Overview
Living cells are defined as energy- and information-processing systems that maintain a non-equilibrium steady state (NESS) through continuous energy consumption and heat dissipation. The second law of thermodynamics mandates this heat dissipation. The rate at which heat is dissipated, known as the entropy production rate ($\sigma$), is characterized as a universal primal life signal and a distinctive descriptor of a cell's state.
Living matter typically dissipates approximately $P_{\mathrm{life}} \sim 1$ Watt/kilogram (W/kg). This value exhibits conservation across various biological scales, from molecular reactions to entire organisms. This power density is identified as $10^4$ times greater than that of the Sun. Comparatively, this $P_{\mathrm{life}}$ is similar to the universe's average power density, $P_U = c^2 H_0 \sim 1$ W/kg, where $c$ represents the speed of light and $H_0$ is the Hubble constant. This noted coincidence aligns with Dirac's large number hypothesis.
The hypothesis posits that this substantial $P_{\mathrm{life}}$ establishes the scale for negentropy generation. Negentropy is defined as the negative contribution to the overall positive $\sigma$ responsible for sustaining biological organization, thereby differentiating living from non-living matter.
Research Context
The concept of heatomics is introduced as the scientific discipline dedicated to investigating $\sigma$ at both cellular and molecular levels. This emerging field aims to clarify the fundamental principles underlying heat power generation, the optimization of energy resources, and the role of negentropy within living systems.
Approach
The research proposes the Variance Sum Rule as an experimental-theoretical framework. This framework is designed to extract $\sigma$ using fluctuations from a dynamical probe. The application of this rule is coupled with the equation of state relevant for a NESS.
Findings
- Living cells operate as energy- and information-processing systems in a non-equilibrium steady state.
- Continuous energy consumption and heat dissipation are fundamental processes for cellular existence, governed by the second law of thermodynamics.
- The entropy production rate ($\sigma$) functions as a universal primal life signal and uniquely describes cellular states.
- Living matter dissipates power at approximately $P_{\mathrm{life}} \sim 1$ W/kg, a value conserved from molecular reactions to organisms.
- This $P_{\mathrm{life}}$ is $10^4$ times larger than the Sun's power density and comparable to the universe's average power density, $P_U = c^2 H_0 \sim 1$ W/kg, consistent with Dirac's large number hypothesis.
- The large $P_{\mathrm{life}}$ is hypothesized to set the scale for negentropy generation, which supports biological organization and distinguishes animate from inanimate matter.
- Heatomics is introduced as a field for studying $\sigma$ at cellular and molecular scales.
- The Variance Sum Rule is presented as a framework to derive $\sigma$ from fluctuations of a dynamical probe in conjunction with the NESS equation of state.
Why This Matters
The proposed field of heatomics seeks to illuminate basic principles governing heat power generation, the efficient use of energy, and the creation of negentropy in biological entities. Understanding these aspects could provide insight into the core mechanisms that define and sustain life.