https://doi.org/10.1140/epjc/s10052-022-10813-z
Regular Article - Theoretical Physics
Fractal properties of particle paths due to generalised uncertainty relations
1
National Astronomical Research Institute of Thailand, 260 Moo 4, T. Donkaew, A. Maerim, 50180, Chiang Mai, Thailand
2
Department of Physics, Faculty of Science, Chiang Mai University, 239 Huaykaew Road, T. Suthep, A. Muang, 50200, Chiang Mai, Thailand
3
School of Physics, Sun Yat-Sen University, 510275, Guangzhou, China
4
Department of Physics, Babeş-Bolyai University, Mihail Kogălniceanu Street 1, 400084, Cluj-Napoca, Transylvania, Romania
Received:
2
June
2022
Accepted:
15
September
2022
Published online:
19
October
2022
We determine the Hausdorff dimension of a particle path, 
, in the recently proposed ‘smeared space’ model of quantum geometry. The model introduces additional degrees of freedom to describe the quantum state of the background and gives rise to both the generalised uncertainty principle (GUP) and extended uncertainty principle (EUP) without introducing modified commutation relations. We compare our results to previous studies of the Hausdorff dimension in GUP models based on modified commutators and show that the minimum length enters the relevant formulae in a different way. We then determine the Hausdorff dimension of the particle path in smeared momentum space, 
, and show that the minimum momentum is dual to the minimum length. For sufficiently coarse grained paths, 
, as in canonical quantum mechanics. However, as the resolutions approach the minimum scales, the dimensions of the paths in each representation differ, in contrast to their counterparts in the canonical theory. The GUP-induced corrections increase whereas the EUP-induced corrections decrease , relative to their canonical values, and the extremal case corresponds to 
, 
. These results show that the GUP and the EUP affect the fractal properties of the particle path in fundamentally different, yet complimentary, ways.
© The Author(s) 2022
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