# 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:
 hamiltonian× 183 The central term in the hamiltonian formalism. Can be interpreted as an energy input, or "true" energy. particles× 181 biophysics× 181 atmospheric-science× 180 The study of the composition or dynamics of the gaseous layers around planets, often applied to questions on Earth's atmosphere but can be applicable to all planets & moons in the solar system. noethers-theorem× 180 A theorem that relates continuous symmetries (continuous transformations that don't affect the value of the lagrangian) to quantities conserved in time. rotational-kinematics× 180 A tag for questions about rotational motion, including angular velocity and angular acceleration. topology× 173 cosmological-inflation× 173 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 … conventions× 172 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. linear-algebra× 172 To be used for linear algebra, and closely related disciplines such as tensor algebras and maybe clifford algebras. rocket-science× 172 Colloquially referred to as one of the hardest professions, rocket science is actually a common name for spacecraft/space-systems engineering. However, one can also generalize this to include all form… tensor-calculus× 171 wave-particle-duality× 170 popular-science× 169 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… dimensional-analysis× 169 Dimensional analysis means to obtain results by analyzing the units in question, etc. DO NOT USE THIS TAG if your question is about degrees of freedom or spatial dimensions. ads-cft× 167 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… higgs× 167 This higgs field breaks electroweak symmetry and provides mass to particles though a process called the higgs mechanism. The excitation of the higgs field is called a higgs boson. software× 166 perturbation-theory× 161 Perturbation theory refers to methods for understanding physical systems by treating them as small modifications to exactly solvable systems. action× 161 the integral of the Lagrangian over time, or the integral of the Lagrangian Density over both time and space. differentiation× 159 spinors× 159 radioactivity× 157 The property of some materials by which individual atoms decay, emitting energy or particles often transforming into different elements in the process. geophysics× 157 The study of the physical processes and properties of the planet Earth. Applicable to many subjects about Earth, such as its shape, its magnetic field, and ocean currents. statics× 154 Analysis of a system of bodies where all forces are in balance and there is no motion relative to a chosen reference frame. stress-energy-tensor× 153 A rank-2 tensor in relativity, which expresses the flux of energy-momentum along timelike and spacelike axes. Also known as the energy-momentum tensor. In the Einstein field equations, it is the sourc… oscillators× 153 crystals× 152 density× 151 defined as the mass per unit volume of a substance. boundary-conditions× 151 induction× 149 surface-tension× 148 Surface tension occurs due to the tendency of liquid molecules to favor their own kind. Surface tension is important in fluid multiphase systems typically at small length and velocity observers× 146 causality× 145 dark-energy× 143 the unknown form of energy that drives the acceleration of the universe's expansion. physical-constants× 143