Atlas of Fundamental Concepts

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Canonical static concept record

Cosmological redshift

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Summary

The change in observed wavelength caused by cosmological expansion between emission and observation; for comoving source and observer in an FLRW spacetime, 1+z=a(t0)/a(tem)1+z=a(t_0)/a(t_{\rm em}).

Record metadata

Canonical name
Cosmological redshift
Concept ID
cosmological_redshift
Content version
2.3.0
Primary field
Physics
Fields
Physics
Primary domain
Cosmology
Domains
Cosmology, Relativity & gravitation, Experiments & observations
Alternate terminology
No alternate terminology is currently authored for this record.
Concept type
Observable expansion effect
Status
Observed

Concept sources

Incoming relations (arrows to this concept)

Each relation below ends at this concept.

Expanding universeCosmological redshift

Permalink to relation

This is an authored directed relation from the source endpoint to the target endpoint.

Relation ID
expanding_universe_to_cosmological_redshift
Relation type
State / property description state-description
Direction
source โ†’ target
Endpoint roles
source: Has state / property description; target: State / property description of
Authored annotation
wavelength stretching by expansion

Authored explanation

For comoving emission and observation in an FLRW model, expansion changes photon wavelength by the scale-factor ratio 1+z=a(t0)/a(tem)1+z=a(t_0)/a(t_{\rm em}).

How to interpret this relation type

The target represents a state, property, observable, or state-dependent description associated with the source system or theory.

Relation sources

Hubbleโ€“Lemaรฎtre lawCosmological redshift

Permalink to relation

This is an authored directed relation from the source endpoint to the target endpoint.

Relation ID
hubble_lemaitre_law_to_cosmological_redshift
Relation type
Describes / governs describes-governs
Direction
source โ†’ target
Endpoint roles
source: Describes / governs; target: Described / governed by
Authored annotation
low-redshift distance relation

Authored explanation

In the low-redshift regime, measured cosmological redshift supplies the recession-rate proxy in the approximately linear relation czโ‰ƒH0dcz\simeq H_0d; the exact relativistic relation is model dependent.

How to interpret this relation type

A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.

Relation sources

Outgoing relations (arrows from this concept)

Each relation below starts at this concept.

No direct relations are authored in this direction.