We investigate the well-known phenomenon of beam-plasma instability in gravitational sector, when a fast population particles interacts with massive scalar mode an Horndeski theory gravity, resulting into linear growth latter amplitude. Following approach used standard electromagnetic case, we start from dielectric representation plasma, as introduced previous analysis Landau damping for mode. ...

It is pointed out that models with condensates have nontrivial renormalization group flow on the tree level. The infinitesimal form of the tree level renormalization group equation is obtained and solved numerically for the φ4 model in the symmetry broken phase. We find an attractive infrared fixed ∗[email protected] †[email protected] ‡[email protected]

The sinuous instability of a viscous jet flowing down an inviscid fluid is studied. On the basis of the 3D Navier-Sokes equations for the jet the full dispersion equation of the small disturbances is derived. Numerical results are shown, illustrating both the effect of viscosity and ambient density.

Twoand three-dimensional numerical simulations are performed to study interfacial waves in a periodic domain by imposing a source term in the horizontal momentum equation. Removing the source term before breaking generates a stable interfacial wave. Continued forcing results in a two-dimensional shear instability for waves with thinner interfaces, and a convective instability for waves with thi...

in the present work, the effect of fluid’s elasticity was investigated on the hydrodynamic instability of blasius flow. to determine the critical reynolds number as a function of the elasticity number, a two-dimensional linear temporal stability analysis was invoked. the viscoelastic fluid is assumed to obey the walters’ b fluid model for which base flow velocity profiles were fortunately avail...

Close to the shielding threshold of synchrotron radiation in a toroidal waveguide the coherent synchrotron radiation (CSR) instability may be driven by a single synchronous mode. The linear analysis of the problem is presented elsewhere. In this paper we study a nonlinear regime of the single-mode CSR instability. We show that in the nonlinear regime the instability is described by a system of ...

The D2-D0 bound state exhibits a Gregory-Laflamme instability when it is sufficiently non-extremal. If there are no D0-branes, the requisite non-extremality is finite. When most of the extremal mass comes from D0-branes, the requisite non-extremality is very small. The location of the threshold for the instability is determined using a local thermodynamic analysis which is then checked against ...

background: this study was designed to determine the frequency of microsatellite instability (msi) in young iranian pa­tients with endometrial carcinoma and to evaluate its association with histopathologic and clinical features of disease. methods : microsatellite status was analyzed in 23 patients with endometrioid type endometrial cancer who were less than 55 years. clinicopathologic characte...

The economic situation in the Arab countries is due to several factors as the political crisis in a socio-economic vulnerability. Political changes are usually accompanied by a drop in production, a deterioration of macroeconomic balances, a high level of poverty, an appearance of economic corruptions and a structural increase in unemployment. In addition, the expansion of terrorism is a main i...