Nuclear and Particle Physics, Astrophysics and Cosmology, T-2

Extra dimensions, orthopositronium decay, and stellar cooling

Alexander Friedland
T-8, LANL

In extensions of the Randall-Sundrum II model, the photon can be localized on the brane by gravity only. An intriguing prediction of these models is the possibility of e+e- annihilation into states living in extra dimensions. The search for this effect has motivated the present round of precision orthopositronium decay experiments. It turns out that in this framework a photon in plasma should also be subject to a similar kind of invisible decay. This has important astrophysical consequences, namely, it changes the plasmon decay rate in globular cluster stars and the core-collapse supernova cooling rate. The resulting bounds on the model parameter exceed the possible reach of orthopositronium experiments by many orders of magnitude.

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