Testing a (stringy) model of Quantum Gravity

Research output: Chapter in Book/Report/Conference proceedingConference paper


I discuss a specific model of space-time foam, inspired by the modern nonperturbative approach to string theory (D-branes). The model views our world as a three brane, intersecting with D-particles that represent stringy quantum gravity effects, which can be real or virtual. In this picture, matter is represented generically by (closed or open) strings on the D3 brane propagating in such a background. Scattering of the (matter) strings off the D-particles causes recoil of the latter, which in turn results in a distortion of the surrounding space-time fluid and the formation of (microscopic, i.e. Planckian size) horizons around the defects. As a mean-field result, the dispersion relation of the various particle excitations is modified, leading to non-trivial optical properties of the space time, for instance a non-trivial refractive index for the case of photons or other massless probes. Such models make falsifiable predictions, that may be tested experimentally in the foreseeable future. I describe a few such tests, ranging from observations of light from distant gamma-ray-bursters and ultra high energy cosmic rays, to tests using gravity-wave interferometric devices and terrestrial particle physics experiments involving, for instance, neutral kaons.
Original languageEnglish
Title of host publicationUnknown
Place of PublicationBERLIN
Pages209 - 233
Number of pages25
ISBN (Print)3-540-41797-4
Publication statusPublished - 2001
Event3rd International Conference on Dark Matter in Astro-and Particle Physics (DARK 2000) - HEIDELBERG, Germany
Duration: 1 Jan 2001 → …


Conference3rd International Conference on Dark Matter in Astro-and Particle Physics (DARK 2000)
Period1/01/2001 → …


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