Vadim Milyukov

Vadim Milyukov
Lomonosov Moscow State University | MSU · Sternberg Astronomical Institute

Doctor of Sciences

About

118
Publications
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Publications

Publications (118)
Article
We investigate displacement measurements of up to 17 μm on a heterodyne laser interferometer laboratory model. The measurement error for small (up to 200 nm) linear displacements is found to be 270 pm at a 10-s averaging time. The results obtained can be used for developing a space laser interferometric system for the global Earth?s gravity field m...
Preprint
TianQin is a planned space-based gravitational wave (GW) observatory consisting of three earth orbiting satellites with an orbital radius of about $10^5~{\rm km}$. The satellites will form a equilateral triangle constellation the plane of which is nearly perpendicular to the ecliptic plane. TianQin aims to detect GWs between $10^{-4}~{\rm Hz}$ and...
Article
Full-text available
TianQin is a planned space-based gravitational wave (GW) observatory consisting of three Earth-orbiting satellites with an orbital radius of about $10^5 \, {\rm km}$. The satellites will form an equilateral triangle constellation the plane of which is nearly perpendicular to the ecliptic plane. TianQin aims to detect GWs between $10^{-4} \, {\rm Hz...
Article
The theory of relativistic reductions for future challenges of space gravimetry with target accuracy of up to 1 picometer is developed in this paper.
Article
Full-text available
Analysis of GPS-measurements made for the first time along the geodesic profile crossing all the main geological structures in the Ossetian region of the Greater Caucasus showed that significant jumps in the velocity of horizontal movements are observed in zones where strong earthquakes recently occurred. Interpretation of the measurement data is p...
Article
The free core nutation (FCN) is one of the Earth’s rotational eigenmodes, which is caused by the retrograde motion of the liquid core relative to the mantle. The FCN period and Q-factor are determined by the elastic properties of the core/mantle boundary (CMB) and their electromagnetic interaction. In the celestial coordinate system, the FCN period...
Article
The advancement of space technology opens new perspectives in developing high-resolution models of the Earth’s gravitational field. The use of a precision laser interferometric system requires taking relativistic effects in the inter-satellite ranging within the satellite constellation into account. The main quantity measured by the laser system is...
Article
The Slichter mode (1S1) is the longest-period mode of Earth’s free oscillations. The period of this mode depends on the difference between the densities of the outer liquid and inner solid cores, thus making its detection very important for the refinement of models of the Earth. Despite numerous attempts at detecting this mode with the use of a net...
Chapter
The Elbrus volcanic center is located in southern Russia on the northern slope of the main ridge of the Greater Caucasus. Current classifications define Elbrus as a dormant volcano that could become active even after millennia of quiescence. In this study, we use two new geophysical methods to assess the contemporary state of the Elbrus volcano. Th...
Article
Based on the deformation data measured by the Baksan laser interferometer-strainmeter, Earth’s free oscillations (EFO) excited by the Okhotsk Sea deep-focus earthquake of May 24, 2013, the largest recorded deep-focus earthquake, are analyzed. The periods of 50 fundamental modes of EFO in the range 1.2–5.0 mHz are determined with an error of 3–12 μH...
Article
Full-text available
The Newtonian gravitational constant, G, is one of the most fundamental constants of nature, but we still do not have an accurate value for it. Despite two centuries of experimental effort, the value of G remains the least precisely known of the fundamental constants. A discrepancy of up to 0.05 per cent in recent determinations of G suggests that...
Article
Full-text available
The results of the first GPS measurements along the geophysical profile that intersects all major geological structures of the Osetiya region of the Greater Caucasus are presented. The results of the measurements are interpreted in comparison with those of neotectonic studies and data on the deep structure.
Article
Full-text available
Представлены результаты выполненных впервые GPS-измерений вдоль геодезического профиля, пересекающего все основные геологические структуры в Осетинском регионе Большого Кавказа. Интерпретация результатов измерений выполнена в сопоставлении с результатами неотектонических исследований и данными о глубинном строении.
Article
Full-text available
The Elbrus volcanic center is located in southern Russia on the northern slope of the main ridge of the Greater Caucasus. Current classifications define Elbrus as a dormant volcano that could become active even after millennia of quiescence. In this study, we use two new geophysical methods to assess the contemporary state of the Elbrus volcano. Th...
