Talk detail

Participant	Laemmerzahl, Claus
Institution	ZARM, University of Bremen - Am Fallturm - Bremen - Bremen - Germany

Session	PS	Accepted	No	Order		Time
Talk	Oral abstract	Title	Experimental gravitation
Coauthors
Abstract
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Session	PS	Accepted		Order		Time
Talk	Oral abstract	Title	Clocks on ground and in space for fundamental physics and practical applications
Coauthors
Abstract	Time is the most fundamental notion in physics and its precise measurement is of particular importance. Time is the quantity by which the dynamics of physical systems is investigated. Also many physical units like the meter, the kilogram and others in principle can be based on the definition of the second. Recently the measurement of time reached the incredible precision of 10^{-18}. All this makes time an outstanding quantity. In this talk we will review the current technological status of clocks and clock comparison and investigate the potential of such high precision clocks for fundamental tests and practical applications. We review effects on clock comparison due to Special and General Relativity and corresponding tests of these fundamental theories. We will also propose new tests of GR in space. Beside positioning we also describe emerging practical applications like clock geodesy. This proves that General Relativity becomes more and more important for the society.
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Session	PT6	Accepted	Yes	Order	7	Time	17:30	20'
Talk	Oral abstract	Title	Analytic solution of spining particle motion in Kerr space-time
Coauthors	E. Hackmann, Y,N. Obukhov, D. Puetzfeld, I. Schaffer
Abstract	The motion of spinning test bodies in General Relativity is analyzed. By means of a multipolar approximation method for extended test bodies we derive the equations of motion. We specify the motion of the spinning pole-dipole particle to lie in the equatorial plane of a Kerr black hole geometry and completely classify the orbital motion. The analytic solution for this kind of motion is presented. An exact expression for the periastron shift of a spinning test body is given. Implications of test body spin corrections are studied and compared with the results obtained by means of other approximation schemes.
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Session	PT3	Accepted	Yes	Order	1	Time	14:30	15'
Talk	Oral abstract	Title	Summary of Parallel Section PT3 Experimental Gravitation
Coauthors	Claus Laemmerzahl
Abstract	The experiments related to General Relativity (GR) can be divided into three categories: (i) Experiments testing the foundations of GR like the Einstein Equivalence Principle which is basic for establishing the Riemannian structure of space-time describing the gravitational interaction, (ii) experiments related to the structure of the field equations, thus justifying the Einstein field equations, and (iii) experiments and observations confirming the predictions of GR, like the physics of Black Holes. We add a forth group of experiments related to the framework which is needed to describe tests of category (i). Here we experimentally explore the structure of the equations of motion which are used to formalize e.g. the Universality of Free Fall. In this summary we outline this general structure and, thus, link together all the talks of this session in order to obtain a complete picture of Experimental Gravitation. We add reports on applications of GR in Earth sciences, geodesy, positioning and others. These applications also represent daily tests and confirmation of the validity of GR.
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