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The University of Southampton
STAG Research Centre

AstroGrav pizza lunch - Dimitrios Emmanoulopoulos Seminar

12:00 - 13:00
4 February 2014
Building 46, seminar room (5th floor)

For more information regarding this seminar, please email Rene Breton at .

Event details

Quantum gravity studies from an astrophysical perspective

Discussion group meeting

Einstein postulated that "Light always propagates through a vacuum at a definite velocity, c, which is independent of the state of motion of the emitting body". This is the framework of classical special relativity, having no fundamental length-scale associated with it (Lorentz invariance). However, quantum effects at the Planck scale, where gravity becomes a strong force, are expected (although not yet proven) to strongly affect the nature of space-time, causing violations of this invariance. It is believed that such violations can be tested by measuring time-lags between very high energy (VHE: > few GeV) photons, emitted simultaneously from distant astrophysical sources, expressing possible variations of photon speed as a function of energy. Since blazars (i.e. VHE emitting AGN) are in relatively cosmological distances and emit variable emission in VHE they are considered ideal candidates to test such deviations. I will describe the current astrophysical detection techniques, involving ground based and space-borne detectors, and then I will present the latest results.

Speaker information

Dimitrios Emmanoulopoulos,Southampton

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