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Time variation of fundamental constants, primordial nucleosynthesis, and the size of extra dimensions

Edward W. Kolb

Malcolm J. Perry

T. P. Walker

  • Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510 and Astronomy and Astrophysics Center, University of Chicago, Chicago, Illinois 60637

  • Department of Physics, Princeton University, Princeton, New Jersey 08544 and Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, United Kingdom

  • Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510 and Department of Astronomy, Indiana University, Bloomington, Indiana 47405

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Phys. Rev. D 33, 869 – Published 15 February, 1986

DOI: https://doi.org/10.1103/PhysRevD.33.869

Abstract

In theories with extra dimensions, the dependence of fundamental constants on the volume of the compact space allows one to use primordial nucleosynthesis to probe the structure of compact dimensions during the first few minutes after the big bang. Requiring the yield of primordial sup4He to be within acceptable limits, we find that in ten-dimensional superstring models the size of the extra dimensions during primordial nucleosynthesis must have been within 0.5% of their current value, while in Kaluza-Klein models the extra dimensions must have been within 1% of their current value.

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Comments & Replies

Comment on ‘‘Time variation of fundamental constants, primordial nucleosynthesis, and the size of extra dimensions.’’

Pushpa Khare
Phys. Rev. D 34, 1936 (1986)

References (9)

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  8. In Kaluza-Klein models gauge couplings depend upon different radii, and in principle, it is possible to distort the space to give different changes in different gauge couplings. For simplicity, we will assume all radii are the same.
  9. See, e.g., Y. Yang, M. S. Turner, G. Steigman, D. N. Schramm and K. A. Olive, Astrophys. J. 281, 493 (1984).

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Phys. Rev. D 33, 869– Published 15 February, 1986
  • Received 23 September 1985

© 1986 American Physical Society

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