Talk detail

Participant	Werner, Marcus
Institution	YITP, Kyoto University - Kitashirakawa Oiwakecho, Sakyo-ku - Kyoto - Kyoto-fu - Japan

Session	PT2	Accepted	Yes	Order	9	Time	18:35	20'
Talk	Oral abstract	Title	Gravitational Lensing in Area Metric Spacetimes
Coauthors	Schuller, F. P.
Abstract	Recent work in geometrodynamics has shown that predictive gravitational dynamics can be derived from the underlying spacetime kinematics (see session AT5 - Constructive Gravity). On the one hand, this allows modifications of GR due to non-metric spacetime structures to be studied with minimal assumptions; on the other hand, non-metricities give rise to qualitatively new gravitational lensing effects, such as birefringence, whose observational test could then provide strong constraints on such modifications. In this talk, I consider ray optics in area metric geometry and discuss lensing properties for area metric Schwarzschild spacetime in the perturbative regime. This includes effects on magnification and deviations from the standard Etherington distance duality relation.
Pdf file

Session	HR1	Accepted	Yes	Order	6	Time	18:15	25'
Talk	Oral abstract	Title	The Struble-Einstein Correspondence
Coauthors
Abstract	Raimond Struble (1924–2013) was a professor of mathematics at North Carolina State University in Raleigh. In 1947, as a student, he corresponded with Chandrasekhar at Yerkes Observatory and Einstein at the Institute for Advanced Study about the implications of binary star observations for the velocity addition of light, effectively a test of special relativity versus emission theory. Struble pointed out that there is an acceleration effect hitherto overlooked in tests of emission theory. In this talk, I discuss the scientific context of this `Struble effect' and the contents of this privately held, unpublished Einstein correspondence.
Pdf file