Prof Ramin Golestanian: Publications

A dynamical test of special relativity using the anomalous electron g-factor

Physics Letters Section A General Atomic and Solid State Physics 231:5-6 (1997) 315-318

Authors:

M Kohandel, R Golestanian, MRH Khajehpour

Abstract:

Using the geometrical structure found for rival theories of space-time, a dynamical test for the special theory of relativity is introduced in terms of the anomalous electron g-factor. The corresponding experimental measurements verify the validity of special relativity almost an order of magnitude more accurate than the best kinematical tests. © 1997 Elsevier Science B.V.

Statistical mechanics of double-stranded semi-flexible polymers

ArXiv cond-mat/9705090 (1997)

Authors:

TB Liverpool, R Golestanian, K Kremer

Abstract:

We study the statistical mechanics of double-stranded semi-flexible polymers using both analytical techniques and simulation. We find a transition at some finite temperature, from a type of short range order to a fundamentally different sort of short range order. In the high temperature regime, the 2-point correlation functions of the object are identical to worm-like chains, while in the low temperature regime they are different due to a twist structure. In the low temperature phase, the polymers develop a kink-rod structure which could clarify some recent puzzling experiments on actin.

The Mechanical Response of Vacuum

ArXiv quant-ph/9701005 (1997)

Authors:

Ramin Golestanian, Mehran Kardar

Abstract:

A path integral formulation is developed for the dynamic Casimir effect. It allows us to study arbitrary deformations in space and time of the perfectly reflecting (conducting) boundaries of a cavity. The mechanical response of the intervening vacuum is calculated to linear order in the frequency-wavevector plane. For a single corrugated plate we find a correction to mass at low frequencies, and an effective shear viscosity at high frequencies; both anisotropic. For two plates there is resonant dissipation for all frequencies greater than the lowest optical mode of the cavity.

Fluctuation-induced interactions between rods on a membrane.

Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 54:6 (1996) 6725-6734

Authors:

R Golestanian, M Goulian, M Kardar

Reduced Persistence Length and Fluctuation-Induced Interactions of Directed Semiflexible Polymers on Fluctuating surfaces

ArXiv cond-mat/9603069 (1996)

Abstract:

We consider directed semiflexible polymers embedded in a fluctuating surface which is governed by either surface tension or bending rigidity. The attractive interactions induced by the fluctuations of the surface reduce the rigidity of the polymers. In particular, it is shown that for arbitrarily stiff parallel polymers, there is a characteristic separation below which they prefer to bend rather than stay linear. The out-of plane fluctuations of the polymer, screen out the long-range fluctuation-induced forces, resulting in only a short-ranged effective attraction.

91̽��