Fluctuation spectrum

Fluctuation spectra[1][2] are commonly denoted by sets of physical phenomena such as hydrodynamic turbulence, the collective behaviour of bacteria and more generally fluctuations originating from the equilibrium state. All of these phenomena can be generalised by a few theoretical results that qualitatively describe these non-equilibrium steady states. A common example of this is the derivation of the force exerted by a non-equilibrium system on two embedded walls. It is characteristic of a narrow, unimodal spectrum for the force to be dependent on the width and peak within a fluctuation spectrum, which oscillates between repulsion and attraction.

Some common generalisations of this theory can be applied to the Maritime Casimir Effect and through the motion of active Brownian particles[3] within a closed system. Examples of active non-equilibrium systems can be demonstrated through many chemical, physical and biological processes; which range from turbulence, mechanical driving, chemical bonding, chemical gradients and cosmic background radiation.

References
  1. Paxton, Walter F.; Kistler, Kevin C.; Olmeda, Christine C.; Sen, Ayusman; St. Angelo, Sarah K.; et al. (2004). "Catalytic Nanomotors: Autonomous Movement of Striped Nanorods". Journal of the American Chemical Society. American Chemical Society (ACS). 126 (41): 13424–13431. doi:10.1021/ja047697z. ISSN 0002-7863.
  2. Soto, Rodrigo; Golestanian, Ramin (2014-02-10). "Self-Assembly of Catalytically Active Colloidal Molecules: Tailoring Activity Through Surface Chemistry". Physical Review Letters. American Physical Society (APS). 112 (6): 068301. arXiv:1306.6596. doi:10.1103/physrevlett.112.068301. ISSN 0031-9007.
  3. Brandt, Erik G.; Braun, Anthony R.; Sachs, Jonathan N.; Nagle, John F.; Edholm, Olle (2011-05-04). "Interpretation of Fluctuation Spectra in Lipid Bilayer Simulations". Biophysical Journal. 100 (9): 2104–2111. Bibcode:2011BpJ...100.2104B. doi:10.1016/j.bpj.2011.03.010. ISSN 0006-3495. PMC 3149257. PMID 21539777.


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