Article
Reliable use of strain data in geophysical studies requires their preliminary correction for ocean loading and various local distortions. These effects, in turn, can be estimated from the tidal records which are contributed by solid and oceanic loading. In this work, we estimate the oceanic tidal loading at two European strain stations (Baksan, Rus...
Article
Full-text available
This review considers the problem of autonomously determining the position of a spacecraft in space based on the analysis of pulses emitted by X-ray pulsars. The characteristics of the prospective equipment and lists of pulsar candidates for reference sources are given. The navigation algorithm and resulting accuracy characteristics are substantiat...
Article
Full-text available
A geodetic network of Global Satellite Navigation System (GNSS) observation sites was organized in 2014–2015 for studying the contemporary crustal motions in the zone of the Vladikavkaz deep fault (Milyukov et al., 2014; 2015). The measurements were conducted and the first velocity estimates obtained testifying to the consistency of crustal motions...
Article
In the measurement of the gravitational constant G with angular acceleration method, the equilibrium position of torsion pendulum with tungsten fiber undergoes a linear slow drift, which results in a quadratic slow drift on the angular velocity of the torsion balance turntable under feedback control unit. The accurate amplitude determination of the...
Article
The free oscillations of the Earth excited by one of the strongest earthquakes of the past decade (Japan, 2011) are analyzed using strain data obtained with precision laser interferometer-strain meters located in the North Caucasus (near Elbrus) and in Crimea (Sevastopol). Theoretical (PREM model) and observed oscillatory modes (North Caucasus) are...
Article
Full-text available
TianQin is a proposal for a space-borne detector of gravitational waves in the millihertz frequencies. The experiment relies on a constellation of three drag-free spacecraft orbiting the Earth. Inter-spacecraft laser interferometry is used to monitor the distances between the test masses. The experiment is designed to be capable of detecting a sign...
Article
Full-text available
The Greater Caucasus overall and its Ossetian segment are parts of the neotectonically active Alpine-Himalaya mobile belt. This region, complex from the geodynamical standpoint, is traditionally treated as resulting from interaction between two large lithospheric plates, the Eurasian and Arabian ones. In 2010, a geodetic network for periodical repe...
Conference Paper
We present here the concept for a new experimental test of the Weak Equivalence Principle (WEP) carried out in the gravity field of the Sun. In this experiment, two test masses of different materials are the central elements of a differential accelerometer with zero baseline. The differential accelerometer is placed on a pendulum, in such a way as...
Article
Full-text available
The velocity field of the Northern Caucasus based on the results of observations at the Northern Caucasus Geodetic Network (NCGN) stations is represented in the paper. Appreciable horizontal displacement to the northeast with velocity of 26-28 mm/yr relative to the International Terrestrial Reference Frame (ITRF2008) is established. General shorten...
Article
Full-text available
Based on the deformation data provided by the Baksan laser interferometer-strainmeter measurements, the free oscillations of the Earth (FOE) excited by the three strongest earthquakes of the past decade are analyzed. These seismic events include the Great Sumatra-Andaman earthquake that occurred in 2004 in the Indian Ocean, the Mauli earthquake of...
Article
Full-text available
This paper describes the preliminary measurement of the Newtonian gravitational constant G with the angular acceleration feedback method at HUST. The apparatus has been built, and preliminary measurement performed, to test all aspects of the experimental design, particularly the feedback function, which was recently discussed in detail by Quan et a...
Article
Full-text available
We review the G measurements with time-of-swing method at HUST. Two independent experiments have been completed and an improved experiment is in progress. The first G value was determined as 6.6699(7)×10(-11) m(3) kg(-1) s(-2) with a relative standard uncertainty (ur) of 105 ppm by using a long period torsion pendulum and two cylindrical source mas...
Article
Full-text available
Measurements of the absolute acceleration of gravity g at seven sites in the Northern Caucasus region which form a reference network for gravimetric monitoring of vertical movements of the region are reported. A method based on measuring Δg between new and the reference sites with a high-precision relative gravimeter has been developed for extendin...
Article
Questions related to expressing the influence of meteorological factors in the measurement of lithosphere deformations by means of a Baksan laser strain meter interferometer situated in an underground adit subject to active ventilation are considered. Features of the behavior of temperature and atmospheric pressure under these conditions are identi...
