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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A tag for questions about rotational motion, including angular velocity and angular acceleration.
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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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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 theorem that relates continuous symmetries (continuous transformations that don't affect the value of the lagrangian) to quantities conserved in time.
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The central term in the hamiltonian formalism. Can be interpreted as an energy input, or "true" energy.
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To be used for linear algebra, and closely related disciplines such as tensor algebras and maybe clifford algebras.
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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…
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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.
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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.
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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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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.
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The property of some materials by which individual atoms decay, emitting energy or particles often transforming into different elements in the process.
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the integral of the Lagrangian over time, or the integral of the Lagrangian Density over both time and space.
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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.
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Perturbation theory refers to methods for understanding physical systems by treating them as small modifications to exactly solvable systems.
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Analysis of a system of bodies where all forces are in balance and there is no motion relative to a chosen reference frame.
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defined as the mass per unit volume of a substance.
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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
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for topological field theory (Tft) and topological string theory (tst) questions.
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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…
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A particle that emerges from the theoretical mechanism that is thought to give other particles mass.
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