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Atick, J.J. and Witten, E. (1988) The Hagedorn Transition and the Number of Degrees of Freedom of String Theory. Nuclear Physics B, 310, 291-334.
https://doi.org/10.1016/0550-3213(88)90151-4

has been cited by the following article:

• TITLE: An Interesting Mathematical Relation between the Proton Mass, the Proton Radius, the Fine Structure Constant, the Compton Wavelength and the Hagedorn Temperature

  AUTHORS: Espen Gaarder Haug

  KEYWORDS: Proton Radius, Fine Structure Constant, Proton Mass, Reduced Compton Wavelength

  JOURNAL NAME: Journal of High Energy Physics, Gravitation and Cosmology, Vol.5 No.2, March 20, 2019

  ABSTRACT: In this short note we present a possible connection between the proton radius and the proton mass using the fine structure constant. The Hagedorn temperature is related to the energy levels assumed to be required to free the quarks from the proton, where hadronic matter is unstable. We also speculate that there could be a connection between the Hagedorn temperature and the Planck temperature through the fine structure constant. Regarding whether or not there is something to this (or if it is purely a coincidence), we will leave to others and future research to explore. However, we think these possible relationships are worth further investigation.