Wednesday, July 30, 2014

special relativity - Energy-Momentum Tensor under Lorentz Transformation


In relativity, the symmetric energy-momentum tensor is given by Tij,

where T00 is the energy density and 1cT10 is the momentum density. Thus: (1cT00dV,1cT10dV)T
is the 4-momentum. Under a Lorentz transformation, this should transform like 4-vectors where 1cT00dV=[1cT00dV+vc2T10dV](1v2c2)1/2dV=dV1v2c2.
After simplifications, we have: T00=[T00+vcT10](1v2c2)1
But if we apply the Lorentz transformation to the tensor directly we get T00=[T00+vcT10+v2c2T 11](1v2c2)1
What accounts for the difference? I think the first is wrong but have no idea why.




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