额外维度、正电子偶素衰变和恒星冷却
Extra dimensions, orthopositronium decay, and stellar cooling
摘要：
在一类具有扭曲度规和单膜的额外维模型中，光子只能通过引力定域在膜上。这些模型的一个有趣的特征是光子逃逸到额外维度的可能性。对这种效应的探索激发了目前这一轮精确的正电子偶素衰变实验。我们指出，在这个框架中，光子在等离子体中应该是亚稳态的。我们认为这一观测结果的天体物理后果，特别是它意味着在球状星团的等离子体衰变率和核心坍缩超新星冷却率。由此产生的模型参数的界限超过了可能达到的正电子偶素实验的许多数量级。
英文摘要：
In a class of extra dimensional models with a warped metric and a single brane the photon can be localized on the brane by gravity only. An intriguing feature of these models is the possibility of the photon escaping into the extra dimensions. The search for this effect has motivated the present round of precision orthopositronium decay experiments. We point out that in this framework a photon in plasma should be metastable. We consider the astrophysical consequences of this observation, in particular, what it implies for the plasmon decay rate in globular cluster stars and for 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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