LeidenForceMatter for Thought - Timeless insights for Modern Physics
đšâđŹQuote by John Tyndall, Irish physicist
đSource: "Heat as a Mode of Motion" (1874)
#Physics #NatureConnections #ScientificQuotes #Thermodynamics #SciencePhilosophy
PhilipHeat pumps refrigerate the outside.
Paul Balduf#PaperOfTheDay is "Full phase diagram of the massive Gross-Neveu model" from 2006.
The Gross-Neveu model is a #quantumFieldTheory of fermions in two spacetime dimensions. In the absence of a bare mass term, it has a discrete chiral symmetry (a few days ago I shared a paper where that symmetry is promoted to a continuous symmetry by adding a second interaction term). The present paper, conversely, is about the case where the mass is non-zero. Then, chiral symmetry is broken.
They consider the theory from a #thermodynamics perspective, where the variables are temperature (i.e. the Planck constant in quantum field language), chemical potential (i.e. a constant offset to energy), and the mass of the particle. Using a clever ansatz, they are able to compute the full phase diagram of the Gross-Neveu field as function of the three variables. As had long been known, if the bare mass vanishes, then the model generates a dynamic mass for the fermion at low enough temperature and chemical potential. It had previously been believed that at non-vanishing bare mass, there would be a discontinuous change in the effective mass from large to small as the temperature is increased. The central result of the present paper is that this is false: Instead, in the boundary region, there is another phase where the field is spacially non-homogeneous, it forms a periodic crystal. Below, one has a heavy fermion, above the fermion is light, and the new phase is something different altogether.
https://www.sciencedirect.com/science/article/abs/pii/S0003491605002915
The Gross-Neveu model is a #quantumFieldTheory of fermions in two spacetime dimensions. In the absence of a bare mass term, it has a discrete chiral symmetry (a few days ago I shared a paper where that symmetry is promoted to a continuous symmetry by adding a second interaction term). The present paper, conversely, is about the case where the mass is non-zero. Then, chiral symmetry is broken.
They consider the theory from a #thermodynamics perspective, where the variables are temperature (i.e. the Planck constant in quantum field language), chemical potential (i.e. a constant offset to energy), and the mass of the particle. Using a clever ansatz, they are able to compute the full phase diagram of the Gross-Neveu field as function of the three variables. As had long been known, if the bare mass vanishes, then the model generates a dynamic mass for the fermion at low enough temperature and chemical potential. It had previously been believed that at non-vanishing bare mass, there would be a discontinuous change in the effective mass from large to small as the temperature is increased. The central result of the present paper is that this is false: Instead, in the boundary region, there is another phase where the field is spacially non-homogeneous, it forms a periodic crystal. Below, one has a heavy fermion, above the fermion is light, and the new phase is something different altogether.
https://www.sciencedirect.com/science/article/abs/pii/S0003491605002915
Nicolas MĂUARTI had flashback reading a research paper, I loved thermodynamics at Uni đ
"The radiant exitance (previously called radiant emittance), M {\displaystyle M}, has dimensions of energy flux (energy per unit time per unit area), and the SI units of measure are joules per second per square metre (Jâ
sâ1â
mâ2), or equivalently, watts per square metre (Wâ
mâ2).[2] The SI unit for absolute temperature, T, is the kelvin (K)"
#thermodynamics
Scientific FrontlineThermodynamics is the foundational branch of physical science concerned with the macroscopic relationships between heat, work, temperature, and energy. Its primary goal is to establish the fundamental laws that govern the transfer of energy from one place to another and from one form to another, as well as to determine the spontaneity and direction of physical and chemical processes.
#Thermodynamics #Physics #sflorg
https://www.sflorg.com/2026/04/cat04042601.html
#Thermodynamics #Physics #sflorg
https://www.sflorg.com/2026/04/cat04042601.html
Gregor Kos đšđŠđȘđș#Introduction I am Gregor Kos, a Senior Lecturer at #Concordia University in #Montreal, #Canada.
I teach #Thermodynamics, #AnalyticalChemistry, Introductory Research Methods and #MachineLearning for Chemists and Biochemists. I am working on hyper-local urban air quality using low-cost sensors.
#Présentation Gregor Kos, maßtre de conférences à l'Université Concordia de Montréal, au Canada.
J'enseigne la #thermodynamique, #chimieAnalytique, les méthodes de recherche et l'apprentissage automatique (machine learning) aux chimistes et aux biochimistes. Je mÚne des travaux de #recherche sur la #qualité de l'air en environnement urbain à l'échelle hyper-locale à l'aide de capteurs à faible coût.
Languages/langues: en/fr/de.
earthlingHow Clean Air Warms the Earth
Today, weâre exploring a microscopic landscape completely invisible to the naked eyeâa world of 'ghost' particles that control both our climate and our own biology.
#aerosol #TerminationShock #atmosphere #physics #thermodynamics #PublicHealth #ShippingEmissions #sulfur #FaustianBargain #WhiteDragon #çœéŸ #EarthCARE #podcasts #YouTube #GlobalWarming
How Clean Air Warms the Earth
Cooling is rarely steady. Experiments show how heat transfer changes dynamically during rapid temperature drops.
These transient effects matter for boiling regimes and could help refine models of vapor layer formation.
#heattransfer #phasechange #leidenfrosteffect #thermodynamics #physics
N-gated Hacker NewsOh, look! Another #academic trying to make #thermodynamics sound interesting by slapping on fancy words and #outdated #references. đđđŽ For those who enjoy #reading #verbose #papers about imaginary demons in their spare time, this oneâs for you. Otherwise, itâs just 650 words youâll never get back. đ€Šââïž
https://sites.pitt.edu/~jdnorton/Goodies/Idealization/index.html #humor #HackerNews #ngated
https://sites.pitt.edu/~jdnorton/Goodies/Idealization/index.html #humor #HackerNews #ngated
Hacker NewsThe Failure of the Thermodynamics of Computation(2010)
https://sites.pitt.edu/~jdnorton/Goodies/Idealization/index.html
#HackerNews #Thermodynamics #Computation #Failure #Idealization #Science #History