Conveners
Experimental graviation: Monday block 1
- Hansjoerg Dittus (University of Bremen)
- Claus Laemmerzahl (University of Bremen)
Experimental graviation: Monday block 2
- Claus Laemmerzahl (University of Bremen)
- Hansjoerg Dittus (University of Bremen)
Description
General Relativity is still the best tested fundamental theory of
physics. This theory determines our understanding of space and time.
Nevertheless, there are a series of inconsistencies and so far
unexplained phenomena with respect to quantum theories that it is
mandatory to test and to explore General Relativity as hard as possible.
This session is about testing the foundations as encoded in the Newton
axioms and in the Einstein Equivalence Principle as well as about the
consequences of General Relativity for laboratory and space tests. The
session addresses classical as well as quantum tests.
This work introduces the experimental progress of the measurement of gravitational constant G at Huazhong University of Science and Technology. We intend to carry out the measurement with the silicon spheres. The surface separation between the spheres is measured with the laser interferometry with an uncertainty of less than 0.1 um. The expected uncertainty of G is better than 10ppm.
The Preferred Frame Effects (PFE), in the framework of the Parametrized-Post Newtonian (PPN) formalism, valid in the weak-field and slow-motion (WFSM) limit of General Relativity (GR), are described by the three parameters α1, α2 and α3, all equal to zero in GR and in tensor-scalar theories of gravity. A test of PFE is equivalent to a test of Local Lorentz Invariance (LLI), which represents a...
The Newtonian law of non-relativistic gravity has been tested in many laboratory experiments with very high precision. In contrast, the gravitational field of ultra-relativistic matter, dominated by kinetic energy and stresses, has not been measured directly. I will examine the gravitational field of moving source masses in general relativity and scalar-tensor theory. The latter serves as an...
In hierarchical triple systems, the inner binary can be considered as a rotating matter ring with respect to the distant, outer companion. As such, the orbital angular momentum of the former induces an own gravitomagnetic field which may be orders of magnitude larger than that due to the individual spin angular momenta of the binary's components.The resulting gravitomagnetic orbital...
Nano-electromechanical systems (NEMS), electrostatically driven at their resonance frequency and parametrically pumped by time-dependent dispersion forces, are theoretically expected to display remarkable gain, sensitivity, resolution, and tunability properties. This author previously discussed employing nanodevices of this novel class as sensors to measure non-gravitational accelerations in...
The quantization of gravity is widely believed to result in gravitons -- particles of discrete energy that form gravitational waves. But their detection has so far been considered impossible, in particular Dyson recently analysed whether observing single graviton exchange between matter and gravitational waves is even possible in principle. Here we show that single graviton exchange can be...
Large frame Ring Laser Gyroscopes which operate based on the Sagnac effect, are highly sensitive instruments used to measure angular velocity relative to fixed stars. The GINGER (Gyroscopes IN GEneral Relativity) project plans to build an array of three large Ring Laser Gyroscopes, firmly attached to the Earth. GINGER aims to detect General Relativity effects and potential Lorentz Violation in...
