physics

By Faraday's law, a changing magnetic flux through a loop produces electromotive force $\varepsilon=-\frac{\mathrm{d}\Phi}{\mathrm{d}t}$ . Suppose there is a rectangular loop in XY plane with Ohmic resistance $R$ and dimensions $a \times b$ moving at speed $v$ relative to an observer, in $x$ direction, in a uniform magnetic field $\vec{B}=b\vec{\hat{z}}$ . Magnetic flux through the a loop changes…

Scientists used Earth’s magnetic field and atmosphere as a planet-sized detector to search for some of the lightest proposed forms of dark matter. The approach dramatically improved limits on ultralight axions and uncovered several intriguing dark photon signals that still need to be explained.

According to this web article: http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/phase.html#c6 "In the process of heating water from 0 to 100 C, 100 calories of energy must be added. Part of that energy increases the kinetic energy of the molecules, and some adds to the potential energy." "The net gain in kinetic energy is then 16.7 calories/gram when the water is heated from 0 to 100 C. The rema…

The Autocremation Paradox (ACP) is a thought experiment designed to close the redundancy problem of the bootstrap paradox. Where standard loops persist an unchanged object or a piece of information without origin, the ACP lets the thermodynamic remainder of an event—the ashes of a cremation—function as the material cause (propellant) of that same event. The resulting State-Change Identity makes t…

Heisenberg said extreme magnetism would make nothingness bend light. A dead star just proved he was right.

Electrons, particles that carry a negative electric charge, typically move through materials. At low densities and temperatures, however, the electrical repulsion between them can overpower their tendency to move, prompting them to arrange themselves into ordered patterns known as Wigner crystals. In contrast with ordinary crystals, which consist of atoms arranged in a repeating pattern, […]

On the global structure and spacetime topology of Kerr-Newman-Reissner-Nordström spacetimes (and making explicit their 2-sphere topology): Brandon Carter: Global Structure of the Kerr Family of Gravitational Fields, Phys. Rev. 174 (1968) 1559 [doi:10.1103/PhysRev.174.1559] (including observation that the gyromagnetic ratio of the Kerr-Newman black hole is 2, just as the for electron cf. at anomal…