Physics:Quantum spacetime: Difference between revisions
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{{Short description| | {{Short description|Spacetime considered in quantum and relativistic physics}} | ||
{{Quantum matter backlink|Vacuum and spacetime}} | {{Quantum matter backlink|Vacuum and spacetime}} | ||
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'''Quantum spacetime''' is | '''Quantum spacetime''' refers to spacetime as it appears when relativistic geometry and quantum theory must be considered together. In established physics, spacetime is classical in relativity, while matter and fields are quantum; a full quantum description of spacetime remains an open problem.<ref>{{cite web |title=Spacetime |url=https://en.wikipedia.org/wiki/Spacetime |website=Wikipedia |access-date=20 May 2026}}</ref><ref>{{cite book |last=Wald |first=Robert M. |title=General Relativity |publisher=University of Chicago Press |year=1984 |id=ISBN 978-0-226-87033-5}}</ref> | ||
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[[File: | [[File:Quantum_spacetime_clean_yellow.png|thumb|280px|Spacetime: geometry linking space and time.]] | ||
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== | == Conceptual role == | ||
This | This topic lies at the boundary between quantum field theory, relativity, cosmology, and the foundations of measurement. It clarifies what is meant by fields, particles, vacuum, and geometry.<ref>{{cite book |last=Wald |first=Robert M. |title=General Relativity |publisher=University of Chicago Press |year=1984 |id=ISBN 978-0-226-87033-5}}</ref> | ||
== Open questions == | |||
The main unresolved issues concern how geometry, vacuum structure, horizons, and quantum states behave when gravitational and quantum effects are simultaneously important.<ref>{{cite book |last=Rovelli |first=Carlo |title=Quantum Gravity |publisher=Cambridge University Press |year=2004 |id=ISBN 978-0-521-83733-0}}</ref> | |||
=See also= | =See also= | ||
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{{Author|Harold Foppele}} | {{Author|Harold Foppele}} | ||
{{Sourceattribution|Quantum spacetime|1}} | {{Sourceattribution|Physics:Quantum spacetime|1}} | ||
Revision as of 22:04, 19 May 2026
Quantum spacetime refers to spacetime as it appears when relativistic geometry and quantum theory must be considered together. In established physics, spacetime is classical in relativity, while matter and fields are quantum; a full quantum description of spacetime remains an open problem.[1][2]
Conceptual role
This topic lies at the boundary between quantum field theory, relativity, cosmology, and the foundations of measurement. It clarifies what is meant by fields, particles, vacuum, and geometry.[3]
Open questions
The main unresolved issues concern how geometry, vacuum structure, horizons, and quantum states behave when gravitational and quantum effects are simultaneously important.[4]
See also
Table of contents (84 articles)
Index
Composite matter
Sub-molecular
Full contents
1. Materials (6) Back to index
2. Matter (5) Back to index
3. Plasma and fusion physics (6) Back to index
4. Molecules (6) Back to index
5. Nuclear matter (6) Back to index
6. Atoms (7) Back to index
7. Particles (12) Back to index
8. Composite particles (12) Back to index
9. Fields (12) Back to index
10. Vacuum and spacetime (12) Back to index
References
- ↑ "Spacetime". https://en.wikipedia.org/wiki/Spacetime.
- ↑ Wald, Robert M. (1984). General Relativity. University of Chicago Press. ISBN 978-0-226-87033-5.
- ↑ Wald, Robert M. (1984). General Relativity. University of Chicago Press. ISBN 978-0-226-87033-5.
- ↑ Rovelli, Carlo (2004). Quantum Gravity. Cambridge University Press. ISBN 978-0-521-83733-0.
Author: Harold Foppele
Source attribution: Physics:Quantum spacetime