Constraints on Extra-Dimensions and Variable Constants from Cosmological Gamma-Ray Bursts

  title={Constraints on Extra-Dimensions and Variable Constants from Cosmological Gamma-Ray Bursts},
  author={Tiberiu Harko and K. S. Cheng},
  journal={Astrophysics and Space Science},
The observation of the time delay between the soft emission and the high-energy radiation from cosmological gamma ray bursts can be used as an important observational test of multi-dimensional physical theories. The main source of the time delay is the variation of the electromagnetic coupling, due to dimensional reduction, which induces an energy dependence of the speed of light. For photons with energies around 1 TeV, the time delay could range from a few seconds in the case of Kaluza–Klein… 
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