Article
Full-text available
Measurements of G, the Newtonian constant of gravitation, in laboratory experiments have a more than two hundred years’ history. Although the accuracy of the best modern experimental measurements of G reaches 15–40 ppm, the scatter of the measured values is large enough, and the knowledge of the absolute value of G is still rather poor. The results...
Article
The Elbrus volcanic center is located on the northern slope of the main ridge of the Greater Caucasus. It includes Mount Elbrus, a double-top stratovolcano, and a number of small volcanic centers concentrated on its western flank. According to present understandings, the Elbrus volcano falls into the category of the so-called dormant volcanoes that...
Article
Strain data recorded by two laser interferometer-strainmeters operating in the Baksan (Northern Caucasus, Russia) and Gran Sasso (Italy) underground observatories, and the length-of-day (LOD) data describing the variable rate of the Earth's rotation are used to study the relation between the deformation processes in the lithosphere and the global g...
Article
The results of six years of continuous observations of deformations (strains) of the Earth’s crust and of the accompanying metrological parameters carried out using a high-precision long-base laser interferometerdeformograph are presented. The position of the laser interferometer in the Baksan neutrino observatory (North Caucasus) in an underground...
Article
Full-text available
The series of observations conducted at the Baksan and Protvino deformation stations in the Northern Caucasus and the Central Russian Plain, respectively, and the length-of-day (LOD) data describing the variable rate of the Earth’s rotation are used to study the relation between the deformation processes in the lithosphere and the global geodynamic...
Article
Full-text available
The northern part of the Greater Caucasus is one of the most geodynamically active regions of Russia. This is a zone of complex tectonics resulting from interaction between two of the Earth's major lithospheric plates, Arabia and Eurasia. Therefore, the region as a whole is characterized by a complex system of faults, with meridional and diagonal s...
Article
The question of the global mechanism influencing state of the Lithosphere and probably being trigger for the strongest earthquakes is discussed. As one of possible mechanisms, we had been considered geodynamic rotational model in which processes of redistribution of the stress-strain state of earth crust are classified as reaction of the angular mo...
Article
Due to the weakness of gravity, the accuracy of the Newtonian gravitational constant G is essentially below the accuracy of other fundamental constants. The current value of G, recommended by CODATA in 2006, based on all results available at the end of 2006, is G = (6.67428 ± 0.00067) × 10-11 m3kg-1s-2 with a relative error of 100 ppm. The modern h...
Article
The results of long-term monitoring of crustal deformations in the Northern Caucasus using a high precision long base laser strainmeter and the GPS/GLONASS network are presented. The Baksan laser interferometer–strainmeter with a measuring arm length of 75m and resolution of 2.3×10−13 is mounted inside an underground gallery in a mountainous area n...
Article
Full-text available
A new concept gravity meter with sensitivity close to Hz ms / 10 2 8 ? ? in the range of 10 -5 ?1Hz intended for observation of the vertical component of the Earth gravity and teleseismic waves was implemented at the Istituto di Fisica dello Spazio Interplanetario (IFSI), CNR and successfully operated during the GEOSTAR-2 mission. The gravimeter ha...
Article
Full-text available
The motion of a torsion balance with five degrees of freedom has been numerically simulated. It has been shown that the oscillations along the swing degrees of freedom are excited by the random noise of the seismic origin and their amplitude varies with time. It has been shown also that the nonlinear couplings between the swing and torsion degrees...
Article
The northern part of the Greater Caucasus is one of the most geodynamically active regions of Russia. From the standpoint of modern geodynamics, the features of this region are a typical example of collision tectonics resulting from interaction between Scythian plate and Alpine-Himalaya tectonic belt. The GPS observations in the Northern Caucasus a...
Article
Full-text available
The question of the global mechanism influencing state of the Lithosphere and probably being trigger for the strongest earthquakes is discussed. As one of possible mechanisms, we had been considered geodynamic rotational model in which processes of redistribution of the stress-strain state of earth crust, including places of preparation of seismic...
Article
Full-text available
“Galileo Galilei” (GG) is a small satellite designed to fly in low Earth orbit with the goal of testing the Equivalence Principle—which is at the basis of the General Theory of Relativity—to 1 part in 1017. If successful, it would improve current laboratory results by 4 orders of magnitude. A confirmation would strongly constrain theories; proof of...
