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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the electromagnetic radiation in the microwave band which can be observed throughout the whole universe, not connected to any astronomical object. Its spectrum…
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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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The quark model postulates that the hadrons such as protons and neutrons have an inner structure; quarks.
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a new kind of order in quantum matter, which corresponds to pattern of long-range quantum entanglement. See http://en.wikipedia.org/wiki/Topological_order
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for questions on information theory applied to physics, especially in the fields of statistical mechanics and thermodynamics, the black hole information paradox, complexity of dynamical a…
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The conditions on the edges of a domain when solving ordinary or partial differential equations.
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Radiation that comes from pair production quantum effects in close vicinity to an event horizon, leading to the potential for eventual evaporation of black holes. Two mirror particles are created wit…
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A specific reference frame that describes its coordinates in a manner that does not depend on time and is isotropic.
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Theory, experiments and calculations related the physics of plasmas, i.e., matter constituted by ionized atoms.
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Quantization refers to the procedure or methodology for replacing a classical system by a quantum system. If the question is about the quantized or discrete behavior of a phenomenon use the [tag:discr…
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The study of radiation and radioactive materials and it's creation, safety, and applications.
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a branch of mechanics that deals with the analysis of the kinematics and the mechanical behavior of materials modeled as a continuous mass rather than as discrete particles.
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filling in the unspecified details of elegant-sounding descriptions of experimental methods.
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Techniques and methods for computing, estimating, or placing bounds on the errors of expressions (formulas) based on knowledge of error distributions, error intervals or bounds of variables and parame…
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Electromagnetic waves, visible to the human eye if between about 400 and 700 nm in wavelength.
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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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