Thermal Radiation & Energy Transport

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Abstractions about heat conduction, radiation, emission, thermoelectric and photovoltaic conversion, energy currents, and relativistic or emergent thermal effects.

15 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Ehrenfest–Tolman effect — The general-relativistic equilibrium condition that locally measured temperature varies with gravitational redshift so temperature times the norm of the stationary timelike Killing field is constant.
• Energy current — A flow representation for the rate and direction of energy transfer through space or across a boundary.
• Entropic gravity — The hypothesis that gravitational dynamics emerge as an entropic or information-theoretic force rather than a fundamental interaction.
• Heat release parameter — A dimensionless combustion parameter comparing adiabatic temperature rise with unburned-mixture temperature.
• Joule expansion — An irreversible free expansion in which a gas initially confined in an insulated rigid vessel expands into an evacuated region after a partition is removed.
• Pyroelectricity — The change in spontaneous electric polarization and resulting surface charge produced by a change in a material’s temperature.
• Relativistic heat conduction — A family of continuum models for thermal transport whose signals remain causal and stable within relativistic light cones.
• Schwarzschild's equation for radiative transfer — The differential balance of absorption and thermal emission for spectral radiation traveling through a nonscattering medium in local thermodynamic equilibrium.
• Second sound — Wave-like propagation of temperature or entropy disturbances in a material where heat transport becomes hydrodynamic rather than diffusive.
• Secondary emission — The release of additional particles, usually electrons, from a material after energetic primary particles or radiation deposit energy at or near its surface.
• Semilinear response — A mesoscopic response framework in which energy absorption depends on the connected percolation of driven transitions through a sparse network in energy space rather than on their simple arithmetic average.
• Theory of solar cells — The semiconductor-physics framework explaining how absorbed photons generate, separate and collect charge carriers as electrical power in a photovoltaic device.
• Thermal emittance — The ratio of thermal radiant flux emitted by a particular surface to that emitted by a blackbody at the same temperature under specified spectral and directional conditions.
• Thermophotovoltaic energy conversion — Direct conversion of thermal radiation from a hot emitter into electricity using photovoltaic cells spectrally matched to the emitter.
• Thouless energy — The characteristic energy scale equal to reduced Planck’s constant divided by the diffusion time across a disordered mesoscopic sample.