"Absolute hot is a theoretical upper limit to the
thermodynamic temperature scale, conceived as an opposite to
absolute zero.
Contemporary models of
physical cosmology postulate that the highest possible temperature is the
Planck temperature, which has the value 1.416785(71)×1032
kelvins. Above about 1032 K, particle energies become so large that
gravitational forces between them would become as strong as other fundamental forces according to current theories. There is no existing scientific theory for the behavior of matter at these energies. A
quantum theory of gravity would be required. The models of the origin of the universe based on the
Big Bang theory assume that the universe passed through this temperature about 10−42 s (one
Planck time) after the Big Bang as a result of enormous entropy expansion."
Tyson, Peter (2007).
"Absolute Hot: Is there an opposite to absolute zero?". PBS.org.
Archived from the original on 6 August 2009. Retrieved 2009-08-11.
Hubert Reeves (1991).
The Hour of Our Delight. W. H. Freeman Company. p. 117.
ISBN 978-0-7167-2220-5. The point at which our physical theories run into most serious difficulties is that where matter reaches a temperature of approximately 1032 degrees, also known as Planck's temperature. The extreme density of radiation emitted at this temperature creates a disproportionately intense field of gravity. To go even farther back, a
quantum theory of gravity would be necessary, but such a theory has yet to be written.
