# 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:
 particles× 168 rotational-kinematics× 167 A tag for questions about rotational motion, including angular velocity and angular acceleration. popular-science× 167 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… biophysics× 166 topology× 164 diffraction× 163 cosmological-inflation× 163 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 … noethers-theorem× 162 A theorem that relates continuous symmetries (continuous transformations that don't affect the value of the lagrangian) to quantities conserved in time. hamiltonian× 160 The central term in the hamiltonian formalism. Can be interpreted as an energy input, or "true" energy. linear-algebra× 159 To be used for linear algebra, and closely related disciplines such as tensor algebras and maybe clifford algebras. wave-particle-duality× 158 rocket-science× 157 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… software× 156 geophysics× 156 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. dimensional-analysis× 155 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× 155 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× 154 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. tensor-calculus× 152 radioactivity× 146 The property of some materials by which individual atoms decay, emitting energy or particles often transforming into different elements in the process. crystals× 145 action× 143 the integral of the Lagrangian over time, or the integral of the Lagrangian Density over both time and space. conventions× 142 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. perturbation-theory× 142 Perturbation theory refers to methods for understanding physical systems by treating them as small modifications to exactly solvable systems. statics× 141 Analysis of a system of bodies where all forces are in balance and there is no motion relative to a chosen reference frame. causality× 139 boundary-conditions× 138 density× 138 defined as the mass per unit volume of a substance. spinors× 137 surface-tension× 135 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 topological-field-theory× 135 for topological field theory (Tft) and topological string theory (tst) questions. differentiation× 133 oscillators× 133 observers× 132 hydrogen× 132 Could refer to (1) A hydrogen molecule; two hydrogen atoms bonded together or (2) A hydrogen atom; One electron electromagnetically interacting with a nucleus made of a single proton. Hydrogen atoms a… higgs-boson× 131 A particle that emerges from the theoretical mechanism that is thought to give other particles mass. physical-constants× 130