Article
Full-text available
"Galileo Galilei" (GG) is a small satellite designed to fly in low Eath orbit with the goal of testing the Equivalence Principle - which is at teh basis of the General Theory of Relativity - to 1 part in 10^17. If successfull, it would improve current laboratory results by 4 order of magnitudes. A confirmation would strongly constrain theories; pro...
Article
Full-text available
Due to weakness of gravity, the accuracy of the Newtonian gravitational constant G is essentially below the accuracy of other fundamental constants. The current value of G, recommended by CODATA in 2006, based on all results available at the end of 2006, is G = (6.67428 ± 0.00067) × 10−11 m3 kg−1 s−2 with a relative error of 100 ppm. New experiment...
Article
Full-text available
The density inhomogeneity of a glass pendulum is determined by an optical interference method. The relative variations of the densities over a volume with sizes of 5 × 5 × 5 mm3 are (0.64 ± 0.97) × 10−5 and (0.99 ± 0.92) × 10−5 for the K9 glass and silica glass pendulum, respectively. These variations of densities contributing to the relative uncer...
Article
The Newtonian gravitational constant G together with Planck's constant h and the speed of light c are the fundamental constants of nature. Due to the weakness of gravity the accuracy of G is essentially below the accuracy of other fundamental constants. New measurements on the accuracy level of 10-30 ppm are rather desirable. The history and curren...
Article
Progresses in the development of a free-fall test of the Principle of Equivalence (PE) are reported with particular emphasis on the work related to development of the differential accelerometer prototype and its laboratory tests. The PE experiment is planned to be carried out in free-fall conditions, inside a capsule (Einstein elevator) released fr...
Article
This paper concerns observations made by a broadband deep-sea gravimeter installed on the plat-form of the SN-1 multiparameter seafloor observatory. The observatory was deployed at a distance of 25 km from the east coast of Sicily in southern Italy at a depth of 2105 m and was operated in a self-contained mode from October 2002 to February 2003 (13...
Article
An analysis of crustal strain recorded by the Baksan laser interferometer revealed a shallow magma chamber in the structure of Elbrus Volcano (The Northern Caucasus, Russia). The analysis is based on estimation of parameters of magmatic structures resonant modes excited by teleseismic signals. The resonance parameters we have found were interpreted...
Article
The coupling of the swing modes of a torsion pendulum to the torsional mode has been solved analytically. Our solution provides a clear explanation of why a magnetic damper is effective in suppressing unwanted modes in most gravitational experiments. The analytic solution also shows that the amplitude of the mode coupling is greatest at the lowest...
Article
Full-text available
Due to the weakness of gravity, the accuracy of the Newtonian gravitational constant G is essentially below the accuracy of other fundamental constants. The current value of G, recommended by CODATA in 2006, based on all results available at the end of 2006, is G = (6.67428 ± 0.00067) × 10−11 m3 kg−1 s−2 with a relative error of 100 ppm. The accura...
Article
The last decade has seen a renewed interest for the exploration of our natural satellite, the Moon. This interest is expected to grow in the foreseeable future, also in view of new manned missions. The scientific reasons for lunar exploration are well-justified, in particular there is space for improved models of its gravitational field: these mode...
Article
Full-text available
The ESA BepiColombo mission, for the exploration of planet Mercury, is scheduled for launch in 2013 with a two-satellite configuration. Among the main scientific objectives of this mission are the gravimetry and rotation of Mercury and tests of Einstein's theory of general relativity, to be achieved by the MPO (Mercury Planetary Orbiter) satellite....
Article
Results of observations of tidal strains of the crust in the tectonically active region of the Northern Caucasus (the Elbrus mountain area) carried out with the use of the Baksan laser interferometer strainmeter over the period from 2003 through 2006 are presented. Harmonic analysis is performed with the help of the ETERNA software package. Statist...
Article
Full-text available
Results of observations of tidal strains of the crust in the tectonically active Elbrus area of the Northern Caucasus carried out with the use of the Baksan SSAI laser interferometer strainmeter over the period from 2003 through 2006 are presented. Harmonic analysis is performed with the help of the ETERNA software package. Statistically significan...