2 papers
gr-qc2001
Regular Type III and Type N Approximate Solutions
Philip Downes, Paul MacAllevey, Bogdan Nita +1
New type III and type N approximate solutions which are regular in the linear approximation are shown to exist. For that, we use complex transformations on self-dual Robinson-Traut…
gr-qc2001
Note on Invariants of the Weyl Tensor
Bogdan Nita, Ivor Robinson
Algebraically special gravitational fields are described using algebraic and differential invariants of the Weyl tensor. A type III invariant is also given and calculated for Robin…