Lightcone fluctuations in quantum gravity and extra dimensions
classification
🌀 gr-qc
astro-phhep-phhep-thquant-ph
keywords
dimensionscompactificationextrafluctuationslightconemodelsourcesanalyze
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We discuss how compactified extra dimensions may have potentially observable effects which grow as the compactification scale decreases. This arises because of lightcone fluctuations in the uncompactified dimensions which can result in the broadening of the spectral lines from distant sources. We analyze this effect in a five dimensional model, and argue that data from gamma ray burst sources require the compactification length to be greater than about $10^5$ cm in this model.
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Cited by 1 Pith paper
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Probabilistic Microcausality in a Thermal Bath of Gravitons
In a thermal state of gravitons at temperature T, metric fluctuations induce a Gaussian spread in the causal structure of a scalar field with Var(x²) = 16 G_N T t³ / 3 after vacuum subtraction.
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