Year: 2008
Type: article
Abstract: After establishing the positivity constraint and spin content of the theory for gravitons interacting with a necessarily, and a priori, non‐conserved external energy‐momentum tensor, the expectation value formalism of the theory is developed at finite temperature in the functional differential treatment of quantum field theory. The necessity of having, a priori, a non‐conserved external energy‐momentum tensor is an obvious technical requirement so that its respective ten components may be varied independently in order to generate expectation values and non‐linearities in the theory. The covariance of the induced Riemann curvature tensor, in the initial vacuum, is established even for the quantization in a gauge corresponding only to two physical states of the gravitons as established above. As an application, the induced correction to the metric and the underlying geometry is investigated due to a closed string arising from the Nambu action as a solution of a circularly oscillating string as, perhaps, the simplest generalization of a limiting point‐like object. Finally it is discussed on why the geometry of spacetime may, in general, depend on temperature due to radiative corrections and its physical significance is emphasized.
Source: Fortschritte der Physik
Authors: E.B. Manoukian, S. Sukkhasena
Institution: Suranaree University of Technology
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2122721774