Berlin 2015 – scientific programme
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GR: Fachverband Gravitation und Relativitätstheorie
GR 1: Invited Talks 1
GR 1.4: Invited Talk
Monday, March 16, 2015, 11:50–12:30, H 2013
General Relativity as everyday practical tool: time, navigation and geodesy — •Claus Lämmerzahl — ZARM, University of Bremen, Am Fallturm, 28359 Bremen, Germany
The effects of Special and General Relativity are very tiny. For standard everyday velocities the special relativistic Doppler effect is of the order 10−15 and also the gravitational redshift over ten meters height difference is of similar order. The reason for that is the comparatively large velocity of light. However, in the last years we experienced a boost of improvements of experimental accuracy and precision so that today these tiny effects can be measured with high precision. This opens up the possibility to determine precisely the gravitational potential with clocks, distances with laser interferometers and the gravitational field with gravi- and gradiometers based on freely falling masses like atoms. This can be done on ground or from space. In all these different measurement schemes relativity plays an essential part. This talk will highlight these recent and possible future developments and the huge impact they have on Earth sciences including the physics of the ocean, on navigation, positioning, leveling, and metrology.