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In theoretical physics, quantum field theory in curved spacetime (QFTCS) [1] is an extension of quantum field theory from Minkowski spacetime to a general curved spacetime. This theory uses a semi-classical approach; it treats spacetime as a fixed, classical background, while giving a quantum-mechanical description of the matter and energy ...
In general relativity, Synge's world function is a smooth locally defined function of pairs of points in a smooth spacetime with smooth Lorentzian metric.Let , ′ be two points in spacetime, and suppose belongs to a convex normal neighborhood of , ′ (referred to the Levi-Civita connection associated to ) so that there exists a unique geodesic from to ′ included in , up to the affine ...
The Mikheyev–Smirnov–Wolfenstein effect (often referred to as the matter effect) is a particle physics process which modifies neutrino oscillations in matter of varying density. The MSW effect is broadly analogous to the differential retardation of sound waves in density-variable media, however it also involves the propagation dynamics of ...
The field equations of condensed matter physics are remarkably similar to those of high energy particle physics. As a result, much of the theory of particle physics applies to condensed matter physics as well; in particular, there are a selection of field excitations, called quasi-particles, that can be created and explored. These include:
D: Absorbed dose received per unit of time Gy/s L 2 T −3: Action: S: Momentum of particle multiplied by distance travelled J/Hz L 2 M T −1: scalar Angular acceleration: ω a: Change in angular velocity per unit time rad/s 2: T −2: Area: A: Extent of a surface m 2: L 2: extensive, bivector or scalar Area density: ρ A: Mass per unit area ...
Until his death in 2016, German astronomer Lutz D. Schmadel compiled these citations into the Dictionary of Minor Planet Names (DMP) and regularly updated the collection. [4] [5] Based on Paul Herget's The Names of the Minor Planets, [6] Schmadel also researched the unclear origin of numerous asteroids, most of which had been named prior to ...
Today's Wordle Answer for #1316 on Saturday, January 25, 2025. Today's Wordle answer on Saturday, January 25, 2025, is CRISP. How'd you do? Up Next:
In general D and H depend on both E and B, on location and time, and possibly other physical quantities. In applications one also has to describe how the free currents and charge density behave in terms of E and B possibly coupled to other physical quantities like pressure, and the mass, number density, and velocity of charge-carrying particles.