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--- advanced_notions:quantum_field_theory:qft_curved_spacetime [2018/05/30 06:18]
89.12.128.15 [Intuitive]
+++ advanced_notions:quantum_field_theory:qft_curved_spacetime [2018/05/30 06:21]
89.12.128.15 [Intuitive]
@@ Line 4: / Line 4: @@
 Since in general relativity the curvature corresponds to the gravitational field, QFT in curved spacetime corresponds to a normal QFT with an external source (=the gravitational field).
-For a curvature that depends on the time, we are dealing with a time varying source that can, for example, produce particles.
+For a curvature that depends on the time, we are dealing with a time varying source that can, for example, produce particles. A proper analogy is a driven harmonic oscillator.
-A proper analogy is a driven harmonic oscillator.
+It is important to note that QFT in curved spacetime is not quantum gravity. In a theory of quantum gravity we would take the backreaction of quantum effects on the spactime into account. In contrast, in curved spacetime QFT the curved spacetime is merely a background structure, i.e. an external source and not treated quantum mechanically.