Naslov
Generalizations of normal ordering and applications to quantization in classical backgrounds

Autori
Nikolić, Hrvoje

Izvornik
General relativity and gravitation (0001-7701) 37 (2005), 2; 297-311

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
normal ordering ; quantization ; classical background

Sažetak
A nonlocal method of extracting the positive (or the negative) frequency part of a field, based on knowledge of a 2-point function, leads to certain natural generalizations of the normal ordering of quantum fields in classical gravitational and electromagnetic backgrounds and illuminates the origin of the recently discovered nonlocalities related to a local description of particles. A local description of particle creation by gravitational backgrounds is given, with emphasis on the case of black-hole evaporation. The formalism reveals a previously hidden relation between various definitions of the particle current and those of the energy-momentum tensor. The implications to particle creation by classical backgrounds, as well as to the relation between vacuum energy, dark matter, and cosmological constant, are discussed.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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