Conveners
Recorder Talks: Geodesy and Ranging
- Jürgen Müller (chair)
A strong candidate for the Next Generation Gravity Mission (NGGM) is a mission like GRACE Follow-On, with laser interferometry measurements between the two satellites, but with a much lower non-gravitational acceleration noise level requirement for the satellites. That level could be reduced to below 1x10-12 m/(s2)/(Hz0.5) from 0.3 mHz to 1 Hz by making use of a much simplified version of the...
The advancement of quantum technology brings new opportunities in precision measurements, which yields novel sensors for accelerometry, gradiometry, chronometry and so on. For chronometry, high-performance clock networks, i.e., optical clocks connected by dedicated frequency transfer techniques, are capable to observe the gravitational redshift effect. This can be applied to infer the...
In the past decades, Earth’s geoid has been successfully measured by the GOCE and GRACE missions. The usual data analysis consists in making a spherical harmonic expansion of the measured gravity field, which nonetheless restricts to the case of Newtonian gravity in published works.
In this talk, I will present the impact of considering a finite coupling scale Yukawa deviation to a Newtonian...
From 1969 on, Lunar Laser Ranging data are collected by various observatories and analyzed by different analysis groups. In the past years observations with larger telescopes (APOLLO) and at infrared frequencies (OCA, Wettzell) are carried out, which resulted in a better spread of precise LLR data over the lunar orbit and the observed reflectors on the Moon. In Germany, from the early 80ies...
We will present an overview including recent results obtained with the INPOP planetary ephemerides. Classic PPN tests as well as graviton constraints obtained with planetary orbits will be presented as well as tests of the equivalence tests deduced from the construction of lunar ephemeris.
Every space mission requires extensive testing campaigns to validate the crucial
technological aspects and ensure that the key science objectives are achieved.
In our laboratory, torsion pendulums have been successfully employed to design and test the
technology for the LISA Pathfinder mission, in particular regarding the performance
of the Gravitational Reference Sensor...
Matter-wave interferometers with ultracold atoms are highly sensitive to inertial quantities. In the Hannover Very Long Baseline Atom Interferometry (VLBAI) facility, we aim to exploit the linear scaling of this sensitivity with the free fall time of the atoms in a 10 m baseline[1]. This will enable precision measurements of gravitational acceleration, as well as tests of the weak equivalence...
Owing to new highly sensitive devices like clocks, freely falling particles, spinning tops, and laser and atom interferometers on ground and in space the relativistic gravitational field of the Earth can now be measured with unprecedented accuracy. This requires a relativistic formulation of geodesy. Here a fully general relativistic scheme for geodesy is presented. Starting from stationarity...
MOCAST+ (MOnitoring mass variations by Cold Atom Sensors and Time measures) is an on-going study of a quantum technology mission for the gravity field mapping to monitor mass transport and mass variations above and below the Earth surface. The study, which is the continuation of the MOCASS project, is jointly carried out by several Italian research groups and is funded by the Italian Space...
Gravitational waves have recently been detected on the LIGO-VIRGO interferometers [1]. The gravitational waves predicted by Einstein 100 years ago [2], have become a reality and a new astronomy is emerging. We will discuss the possibility of producing gravitational waves using high power laser beams, during laser-matter interaction, and with the laser light only.
The search for gravitational...
We are building a large-scale gravity antenna, MIGA [1], demonstrator for low frequency Gravitational Waves (GW) detection based on atom interferometry. This new infrastructure will be embedded into the LSBB underground laboratory, ideally located away from major anthropogenic disturbances and benefitting from very low background noise. MIGA will provide precise measurements of the local...
