# Planck time

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## Planck time

A time equal to 5.4 × 10–44 second, and defined as √(hG /2πc 5); h is the Planck constant, G the gravitational constant, and c the speed of light. The uncertainty principle of quantum mechanics prevents any speculation on times shorter than the Planck time after the Big Bang.

## Planck time

[′pläŋk ‚tīm]
(physics)
The constant (Gh /2π c 5)1/2with dimensions of “time” formed from Planck's constant h, the gravitational constant G, and the speed of light c ; approximately 10-43 second.
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References in periodicals archive ?
OUR MINDS ONLY EXIST IN THE INSTANT OF PLANCK time, roughly [10.
a long time compared to the femtosecond, the attosecond and the shortest possible unit of time - known as Planck time.
3]] are the fundamental constituents of space (namely that it is not possible to observe areas or volumes smaller than Planck scale) and that Planck time [t.
Looking far enough back, one finds not an edge, but Planck Time, that moment in the early expansion of the universe beyond which current theoretical physics can no longer provide any explanations.
In the final chapters he explores Planck Time and the ultimate fate of the universe.
This is the Planck time, the time it takes light to cross the Planck length.
The invariability of Planck constant is a consequence of the fact that, although individually Planck energy and Planck time change in time, their product remains constant:
The Planck time is also calculated from the gravitational constant, the speed of light and Planck's constant in such a way that moving at one Planck length per one Planck time would be equal to the speed of light.
The constants contained within his formulation, those of Planck and Boltzmann (h and k), became fundamental to all of physics, leading to the development of Planck length, Planck mass, Planck time, and Planck temperature [3, p.
Let us now consider relation (4) and from that let us try to obtain the mass of the "super-particle" universe at very early times, and near Planck time.
Corresponding expressions for the Planck length and Planck time follow easily and it is seen that the ratio of Planck mass to Planck length equals [c.
Therefore, the choice for the energy fluctuation time during a spontaneous symmetry breaking phase transition of electron pairs is taken to be the Planck time [T.

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