Category Archives: Thermodynamics
Analogy between thermal emission of nano objects and Hawking’s radiation
Karl Joulain
We analyze in this work some analogies between thermal emission of nano objects and Hawking’s radiation. We first focus on the famous expression of the black hole radiating temperature derived by Hawking in 1974 and consider the case of thermal emission of a small aperture made into a cavity (Ideal Blackbody). We show that an expression very similar to Hawking’s temperature determines a temperature below which an aperture in a cavity cannot be considered as standard blackbody radiating like T^4. Hawking’s radiation therefore appear as a radiation at a typical wavelength which is of the size of the horizon radius. In a second part, we make the analogy between the emission of particle-anti particle pairs near the black hole horizon and the scattering and coupling of thermally populated evanescent waves by a nano objects. We show here again that a temperature similar to the Hawking temperature determines the regimes where the scattering occur or where it is negligible.
Read more at https://arxiv.org/pdf/1808.08037.pdf
Thermodynamics of Machine Learning
Alexander A. Alemi, Ian Fischer
In this work we offer a framework for reasoning about a wide class of existing objectives in machine learning. We develop a formal correspondence between this work and thermodynamics and discuss its implications.
Read more at https://arxiv.org/pdf/1807.04162.pdf
Second Law of Thermodynamics
Professor Mike Merrifield discusses aspects of the Second Law of Thermodynamics. Referencing the work of Kelvin and Clausius, among others!
Professor Merrifield is the Head of the School of Physics and Astronomy at the University of Nottingham.
Do we know what the temperature is?
Jiri J. Mares
Temperature, the central concept of thermal physics, is one of the most frequently employed physical quantities in common practice. Even though the operative methods of the temperature measurement are described in detail in various practical instructions and textbooks, the rigorous treatment of this concept is almost lacking in the current literature. As a result, the answer to a simple question of “what the temperature is” is by no means trivial and unambiguous. There is especially an appreciable gap between the temperature as introduced in the frame of statistical theory and the only experimentally observable quantity related to this concept, phenomenological temperature. Just the logical and epistemological analysis of the present concept of phenomenological temperature is the kernel of the contribution.
Read more at https://arxiv.org/ftp/arxiv/papers/1604/1604.05563.pdf
