Physics:Quantum spacetime: Difference between revisions
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{{Short description|Spacetime considered in quantum and relativistic physics}} | |||
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'''spacetime''' is a Book II topic in the Quantum Collection. 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. 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. 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. | |||
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[[File:Quantum_spacetime_clean_yellow.png|thumb|280px|Spacetime: geometry linking space and time.]] | |||
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== 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.<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> | |||
== Description == | |||
'''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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{{Author|Harold Foppele}} | {{Author|Harold Foppele}} | ||
{{Sourceattribution|Quantum spacetime|1}} | {{Sourceattribution|Physics:Quantum spacetime|1}} | ||
Latest revision as of 22:06, 20 May 2026
spacetime is a Book II topic in the Quantum Collection. 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. 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. 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.
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.[1]
Open questions
The main unresolved issues concern how geometry, vacuum structure, horizons, and quantum states behave when gravitational and quantum effects are simultaneously important.[2]
Description
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 quantum mechanics.[3]
See also
Table of contents (84 articles)
Index
Full contents
References
- ↑ 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.
- ↑ "Quantum mechanics". https://en.wikipedia.org/wiki/Quantum_mechanics.
Source attribution: Physics:Quantum spacetime