A Lorentz scalar is unchanged under a Lorentz transformation. Contracting every Lorentz index in a tensor expression produces a scalar when the constituent fields transform covariantly.
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- Active Lorentz transformation of a vector field
- Axial-current squared interaction
- Central charge in supersymmetry
- Chiral scalar spinor overlap
- Covariant transversality of a vacuum plane wave
- Dirac spinor pseudo-unitarity
- Four-divergence
- Four-gradient
- Four-wavevector
- Local Lagrangian argument for CPT invariance
- Lorentz invariance of plane-wave phase
- Lorentz-invariant specific intensity
- Maxwell Lagrangian
- Parity restriction on renormalizable pseudoscalar Yukawa counterterms
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- Polarization-magnetization tensor
- Proper orthochronous Lorentz transformation
- Rest-frame reduction of scalar transition matrix elements
- Scalar field theory
- Two-dimensional N=(1,1) superspace
- Vacuum-to-one-particle scalar matrix element
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In the context of special relativity, a Lorentz scalar is a quantity that remains invariant under Lorentz transformations, which relate the physical quantities measured in different inertial reference frames. To elaborate, a Lorentz transformation is a mathematical operation that accounts for the effects of relative motion at speeds close to the speed of light, specifically how time and space coordinates change for observers in different inertial frames.