# Tags

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.

 Type to find tags:
 coordinate-systems× 258 quantify location in space. path-integral× 258 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… spectroscopy× 256 the practice of separating a signal by frequency (or sometimes energy or momentum) and analyzing the resulting spectrum. dark-matter× 256 Matter not observed directly but inferred to exist based upon its gravitational effects dimensions× 256 for dimensions of a manifold, typically the space-time. DO NOT USE THIS TAG for dimension of a physical quantity. lie-algebra× 255 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… geometry× 255 To be used for questions on geometry closely pertaining to physics. Includes differential geometry and euclidean geometry. spring× 254 An object such as a metal coil or air-filled tube which provides a force opposing the direction of deformation. ideal-gas× 253 A gas that behaves as randomly moving, non-interacting molecules. This allows a simplified equation of state. variational-principle× 252 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… rotation× 251 Circular motion about a central point or axis notation× 250 air× 250 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… quantum-computer× 247 power× 247 The time rate of change of energy stars× 245 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… drag× 245 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. polarization× 244 Polarization characterizes the oscillations in time the electromagnetic field is doing in the plane perpendicular to the propagation direction of a wave conventions× 242 a set of agreed, stipulated, or generally accepted norms. It typically helps common efficiency or understanding but is not required, as opposed to a strict standard or protocol. solar-system× 241 The Sun plus the collection of bodies in orbit around the Sun such as planets, dwarf planets, moons, asteroids, comets, etc. quantum-optics× 240 A research field within general optical physics concerned with light and its material interaction: where light is modelled by full quantum mechanical description. fermions× 237 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 … gauss-law× 236 A law in Classical Electromagnetism and Newtonian Gravity. feynman-diagram× 234 interference× 233 mass-energy× 230 speed× 227 the magnitude of velocity. integration× 226 antimatter× 226 Analogous to matter, but with charge of the particles opposite to their ordinary matter counterparts. representation-theory× 225 neutrinos× 224 light, uncharged leptons. The neutrino tag should be applied to question relating to neutrino properties or interactions involving neutrinos. phase-transition× 223 hamiltonian× 221 The central term in the hamiltonian formalism. Can be interpreted as an energy input, or "true" energy. symmetry-breaking× 219 geometric-optics× 218 The subfield of optics in which light propagation is approximated in terms of rays. It mainly includes reflection and refraction on surfaces. rotational-kinematics× 216 A tag for questions about rotational motion, including angular velocity and angular acceleration.