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gr-qc1995
Consequences of the noncompactness of the Lorentz group
Hans - Juergen Schmidt
The following four statements have been proven decades ago already, but they continue to induce a strange feeling: - All curvature invariants of a gravitational wave vanish - in sp…
gr-qc1995
An alternate Hamiltonian formulation of fourth-order theories and its application to cosmology
Hans - Jürgen Schmidt
An alternate Hamiltonian H different from Ostrogradski's one is found for the Lagrangian L = L(q, \dot q, \ddot q). We add a suitable divergence to L and insert a=q and b=\ddot q.…