Linger Thermo Theory: Simplifying the Finding of the Entropy of Mediums with Applications that Span from Astrophysics to Human Lifespan

A new, simple, method is revealed to yield the entropy of mediums such as a black-hole, a photon gas, and a flexible phase. These mediums span the scale of application from astrophysics to the derivation of lifespan bounds for organisms. The offered scheme surfaced through linger thermo theory (LTT), a novel, powerful, and emergent theory of thermal physics that integrates thermodynamics with its recently discovered time-dual named lingerdynamics. The origin of LTT can be traced to the Universal Cybernetics Duality Principle (UCDP), discovered in the late 1970s in Kalman Linear Quadratic Gaussian (LQG) 'continuous' control, with its first application being Matched Processors, a practical parallel processing methodology for 'quantized' control whose development was also motivated by biofeedback research on neural networks computational strategies. Although UCDP based entropies for the aforementioned mediums are now available, a simple scheme guiding as well as enlightening their derivation via the novel LTT has not yet been offered. The revelation of this scheme, a medium degrees of freedom (DoF) dependent one, is studied here. In a cybernetics application, the method is found to simplify the finding of the entropy of a flexible phase water medium, leading to theoretical lifespan bounds for humans that sensibly support the Harman free radical theory of aging. The offered scheme relates in one simple equation four basic physical quantities of a homogenous medium. They are: 1) its entropy, 2) its total mass-energy, 3) its temperature, and 4) its DoF number.