arXiv subjects

Sz. Farkas

Publications and source records attributed to Sz. Farkas.

2 recordsLinked to original sources

arXiv2004

Edwards-Wilkinson surface over a spherical substrate: $1/f$ noise in the height fluctuations

We study the steady state fluctuations of an Edwards-Wilkinson type surface with the substrate taken to be a sphere. We show that the height fluctuations on circles at a given latitude has the effective action of a perfect Gaussian $1/f$ noise, just as in the case of fixed radius circles on an infinite planar substrate. The effective surface tension, which is the overall coefficient of the action, does not depend on the latitude angle of the circles.

cond-mat.stat-mech↗

arXiv2000

Poincaré covariance of relativistic quantum position

A great number of problems of relativistic position in quantum mechanics are due to the use of coordinates which are not inherent objects of spacetime, cause unnecessary complications and can lead to misconceptions. We apply a coordinate-free approach to rule out such problems. Thus it will be clear, for example, that the Lorentz covariance of position, required usually on the analogy of Lorentz covariance of spacetime coordinates, is not well posed and we show that in a right setting the Newton--Wigner position is Poincaré covariant, in contradiction with the usual assertions.

quant-ph↗