Sandage–Loeb test (proposed cosmological test)
E911976
The Sandage–Loeb test is a proposed cosmological method that aims to directly measure the universe’s expansion over time by detecting tiny shifts in the redshifts of distant astronomical objects.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| Sandage–Loeb test | 0 |
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
cosmological test
ⓘ
observational cosmology method ⓘ proposed experiment ⓘ |
| aimsTo |
directly measure the expansion of the universe over time
ⓘ
measure the temporal variation of cosmological redshift ⓘ |
| alsoKnownAs |
Sandage–Loeb effect
NERFINISHED
ⓘ
cosmic redshift drift ⓘ redshift drift test NERFINISHED ⓘ |
| appliesTo |
distant galaxies
ⓘ
high-redshift objects ⓘ quasars ⓘ |
| basedOn | measurement of redshift drift ⓘ |
| canConstrain |
Hubble parameter as a function of redshift
ⓘ
deceleration parameter ⓘ equation of state of dark energy ⓘ |
| category | cosmological distance and expansion probes ⓘ |
| characteristic |
directly probes dynamics of the universe without relying on standard candles
ⓘ
does not require standard rulers ⓘ model-independent measurement of expansion rate evolution ⓘ |
| distinctFrom |
baryon acoustic oscillation measurements
ⓘ
cosmic microwave background anisotropy measurements ⓘ supernova distance measurements ⓘ |
| field |
cosmology
ⓘ
observational astronomy ⓘ physical cosmology ⓘ |
| measures |
change of redshift as a function of observer time
ⓘ
time derivative of cosmological redshift ⓘ |
| namedAfter |
Abraham Loeb
NERFINISHED
ⓘ
Allan Sandage NERFINISHED ⓘ |
| proposedBy |
Abraham Loeb
NERFINISHED
ⓘ
Allan Sandage NERFINISHED ⓘ |
| proposedInstrument |
European Extremely Large Telescope
NERFINISHED
ⓘ
Extremely Large Telescope NERFINISHED ⓘ HIRES spectrograph for ELT NERFINISHED ⓘ high-resolution spectrograph CODEX NERFINISHED ⓘ |
| requires |
centimeter-per-second radial velocity precision
ⓘ
decades-long monitoring of sources ⓘ extremely stable spectrographs ⓘ long observational time baselines ⓘ |
| sensitivityRange | redshift between about 2 and 5 ⓘ |
| signalMagnitude | very small redshift drift per year ⓘ |
| tests |
cosmic expansion history
ⓘ
cosmological models ⓘ dark energy models ⓘ ΛCDM model NERFINISHED ⓘ |
| timeScale | observations over 10 to 30 years ⓘ |
| uses |
Lyman-alpha forest absorption lines
ⓘ
high-resolution spectroscopy of quasars ⓘ spectroscopy of distant astronomical sources ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Allan R. Sandage