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A Planck particle, named after physicist Max Planck, is a hypothetical particle defined as a tiny black hole whose Compton wavelength is equal to its Schwarzschild radius. Its mass is thus approximately the Planck mass, and its Compton wavelength and Schwarzschild radius are about the Planck length. Planck particles are sometimes used as an exercise to define the Planck mass and Planck length. They play a role in some models of the evolution of the universe during the Planck epoch.

Compared for example to a proton, the Planck particle would be extremely small (its radius being equal to the Planck length, which is about 10−20 times the proton's radius) and heavy (the Planck mass being 1019 times the proton's mass).

It is thought that such a particle would vanish in Hawking radiation.

Derivation

While opinions vary as to its proper definition, the most common definition of a Planck particle is a particle whose Compton wavelength is equal to its Schwarzschild radius. This sets the relationship:

$$\lambda = \frac{h}{m c} = \frac{2 G m}{c^2}$$

Thus making the mass of such a particle:

$$m = \sqrt{\frac{h c}{2 G}}$$

This mass will be $$\sqrt{\pi }$$ times larger than the Planck mass, making a Planck particle 1.772 times more massive than the Planck unit mass.

Its radius will be the Compton wavelength:

$$r = \frac{h}{m c} = \sqrt{\frac{2G h}{c^3}}$$

Dimensions

Using the above derivations we can substitute the universal constants h, G, and c, and determine physical values for the particle's mass and radius. Assuming this radius represents a sphere of uniform density we can further determine the particle's volume and density.

e 1: Physical dimensions of a Planck particle
Parameter Dimension Value in SI units
Mass M 3.85763×10−8 kg
Volume L3 7.87827×10−103 m3
Density M L−3 4.89655×1094 kg m-3

It should be noted that the above dimensions do not correspond to any known physical entity or material.

Micro black hole
Planck units
Max Planck
Black hole electron

References

^ Michel M. Deza; Elena Deza. Encyclopedia of Distances. Springer; 1 June 2009. ISBN 978-3-642-00233-5. p. 433.
^ "Light element synthesis in Planck fireballs" - SpringerLink
^ B. Roy Frieden; Robert A. Gatenby. Exploratory data analysis using Fisher information. Springer; 2007. ISBN 978-1-84628-506-6. p. 163.
^ Harrison, Edward Robert (2000), Cosmology: the science of the universe, Cambridge University Press, ISBN 978-0-521-66148-5 p. 424
^ Harrison 2000, p. 478.