Title data
Scherer, Michael A. ; Ahlers, Guenter ; Hörner, Frank ; Rehberg, Ingo:
Deviations from Linear Theory for Fluctuations below the Supercritical Primary Bifurcation to Electroconvection.
In: Physical Review Letters.
Vol. 85
(October 2000)
Issue 18
.
- pp. 3754-3757.
ISSN 1079-7114
DOI der Verlagsversion: https://doi.org/10.1103/PhysRevLett.85.3754
Abstract
Over two decades ago it was predicted that nonlinear interactions between thermally driven fluctuations in dissipative nonlinear nonequilibrium systems lead to deviations from mean-field theory. Here we report experimental observations of such deviations as a supercritical primary bifurcation is approached. We measured the mean-square director-angle fluctuations ‹θ²› below the bifurcation to electroconvection of two different nematic liquid crystals. For ε{mf}≡V²/V{c,mf}² - 1 ≲ - 0.1 (V is the applied voltage) we find ‹θ²› α|ε{mf}|⁻γ with γ given by linear theory (LT). Closer to the bifurcation there are deviations from LT with a smaller γ and with V² > V{c,mf}².
Further data
Item Type: | Article in a journal |
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Additional notes (visible to public): | Quelle der Zweitveröffentlichung: Physical Review Letters 85:18, American Physical Society doi:10.1103/PhysRevLett.85.3754 |
Keywords: | Critical point phenomena; Fluctuation phenomena, random processes, noise, and Brownian motion; Pattern formation; Equilibrium properties near critical points, critical exponents |
DDC Subjects: | 500 Science > 530 Physics |
Institutions of the University: | Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors > Chair Experimental Physics V - Univ.-Prof. Dr. Ingo Rehberg Profile Fields > Advanced Fields > Nonlinear Dynamics Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics V Profile Fields Profile Fields > Advanced Fields Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors |
Language: | English |
Originates at UBT: | No |
URN: | urn:nbn:de:bvb:703-epub-4034-1 |
Date Deposited: | 22 Feb 2019 10:15 |
Last Modified: | 06 Jul 2020 10:45 |
URI: | https://epub.uni-bayreuth.de/id/eprint/4034 |