A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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a system of units where certain dimensionful constants are set to 1. This often simplifies various formulae.
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A transition by which the energy of at least one photon is completely transferred to a material.
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The rate of change of velocity of a body per unit of time.
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is appropriate for questions dealing with the physics of beams in accelerators (synchrotrons, cyclotrons, linacs, betatrons and other types of accelerators); the ways in which beams are generated; the…
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the interdisciplinary science that deals with the study of all mechanical waves in gases, liquids, and solids including vibration, sound, ultrasound and infrasound. Applications of acoust…
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the integral of the Lagrangian over time, or the integral of the Lagrangian Density over both time and space.
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Thermodynamic processes that occur without exchanging heat between the system and its environment.
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a special case of the holographic principle. It states that a quantum gravitating theory in Anti-de-Sitter (AdS) space is exactly equivalent to the gauge theory/Conformal Field Theory (CFT…
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A subset of [tag:fluid-dynamics] concerning primarily forces such as lift and drag generated on bodies as they move through gasses or as gasses move through the body (typically air).
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Aether(or ether) relates to the material which supposedly fills the entire universe. It is a concept used to understand action at a distance. Aether was described by Huygen as an "omnipresent, perfect…
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a layer of gases that surround it, permitting life and protecting life by absorbing ultraviolet solar radiation, warming the surface by retaining the heat and mitigating the temp…
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man-made vehicles intended to operate while flying through Earth's atmosphere.
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related to scattering amplitudes.
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The conserved quantity arising from a rotational invariance. Combine with rotational-dynamics for the classical mechanics approach and quantum-mechanics for the QM interpretation
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The time derivative of angular position used when studying rotating objects or systems.
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for anomalies in a symmetry, either in classical or quantum theories. This tag should **not** be used for anomalies in a measurement.
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a spacetime with a constant negative Ricci Scalar.
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Analogous to matter, but with charge of the particles opposite to their ordinary matter counterparts.
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the generic name for the particles which interchange among other according to the representation(s) of the braid group.