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 difficult technical problem that limits the usability of renewable sources of energy to replace traditional fossil fuel sources
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A theory of interacting fields of arbitrary spin. Generalizes Yang-Mills as a theory of spin-one, gravity as a theory of spin-two to fields of any spin.
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The Green-Schwarz formalism, or the superspace-formalism, are formalisms for supersymmetry with explicit spacetime supersymmetry.
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A repulsive force that exists in quantum mechanics between identical fermions due to the Pauli exclusion principle.
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if you have the bragging rights.
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the problem of finding the path between two points such that the transit time under specified conditions is minimized.
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a method of isolating divergencies in scattering amplitudes.
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matter in a state that has properties between those of conventional liquid and those of solid crystal.
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The average length that a molecule will travel in a fluid before colliding with another molecule.
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Heavy ion collisions involve large atomic nuclei, and are run at modern particle accelerators like RHIC and the LHC.
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