A numerical solution to the equations of motion for the ekpyrotic bulk brane scenario in the moduli space approximation is presented. The visible universe brane has positive tension, and we use a potential that goes to zero exponentially at large distance, and also goes to zero at small distance. In the case considered, no bulk brane, visible brane collision occurs in the solution. This propert...

In this work we consider a scenario where the dark energy is dynamical fluid whose density can be transferred to matter via coupling function proportional of energy. particular, investigate model’s ability address S8 tension and find that against data from Planck, BAO Pantheon model (1) significantly reduce significance tension, (2) does so without exacerbating nor introducing any other (such a...

The mechanosensitive channel of small conductance (MscS) is a bacterial tension-driven osmolyte release valve with homologues in many walled eukaryotic organisms. When stimulated by steps of tension in excised patches, Escherichia coli MscS exhibits transient opening followed by reversible adaptation and then complete inactivation. Here, we study properties of the inactivation transition, which...

We discuss the weak gravitational field created by isolated matter sources in the Randall-Sundrum brane world. For the case of a single wall of positive tension, the field stays localized near the wall if the source is stationary. We calculate the leading Kaluza-Klein corrections to the linearized gravitational field of a nonrelativistic spherical object, which is different from the Schwarzschi...

Zhelev and Needham have recently created large, quasistable pores in artificial lipid bilayer vesicles. Initially created by electroporation, the pores remain open for up to several seconds before quickly snapping shut. This result is surprising, in light of the large line tension for holes in bilayer membranes and the rapid time scale for closure of large pores. We show how pores can be dynami...

In this paper, a nonlinear discrete-time model that simulates a vibrating string exhibiting tension modulation nonlinearity is developed. The tension modulation phenomenon is caused by string elongation during transversal vibration. Fundamental frequency variation and coupling of harmonic modes are among the perceptually most important effects of this nonlinearity. The proposed model extends th...

cell ghosts (Steck et. al., Science 168:255(1970)). Lipid membranes, the sheets which form the boundaries of cells, must maintain their integrity for cells to live [1]. Since a tear in a membrane exposes the hydrophobic interior of the sheet to water, tradition maintains that membranes have a high line tension (energy per unit length of exposed edge) and never spontaneously form holes. We show ...

Eight molecular dynamics simulations of a hydrated lipid bilayer have been carried out differing only in the applied surface tension, g, defining the boundary conditions of the periodic cell. The calculated surface area per molecule and deuterium order parameter profile are found to depend strongly on g. We present several methods to calculate the area compressibility modulus, KA , from the sim...

This paper describes a simple and efficient non-stationary subdivision scheme of order 4. This curve scheme unifies known subdivision rules for cubic B-splines, splines-in-tension and a certain class of trigonometric splines capable of reproducing circles. The curves generated by this unified subdivision scheme are C2 splines whose segments are either polynomial, hyperbolic or trigonometric fun...