A high frequency resonance gravity gradiometer

Багаев, С. Н.; Bezrukov, L.; Kvashnin, N. L.; Krysanov, V. A.; Oreshkin, S. I.; Motylev, A. M.; Попов, С. М.; Rudenko, V. N.; Samoǐlenko, A. A.; Skvortsov, M. A.; Yudin, I. S.

doi:10.1063/1.4883901

Cited by 13 publications

(8 citation statements)

References 21 publications

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“…It was shown that readout noises can be reduced to this level and even more if one will use the laser pump with 100 W instead of 1 W as it was taken in our estimates. The reason of considering such variant of modernization lays of course in a realistic view on a reconstruction of the existing OGRAN chamber [1,2] into nitrogen cryostat. For helium cryostat version it will require a construction of completely new setup very expensive in creation and exploiting [4,5].…”

Section: Discussionmentioning

confidence: 99%

“…The "read out" arm of the OGRAN setup containing the discriminator cavity remains under room temperature. In general, a variation of the optical resonator length l leads to the change of the resonance frequency ν according to the simple relation ∆ν = (∆l/l)·ν, i.e., the effect is stronger for the shorter resonator (in the OGRAN setup, L=2 m and l=50 cm [1,2]). On the other hand, a discrimination of the frequency shifts will be better with a narrow resonator bandwidth.…”

Section: Ogran Read Out Arm and Influence Of Discriminator Noisesmentioning

confidence: 99%

“…OGRAN was developed and constructed by collaboration of Moscow State University (Sternberg Astronomical Institute, SAI MSU) and Russian Academy of Sciences (Institute of Nuclear Research, INR RAS, and Institute of Laser Physics, ILP SB RAS). Detailed description of this antenna was given in [1,2]. At present the antenna OGRAN is installed in underground facilities of the Baksan Neutrino Observatory of INR RAS and is going on through a commission stage.…”

Section: Introductionmentioning

confidence: 99%

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Opto-acoustical gravitational bar detector with cryogenic mirrors

et al. 2016

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Abstract. Enhancing of sensitivity of the opto-acoustical gravitational wave (GW) antenna OGRAN installed in the underground facilities of Baksan Neutrino Observatory is analyzed. Calculations are presented showing a sensitivity improving on two orders of value after a cooling the solid body acoustical part of the antenna to the nitrogen temperature. A possibility of keeping of the same optical scheme of the antenna at low temperature is discussed. Design of modernized construction for cryogenic version of the antenna OGRAN is described. Test experiments with cooled pilot model carrying cryogenic mirrors illuminated by the optical pump up to 0.5 W are presented.

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Section: Discussionmentioning

confidence: 99%

Section: Ogran Read Out Arm and Influence Of Discriminator Noisesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Opto-acoustical gravitational bar detector with cryogenic mirrors

et al. 2016

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“…The deviation from the inhomogeneity are of the post-Newtonian order of magnitude, δρ/ρ GM ⊕ /c 2 R ⊕ 7 × 10 −10 , and are practically unmeasurable in local experiments. Nonetheless, the relativistic effects in the normal gravity field produced by such a density inhomogeneity over the global scale might be noticed in precise measurements of the gravity field conducted with the next generation of gravimeters [57,58] and/or gravity gradientometers [59][60][61]. Thus, we again has to compromise between two models of the Earth's interior -a non-homogeneous density distribution of matter inside a reference level ellipsoid or a homogeneous density with the small, post-Newtonian deviations of the reference level surface from the precise ellipsoid of revolution.…”

Section: Post-newtonian Metricmentioning

confidence: 99%

Post-Newtonian reference ellipsoid for relativistic geodesy

2016

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We apply general relativity to construct the post-Newtonian background manifold that serves as a reference spacetime in relativistic geodesy for conducting relativistic calculation of the geoid's undulation and the deflection of the plumb line from the vertical. We chose an axisymmetric ellipsoidal body made up of perfect homogeneous fluid uniformly rotating around a fixed axis, as a source generating the reference geometry of the background manifold through Einstein's equations. We, then, reformulate and extend hydrodynamic calculations of rotating fluids done by a number of previous researchers for astrophysical applications to the realm of relativistic geodesy to set up algebraic equations defining the shape of the post-Newtonian reference ellipsoid. To complete this task, we explicitly perform all integrals characterizing gravitational field potentials inside the fluid body and represent them in terms of the elementary functions depending on the eccentricity of the ellipsoid. We fully explore the coordinate (gauge) freedom of the equations describing the post-Newtonian ellipsoid and demonstrate that the fractional deviation of the post-Newtonian level surface from the Maclaurin ellipsoid can be made much smaller than the previously anticipated estimate based on the astrophysical application of the coordinate gauge advocated by Bardeen and Chandrasekhar. We also derive the gauge-invariant relations of the post-Newtonian mass and the constant angular velocity of the rotating fluid with the parameters characterizing the shape of the post-Newtonian ellipsoid including its eccentricity, a semiminor and a semimajor axes. We formulate the post-Newtonian theorems of Pizzetti and Clairaut that are used in geodesy to connect the geometric parameters of the reference ellipsoid to the physically measurable force of gravity at the pole and equator of the ellipsoid. Finally, we expand the post-Newtonian geodetic equations describing the post-Newtonian ellipsoid to the Taylor series with respect to the eccentricity of the ellipsoid and discuss their practical applications for geodetic constants and relations adopted in fundamental astronomy.

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“…It consists in a search for Galactic collapsing stars on the neutrino channel. In this paper, we describe the present status of opto-acoustical gravitational antenna OGRAN 11 constructed for a multi-channel mode monitoring relativistic events and located the deep underground of Baksan Neutrino Observatory (BNO) close to the Baksan Underground Scintillator Telescope (BUST).…”

Section: Introductionmentioning

confidence: 99%

Gravitational wave detector OGRAN as multi-messenger project of RAS-MSU

Rudenko¹,

Gavrilyuk²,

Gusev³

et al. 2020

Int. J. Mod. Phys. A

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Modernized version of the combined opto-acoustical gravitational wave detector OGRAN is presented. Located in the deep underground of the Baksan Neutrino Observatory this setup is aimed to work on the program of collapsing stars searching for in multi-channel manner with the neutrino telescope BUST. The both instruments have the sensitivity allowing a registration of collapses in our Galaxy as rare events with the estimated probability 0.03 year -1 . The OGRAN narrow band sensitivity at the kilohertz frequency is limited by its acoustical mode thermal noise achieving 10 −20 in term of metric perturbations. A possible algorithm of the joint data analysis for the both instruments is developed and resulting formulae of the right detection probability are given. A future increasing of the OGRAN sensitivity associated with the moderate cooling (nitrogen temperature) of the acoustical mode is also discussed.

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A high frequency resonance gravity gradiometer

Cited by 13 publications

References 21 publications

Opto-acoustical gravitational bar detector with cryogenic mirrors

Opto-acoustical gravitational bar detector with cryogenic mirrors

Post-Newtonian reference ellipsoid for relativistic geodesy

Gravitational wave detector OGRAN as multi-messenger project of RAS-MSU

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