Extrinsic and intrinsic effects setting viscosity in complex fluids and life processes: the role of fundamental physical constants

Abstract

Understanding the values and origin of fundamental physical constants, one of the grandest challenges in modern science, has been discussed in particle physics, astronomy and cosmology. More recently, it was realised that fundamental constants have a bio-friendly window set by life processes involving motion and flow. This window is related to intrinsic fluid properties such as energy and length scales in condensed matter set by fundamental constants. Here, we discuss important extrinsic factors governing the viscosity of complex fluids operating in life processes due to collective effects. We show that both extrinsic and intrinsic factors affecting viscosity need to be taken into account when estimating the bio-friendly range of fundamental constants from life processes, and our discussion provides a straightforward recipe for doing this. We also find that the relative role of extrinsic and intrinsic factors depends on the range of variability of these intrinsic and extrinsic factors. Remarkably, the viscosity of a complex fluid such as blood with significant extrinsic effects is not far from the intrinsic viscosity calculated using the fundamental constants only, and we discuss the reason for this in terms of dynamics of contact points between cells.

arXiv admin note: text overlap with arXiv:2307.05273

References in corpus (13)

• The fundamental constants and their variation: observational status and theoretical motivations
• Varying constants, Gravitation and Cosmology
• Collective modes and thermodynamics of the liquid state
• Why the Universe is Just So
• Theory of activated-rate processes under shear with application to shear-induced aggregation of colloids
• Breakup of dense colloidal aggregates under hydrodynamic stresses
• Minimal quantum viscosity from fundamental physical constants
• Mesoscale modeling of near-contact interactions for complex flowing interfaces
• The Degree of Fine-Tuning in our Universe -- and Others
• Modelling of liquid internal energy and heat capacity over a wide pressure-temperature range from first principles
• The Purcell question: why do all viscosities stop at the same place?
• General theory of the viscosity of liquids and solids from nonaffine particle motions
• Constraints on fundamental physical constants from bio-friendly viscosity and diffusion