Gravity Probe B, launched 20 April 2004, is a space experiment testing two fundamental predictions of Einstein's theory of general relativity (GR), the geodetic and frame-dragging effects, by means of cryogenic gyroscopes in Earth orbit. Data collection started 28 August 2004 and ended 14 August 2005. Analysis of the data from all four gyroscopes results in a geodetic drift rate of -6601.8±18.3 mas/yr and a frame-dragging drift rate of -37.2±7.2 mas/yr, to be compared with the GR predictions of -6606.1 mas/yr and -39.2 mas/yr, respectively ("mas" is milliarcsecond; 1 mas=4.848×10(-9) rad).
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.106.221101 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Primordial black holes and their gravitational-wave signatures.
Living Rev Relativ
January 2025
Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth, PO1 3FX UK.
In the recent years, primordial black holes (PBHs) have emerged as one of the most interesting and hotly debated topics in cosmology. Among other possibilities, PBHs could explain both some of the signals from binary black hole mergers observed in gravitational-wave detectors and an important component of the dark matter in the Universe. Significant progress has been achieved both on the theory side and from the point of view of observations, including new models and more accurate calculations of PBH formation, evolution, clustering, merger rates, as well as new astrophysical and cosmological probes.
View Article and Find Full Text PDFDetermination of Cenozoic Sedimentary Structures Using Integrated Geophysical Surveys: A Case Study in the Hebei Plain, China.
Sensors (Basel)
January 2025
Laboratory of Geophysical EM Probing Technologies, Ministry of Natural Resources, Dongli, Tianjin 300300, China.
The strong multi-stage tectonic movement caused the northwest of the North China Plain to rise and the southeast to fall. The covering layer in the plain area was several kilometers thick. In addition to expensive drilling, it is difficult to obtain deep geological information through traditional geological exploration.
View Article and Find Full Text PDFGreen technologies applied to extraction processes and analysis of polyphenolic compounds from Inga laurina Willd.
Food Chem
January 2025
Department of Food Technology, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil. Electronic address:
This study aimed to identify an efficient and sustainable extraction method for phenolic compounds and flavonoids from I. laurina using maceration (conventional), ultrasonic bath and probes, cup horn sonication, and microwave. It evaluated extraction parameters and assessed total phenolic compounds, flavonoids, antioxidant, and antimicrobial capacities, with annotated compounds via ESI-ToF-MS and the green analytical procedure index analysis.
View Article and Find Full Text PDFBathymetry of the Antarctic continental shelf and ice shelf cavities from circumpolar gravity anomalies and other data.
Sci Rep
January 2025
TUD Dresden University of Technology, Chair of Geodetic Earth System Research, 01062, Dresden, Germany.
Bathymetry critically influences the intrusion of warm Circumpolar Deep Water onto the continental shelf and under ice shelf cavities in Antarctica, thereby forcing ice melting, grounding line retreat, and sea level rise. We present a novel and comprehensive bathymetry of Antarctica that includes all ice shelf cavities and previously unmeasured continental shelf areas. The new bathymetry is based on a 3D inversion of a circumpolar compilation of gravity anomalies constrained by measurements from the International Bathymetric Chart of the Southern Ocean, BedMachine Antarctica, and discrete seafloor measurements from seismic and ocean robotic probes.
View Article and Find Full Text PDFCryogenic front-end circuit for capacitive sensing in superconducting gravimeters.
Rev Sci Instrum
January 2025
Article Synopsis
- Capacitive sensors are essential for superconducting gravimeters due to their precision and minimal drift, prompting the development of a cryogenic front-end circuit to address parasitic capacitance issues.
- The new circuit includes a noiseless superconducting transformer and a low-noise cryogenic preamplifier, significantly boosting the transfer coefficient and reducing displacement noise compared to circuits operating at room temperature.
- Testing of the cryogenic front-end circuit with a superconducting gravimeter showed that the gravity data aligned well with theoretical models, indicating its effectiveness and stability over time.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!