The Cotton tensor and Chern-Simons invariants in dimension 3: an introduction
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MOROIANU, Sergiu. The Cotton tensor and Chern-Simons invariants in dimension 3: an introduction. In: Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, 2015, nr. 2(78), pp. 3-20. ISSN 1024-7696.
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Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica
Numărul 2(78) / 2015 / ISSN 1024-7696 /ISSNe 2587-4322

The Cotton tensor and Chern-Simons invariants in dimension 3: an introduction
CZU: 512.7+514.76+515.16+517.5

Pag. 3-20

Moroianu Sergiu
 
"Simion Stoilov" Institute of Mathematics of Romanian Academy
 
 
Disponibil în IBN: 11 decembrie 2015


Rezumat

We review, with complete proofs, the theory of Chern-Simons invariants for oriented Riemannian 3-manifolds. The Cotton tensor is the first-order variation of the Chern-Simons invariant. We deduce that it is conformally invariant, and trace- and divergence-free, from the corresponding properties of the Chern-Simons invariant. Moreover, the Cotton tensor vanishes if and only if the metric is locally conformally flat. In the last part of the paper we survey the link of Chern-Simons invariants with the eta invariant and with the central value of the Selberg zeta function of odd type.

Cuvinte-cheie
Chern-Simons invariant, Schouten tensor, Cotton tensor, locally conformally flat metrics, eta invariant, Selberg zeta function of odd type.