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Planck speedRapiditySpeed of lightLightspeedPlanck velocityLorentz factorEinstein barrierPlanck accelerationSubvelocityLambdaPath lengthSpecial relativitySommerfeld parameterBetaPlanck lengthDirac constantSlownessInformation velocityPlanck momentumPlanck's constantEinstein's constantβ-particleRefractive indexBethe formulaSpeed of soundVelocityGroup velocityKc/sDe broglie wavelengthRydberg constantStefan-boltzmann constantEinstein constantRelativistic massPlanck constantHartreeRelativistic mechanicsDirac's constantNonrelativistic mechanicsSupermomentumPhase velocityLength contractionFour-velocityTraveltimeBeamwidthPhoton tunnellingTime dilationFine-structure constantSommerfeld's constantLuxonEinsteinian relativityBremermann's limitMach numberTachyonCoefficient of restitutionOmegaWave vectorAcceleronTangential velocitySlipGravitational radiationGyratonBeta rayLorentz-fitzgerald contractionPulsatanceCosmological constantWavelengthCoulomb's constantSuperbradyonQuantum unit of spinKineSuperpotentialDelta-vTime dilatationCurieCold dark matterWave packetProper timeBoltzmann's constantPbarGammaJiffyRate constantPlanck currentKnudsen numberTime constantTranslonPsi functionPlanck volumeEquivelocityPseudorapidityLambda particleLight clockMaxwell-boltzmann distributionTransmittanceBoostBeta-beamSecondRest energyPseudovelocityFine structure constant