Dimensional flow in the kappa-deformed space-time

TL;DR

This paper investigates how the spectral dimension of kappa-deformed space-time varies with scale by deriving modified diffusion equations and analyzing the effects of deformation, probe mass, and size on the dimensional flow.

Contribution

It introduces a method to derive and solve deformed diffusion equations in kappa-space-time, revealing the unbounded nature of spectral dimension at high energies and effects of probe properties.

Findings

Spectral dimension unbounded at high energies due to higher derivative terms.

Finite probe mass causes spectral dimension to diverge negatively at low energies.

Finite probe size influences the spectral dimension across scales.

Abstract

We derive the modified diffusion equations defined on kappa-space-time and using these, investigate the change in the spectral dimension of kappa-space-time with the probe scale. These deformed diffusion equations are derived by applying Wick's rotation to the $\kappa$-deformed Schr$\ddot{o}$dinger equations obtained from different choices of Klein-Gordon equations in the $\kappa$-deformed space-time. Using the solutions of these equations, obtained by perturbative method, we calculate the spectral dimension for different choices of the generalized Laplacian and analyse the dimensional flow in the $\kappa$-space-time. In the limit of commutative space-time, we recover the well known equality of spectral dimension and topological dimension. We show that the higher derivative term in the deformed diffusion equations make the spectral dimension unbounded (from below) at high energies. We show that the finite mass of the probe results in the spectral dimension to become infinitely negative at low energies also. In all the cases, we have analysed the effect of finite size of the probe on the spectral dimension.