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We define a set of fully Lorentz-invariant wave packets and show that itspans the corresponding one-particle Hilbert subspace, and hence the whole Fockspace as well, with a manifestly Lorentz-invariant completeness relation(resolution of identity). The position-momentum uncertainty relation for thisLorentz-invariant wave packet deviates from the ordinary Heisenberg uncertaintyprinciple, and reduces to it in the non-relativistic limit.

A complete set of Lorentz-invariant wave packets and modified uncertainty relation