Roberto Niardi (Università di Napoli), Divergences of the electromagnetic energy-momentum tensor in curved space-time

by Roberto Niardi

Friday 12 Feb 2021, 14:30 → 16:30 Europe/Rome

Zoom

The point-splitting method is a valuable tool for regularizing divergent
observables such as the stress-energy tensor, and hence one finds that
such a tensor can be completely expressed in terms of second
derivatives of the Hadamard Green function.
By using the Fock-Schwinger-DeWitt asymptotic expansion, one obtains a
series expansion for the stress-energy tensor.
Its divergent part can be isolated, and a concise formula is obtained
which holds for every space-time metric;
it is made even more explicit in the physically relevant particular cases
of Ricci-flat and maximally symmetric spaces,
and fully evaluated for some examples of physical interest: Kerr and
Schwarzschild metrics and de Sitter space-time.

https://arxiv.org/abs/2102.00478

 

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