## Properties of solutions in $$2+1$$ dimensions.(English)Zbl 1026.83044

Summary: We solve the Einstein equations for the 2 + 1 dimensions with and without scalar fields. We calculate the entropy, Hawking temperature and the emission probabilities for these cases. We also compute the Newman-Penrose coefficients for different solutions and compare them.

### MSC:

 83C80 Analogues of general relativity in lower dimensions 83C60 Spinor and twistor methods in general relativity and gravitational theory; Newman-Penrose formalism
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### References:

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