equation with a saturating nonlinearity.Comment: 4 pages of two-column text, 2 figure
Peculiarities of Galactic Cosmic Ray (GCR) anisotropy variation in connection with the recurrent and sporadic Forbush effects
It has been established, that the beginning of the change of vector of Solar-diurnal anisotropy of Galactic Cosmic Rays (GCR) preceeds due to disturbed region (DR) of Solar wind existing time of which is Tau or = 8 days. The meridional gradient delta theta eta of density during the recurrent FD is valued
Generalized Conifolds and 4d N=1 SCFT
This paper lays groundwork for the detailed study of the non-trivial
renormalization group flow connecting supersymmetric fixed points in four
dimensions using string theory on AdS spaces. Specifically, we consider
D3-branes placed at singularities of Calabi-Yau threefolds which generalize the
conifold singularity and have an ADE classification. The
superconformal theories dictating their low-energy dynamics are infrared fixed
points arising from deforming the corresponding ADE
superconformal field theories by mass terms for adjoint chiral fields. We probe
the geometry with a single -brane and discuss the near-horizon supergravity
solution for a large number of coincident -branes.Comment: harvmac 27pp; v2. refs added, typos corrected, abstract renormalized,
v3. more of that sort, version to appear in JHE
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