Conserved charge for boost !

  1. In (3+1) dimension Poincare group has three types of Symmetries :

    I. Space-time translations - 4
    II. Spatial rotations -3 &
    III. Boosts -3

    Among them, (I) implies "conservation of 4-momentum" ,
    (II) implies "conservation of angular momentum" ,

    But what "Physical entity" is conserved for BOOSTS ??
  2. jcsd
  3. Look here and here.
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