# 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:
 air× 135 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… dark-matter× 134 probability× 133 stars× 133 rotation× 133 Circular motion about a central point or axis spring× 132 An object such as a metal coil or air-filled tube which provides a force opposing the direction of deformation. tensors× 131 power× 129 The time rate of change of energy path-integral× 129 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… neutrinos× 129 light, uncharged leptons. The neutrino tag should be applied to question relating to neutrino properties or interactions involving neutrinos. metric-tensor× 128 The variables used in general relativity to describe the shape of spacetime. If your question is about metric units, use the tag "units", and/or "si-units" if it is about the SI system specifically. ads-cft× 128 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… geophysics× 127 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, … curvature× 126 Use this for questions pertaining to curvature of manifolds. Does not need to be specific to general relativity, but also for curvature of e.g. a [tag:calabi-yau] manifold. frequency× 124 the rate of repetitive aspect in the amplitude over a given dimension. antimatter× 124 classical-electrodynamics× 124 quantum-optics× 124 A research field within general optical physics concerned with light and its material interaction: where light is modelled by full quantum mechanical description. speed× 122 the magnitude of velocity. fermions× 121 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 … maxwell-equations× 119 The four fundamental fundamental equations of electromagnetism. phase-transition× 119 variational-principle× 119 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… commutator× 118 study the effect of applying two operators in succession. dirac-equation× 117 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… galaxies× 116 Massive systems held together by gravitational attraction, consisting of stellar associations, star systems, star clusters and types of interstellar clouds, stellar remnants, gasses, cosmic dust and a… notation× 115 ideal-gas× 115 A gas that behaves as randomly moving, non-interacting molecules. This allows a simplified equation of state. interference× 114 drag× 114 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. mass-energy× 113 noethers-theorem× 113 A theorem that relates continuous symmetries (continuous transformations that don't affect the value of the lagrangian) to quantities conserved in time. motion× 113 The change in position of an object relative to a frame of reference. DO NOT USE THIS TAG just because the question contains motion! Almost all physical systems contains motion. Hence it is often … coordinate-systems× 111 quantify location in space. atmosphere× 111 Gaseous layer around a planet, dwarf planet, or a star. particles× 110