On perspectives of INTERMAGNET observatories usage for fundamental research in spin-gravitational interactions and cosmology.
V. Sapunov 1, J. Rasson 2, A. Denisov 1, D. Saveliev 1, E. Narkhov 1, B. Rubinstein 3
Quantum magnetometry laboratory of Ural federal university, Mira str. 21, Ekaterinburg, Russia Institut Royal Mуtуorologique Centre de Physique du Globe Rue du Centre de Physique, Belgium Stowers Institute for Medical Research, 1000 East 50th St., Kansas City, MO 64110, USA
The recent LIGO project successful proof of the basic statements of Einstein theory on existence of the gravitational waves was a major motive of this proposal. Similar to magnetic field that appears to be a consequence of the electrical field relativistic transformation under condition of speed of light invariance, experimental proof of the gravitational waves leads to a conclusion of existence of the quasi-magnetic gravitational field initiated by accelerated motion of masses . The extremely high cost of the developed network of the LIGO laser detectors naturally leads to increased attention to alternatives methods for gravitational waves detection based on high precision nuclear magnetometers and theoretically predicted spin-gravitational effects. High precision atomic magnetometers can be used for other fundamental research including spin-gravity coupling, tests of Lorentz and CPT violations, detection of dark matter and dark energy [3-5]. In particular, in  it is discussed a use of so-called comagnetometers made of two scalar magnetometers, for example, built on a pair of nuclear magnetometers, or nuclear (proton) and electron optical quantum magnetometers. The best known application of such devices is high precision gyroscope sensors based on the observation that the proton precession frequency changes significantly due to sensor rotation . A short incomplete list of the requirements to such systems and magnetometers is presented below:
* Minimal possible level of industrial magnetic interferences
* Maximal homogeneity and stability of a weak magnetic field in which the nuclear and electron precession is measured
* Network of spin-gravitational sensors placed at maximal large distances with data transmission to a single data center
* High precision measurement synchronization (for example, using the GPS)
* Long term (multiyear) data accumulation in a single (or cloud) data center with public access for independent processing
* Highly qualified research and management personnel servicing spin-gravitational sensors and data processing of high precision multi-parameter measurements
It is easy to see that these requirements are completely satisfied by the existing network of magnetic observatories INTERMAGNET (including some magnetometer sensor types).