In physics, the Planck temperature (TP) is the unit of temperature in the system of natural units known as Planck units. Its name honors the German physicist Max Planck, who proposed it.
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[edit] Definition
The Planck temperature is defined as:
= where:
- mP = the Planck mass
- c = speed of light in a vacuum
is the reduced Planck constant defined as 
- k = Boltzmann constant
- G = Gravitational constant
The two digits between the parentheses denote the standard error of the last two digits of the estimated value.
[edit] Significance
As for most other Planck units, a Planck temperature of 1 (unity) is a fundamental limit of quantum theory, in combination with gravitation, as presently understood. At temperatures greater than or equal to TP, current physical theory breaks down because we lack a theory of quantum gravity.[1]
[edit] Notes
- ^ Nova: Absolute Hot
[edit] See also
[edit] External links
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