Physics:Quantum field theory in curved spacetime - Revision history

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	{{Short description\|Quantum field theory on a classical curved spacetime background}}		{{Short description\|Quantum field theory on a classical curved spacetime background}}Book II

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	'''~~Quantum~~ field theory in curved spacetime''' studies quantum fields on a classical curved spacetime background. It is not a full theory of quantum gravity because the geometry is not itself quantized, but it captures important effects where matter fields are quantum while gravity is treated classically. It is central to Hawking radiation, the Unruh effect, cosmological particle creation, and semiclassical gravity.~~<ref>{{cite web \|title=~~Quantum field theory in curved spacetime ~~\|url=https://en~~.~~wikipedia.org/wiki/Quantum_field_theory_in_curved_spacetime \|website=Wikipedia \|access-date=19 May 2026}}</ref><ref>{{cite book \|last=Wald \|first=Robert M~~. ~~\|title=Quantum Field Theory in Curved Spacetime and Black Hole Thermodynamics \|publisher=University of Chicago Press \|year=1994 \|id=ISBN 978-0-226-87027-4}}</ref>~~		'''field theory in curved spacetime''' is a Book II topic in the Quantum Collection. Quantum field theory in curved spacetime studies quantum fields on a classical curved spacetime background. It is not a full theory of quantum gravity because the geometry is not itself quantized, but it captures important effects where matter fields are quantum while gravity is treated classically. It is central to Hawking radiation, the Unruh effect, cosmological particle creation, and semiclassical gravity. Quantum field theory in curved spacetime studies quantum fields on a classical curved spacetime background. It is not a full theory of quantum gravity because the geometry is not itself quantized, but it captures important effects where matter fields are quantum while gravity is treated classically.
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	== Intermediate theory ==		== Intermediate theory ==
	QFT in curved spacetime is an intermediate step toward quantum gravity. It is expected to work when spacetime curvature is not Planckian and when the quantum fields do not strongly back-react on the geometry.<ref>{{cite book \|last=Rovelli \|first=Carlo \|title=Quantum Gravity \|publisher=Cambridge University Press \|year=2004 \|id=ISBN 978-0-521-83733-0}}</ref>		QFT in curved spacetime is an intermediate step toward quantum gravity. It is expected to work when spacetime curvature is not Planckian and when the quantum fields do not strongly back-react on the geometry.<ref>{{cite book \|last=Rovelli \|first=Carlo \|title=Quantum Gravity \|publisher=Cambridge University Press \|year=2004 \|id=ISBN 978-0-521-83733-0}}</ref>

			== Description ==
			'''field theory in curved spacetime''' is a matter-scale concept used to organize how quantum theory describes atoms, particles, fields, condensed matter, plasma, or spacetime-related systems. In the Quantum Collection it is placed by scale so the reader can move from materials and molecules down to subatomic degrees of freedom.

			== Quantum context ==
			At this scale, the relevant behavior is controlled by quantized states, interactions, conservation laws, and the way excitations or particles are observed. The concept is normally linked to measurable properties such as energy, momentum, charge, spin, spectra, scattering rates, or collective modes.

			== Role in the collection ==
			This page provides a compact reference point for related pages in Book II. It should be read together with nearby matter-scale topics and the corresponding foundations in [[Physics:Quantum mechanics\|quantum mechanics]].<ref name="matter-wiki">{{cite web \|url=https://en.wikipedia.org/wiki/Quantum_mechanics \|title=Quantum mechanics \|website=Wikipedia \|access-date=2026-05-20}}</ref>

	=See also=		=See also=

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	{{Short description\|Quantum field theory on a classical curved spacetime background}}		{{Short description\|Quantum field theory on a classical curved spacetime background}}Book II

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