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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the practice of separating a signal by frequency (or sometimes energy or momentum) and analyzing the resulting spectrum.
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Subdiscipline of theoretical physics which consists in the study of physics problems using numerical algorithms. PLEASE NOTE that questions about computational methods and/or programming are OFF-TOPIC…
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Path integral formulation (Due to Feynman) is a major formulation of Quantum Mechanics along with Matrix mechanics (Due to Heisenberg and Pauli), Wave Mechanics (Due to Schrodinger), and Variational M…
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To be used for questions on geometry closely pertaining to physics. Includes differential geometry and euclidean geometry.
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Circular motion about a central point or axis
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The Sun plus the collection of bodies in orbit around the Sun such as planets, dwarf planets, moons, asteroids, comets, etc.
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the rate of repetitive aspect in the amplitude over a given dimension.
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quantify location in space.
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Matter not observed directly but inferred to exist based upon its gravitational effects
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light, uncharged leptons. The neutrino tag should be applied to question relating to neutrino properties or interactions involving neutrinos.
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A research field within general optical physics concerned with light and its material interaction: where light is modelled by full quantum mechanical description.
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The four fundamental fundamental equations of electromagnetism.
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The time rate of change of energy
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particles with an intrinsic angular momentum (i.e. spin) equal to a "half integer" number of fundamental units: $\frac{(2n+1)}{2} \hbar$ for integer $n$. Fermions are required to be in a …
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must be answered in a manner that can be understood by a general audience with at most a basic understanding of physics, mathematics and related sciences. Apply it to questions w…
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astronomical bodies that are (usually) mainly composed of Hydrogen, Helium, and Lithium. They are massive enough that their gravity compresses the matter to the point where nuclear fusion oc…
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An object such as a metal coil or air-filled tube which provides a force opposing the direction of deformation.
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study the effect of applying two operators in succession.
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any of several principles that find the physical trajectory of a system by minimizing or maximizing some value computed over the proposed path (for instance geometric optics can be reproduced by insis…
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the magnitude of velocity.
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A fully relativistic (Lorentz covariant) description, first put forward by Paul Dirac in 1928, of the first quantized, spin one half fermion with nonzero mass. Physical notions to do with this equatio…
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The force on a body resulting from it's motion through a fluid (gas or liquid). This force is directly opposed to the direction of travel.
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A gas that behaves as randomly moving, non-interacting molecules. This allows a simplified equation of state.
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A vector space $\mathfrak{g}$ over some field $F$ and kitted with a bilinear, antisymmetric and Jacobi-identity-fulfilling product ("Lie Bracket" or "commutator"). In physics, most often arises as the…
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physics of the Earth and its environment in space. Its subjects include the shape of the Earth, its gravitational and magnetic fields, the dynamics of the Earth as a whole and of its component parts, …
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Cosmological inflation refers to an era of expansion that lasted for approximately $10^{-34}$ seconds, during which the universe expanded by a factor of approximately $10^26$ in every direction. This …
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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 law in Classical Electromagnetism and Newtonian Gravity.
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