Talk detail

Participant	Pfeifer, Christian
Institution	Laboratory of theoretical physics, University of Tartu - Wilhelm Ostwaldi 1 - Tartu - Tartu - Estonia

Session	QG2	Accepted	Yes	Order	3	Time	16:15	30'
Talk	Oral abstract	Title	Observables from modified dispersion relations on curved spacetimes: circular orbits, redshift and lateshift
Coauthors	Barcaroli, L; Brunkhorst, L.; Gubitosi, G.; Loret, N.
Abstract	The Hamiltonian formulation of modified dispersion relations allows for their implementation on generic curved spacetimes. In turn it is possible to derive phenomenological effects. In this talk I will present how to construct the kappa-Poincare dispersion relation on curved spacetimes, its spherically symmetric realization: the kappa-Poincare deformation of Schwarzschild spacetime and the general first order modification of the general relativistic Friedmann-Lemaitre-Robertson-Walker dispersion relation. For the spherically symmetric case observables such as the innermost circular orbits and the redshift of photons will be derived. For the FLRW case we find the general red- and lateshift formula. Observations on the shadows of black holes and time of arrival of high energetic gamma-rays and neutrinos are capable of finding evidence or constraints for the modified dispersion relations under consideration.
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Session	AT5	Accepted	Yes	Order	11	Time	18:30	15'
Talk	Oral abstract	Title	Observers' measurements of time and length in premetric electrodynamics
Coauthors	GÃ¼rlebeck, N.
Abstract	The notion of observers' and their measurements is closely tied to the Lorentzian metric geometry of spacetime, which in turn has its roots in the symmetries of Maxwell's theory of electrodynamics. Modifying either the one, the other or both ingredients to our modern understanding of physics requires also a reformulation of the observer model used. In this talk we will consider a generalized theory of electrodynamics, so called local and linear premetric, or area metric, electrodynamics and the spactime structures it implies. On this basis we will describe an observer's measurement of time and spatial length. A general algorithm how to determine observer measurements will be outlined and explicitly applied to a first order premetric perturbation of Maxwell electrodynamics. The latter contains for example the photon sector of the minimal standard model extension. Having understood an observerâ€™s measurement of time and length we will derive the relativistic observables time dilation and length contraction. In the future a modern relativistic description of the classical test of special relativity shall be performed, including a consistent observer model.
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