Planck time
E33407
Planck time is the fundamental unit of time in the system of Planck units, representing the shortest meaningful interval of time according to current physical theories, where quantum effects of gravity become significant.
Aliases (1)
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
Planck unit
→
physical constant → unit of time → |
| appearsIn |
Planck epoch in cosmology
→
discussions of the early universe → |
| belongsToCategory |
fundamental physical constants
→
time scales in physics → |
| definedBy |
Max Planck
→
|
| dependsOnConstant |
gravitational constant
→
reduced Planck constant → speed of light in vacuum → |
| hasApproximateValue |
5.391247×10^-44 s
→
|
| hasApproximateValueOrderOfMagnitude |
10^-43 s
→
|
| hasDimension |
time
→
|
| hasFormula |
t_P = sqrt(ħ G / c^5)
→
|
| isDefinedUsing |
G
→
c → ħ → |
| isEpochBoundaryFor |
Planck era of the universe
→
|
| isExampleOf |
natural unit constructed from fundamental constants
→
|
| isFundamentalUnitIn |
Planck unit system
→
natural units → |
| isIndependentOf |
arbitrary human conventions
→
|
| isMuchSmallerThan |
timescales accessible to experiments
→
timescales of particle collisions in current accelerators → |
| isNamedAfter |
Max Planck
→
|
| isScaleWhere |
classical general relativity breaks down
→
quantum field theory in curved spacetime becomes inadequate → quantum gravity effects become significant → |
| isShortestMeaningfulIntervalIn |
current physical theories
→
|
| isTheoreticalLimitFor |
applicability of known physics
→
|
| isTimeLightTravels |
one Planck length in vacuum
→
|
| measuredIn |
seconds
→
|
| partOf |
Planck units
→
|
| relatedTo |
Planck energy
→
Planck length → Planck mass → Planck temperature → |
| symbol |
t_P
→
|
| usedAs |
natural time scale
→
|
| usedIn |
cosmology
→
loop quantum gravity → quantum gravity → string theory → theoretical physics → |
Referenced by (3)
| Subject (surface form when different) | Predicate |
|---|---|
|
Max Planck
→
|
hasNamesake |
|
Planck time
("Planck era of the universe")
→
|
isEpochBoundaryFor |
|
Newtonian gravitational constant G
→
|
usedToDefine |