Quantum field theory in de Sitter space - Renormalization by point-splitting

Details Quantum field theory in de Sitter space - Renormalization by point-splitting Quantum field theory in de Sitter space - Renormalization by point-splitting

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978rspsa.360..117b&link_type=abstract

Royal Society (London), Proceedings, Series A, vol. 360, no. 1700, Mar. 21, 1978, p. 117-134.

Astronomy and Astrophysics

Astrophysics

393

Astrophysics, Field Theory (Physics), Quantum Theory, Space-Time Functions, Gravitational Fields, Stress Tensors, Universe

Scientific paper

The modes of a scalar field in de Sitter space are studied, and quantum two-point functions are constructed. These are then used to compute a finite stress tensor by the technique of covariant point-splitting. A renormalization ansatz based on the DeWitt-Schwinger expansion is proposed, which removes all ambiguities previously present in point-splitting regularization. The results agree in detail with previous work by dimensional regularization, and give rise to an anomalous trace with the conventional coefficient. The treatment is extended to more general situations.

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