ASTROD, ASTROD I and their gravitational-wave sensitivities

Ni, Wei-Tou; Shiomi, Sachie; Liao, An-Chi

doi:10.1088/0264-9381/21/5/037

Cited by 48 publications

(71 citation statements)

References 13 publications

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“…The obtainable accuracy for γ is of the order of 10 −5 -10 −7 (Vecchiato et al 2003). The ASTROD mission should be able to measure J 2 with a claimed accuracy of the order of 10 −8 or, perhaps, 10 −9 −10 −10 (Ni et al 2004). The claimed obtainable accuracy for the PPN parameters is 4.6 × 10 −7 for γ and 4 × 10 −7 for β.…”

Section: The Possibilities Opened By the Future Missionsmentioning

confidence: 99%

On the possibility of measuring the solar oblateness and some relativistic effects from planetary ranging

Iorio¹

2005

A&A

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Abstract. In this paper we first calculate the post-Newtonian gravitoelectric secular rate of the mean anomaly of a test particle freely orbiting a spherically symmetric central mass. Then, we propose a novel approach to suitably combine the presently available planetary ranging data to Mercury, Venus and Mars in order to determine, simultaneously and independently of each other, the Sun's quadrupole mass moment J 2 and the secular advances of the perihelion and the mean anomaly. This would also allow to obtain the PPN parameters γ and β independently. We propose to analyze the time series of three linear combinations of the observational residuals of the rates of the nodesΩ, the longitudes of periheliaπ and mean anomaliesṀ of Mercury, Venus and Mars suitably built up in order to absorb the secular precessions induced by the solar oblateness and the post-Newtonian gravitoelectric forces. The values of the three investigated parameters can be obtained by fitting the expected linear trends with straight lines, determining their slopes in arcseconds per century and suitably normalizing them. According to the present-day EPM2000 and DE405 ephemerides accuracy, the obtainable precision would be of the order of 10 −3 -10for the PPN parameters and, more interestingly, of 10 −9 for J 2 . It must be pointed out that the future BepiColombo mission should improve the knowledge of the Mercury's orbit perhaps by one order of magnitude.

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Section: The Possibilities Opened By the Future Missionsmentioning

confidence: 99%

On the possibility of measuring the solar oblateness and some relativistic effects from planetary ranging

Iorio¹

2005

A&A

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“…A baseline implementation of ASTROD is to have two spacecraft in separate solar orbit carrying as payload, a proof mass, two telescopes, two 1-2 W lasers, a clock and a drag-free system, together with a similar L1/L2 spacecraft [1][2][3][4]. The three spacecraft range coherently with one another using lasers to map the solar-system gravity, to test relativistic gravity and to detect gravitational waves.…”

Section: Astrodmentioning

confidence: 99%

“…For space interferometry missions, we see important research developments for LISA Mission and its technology demonstrator---LISA Pathfinder. In this short paper, we report on the progress for a deep-space mission concept, ASTROD /ASTROD I [1][2][3][4][5][6]. (ASTROD: ASTRODynamical Space Test of Relativity using Optical Devices)…”

Section: Introductionmentioning

confidence: 99%

ASTROD and ASTROD I: Progress Report

Ni¹,

Araújo²,

Bao³

et al. 2006

J. Phys.: Conf. Ser.

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Over the next decade the gravitational physics community will benefit from dramatic improvements in many technologies critical to the tests of gravity and gravitational-wave detection. The highly accurate deep space navigation, interplanetary laser ranging and communication, interferometry and metrology, high precision frequency standards, precise pointing and attitude control, together with the drag-free technologies will revolutionize the field of the experimental gravitational physics. Deep-space laser ranging will be ideal for gravitational-wave detection, and testing relativity and measuring solar-system parameter to an unprecedented accuracy. ASTROD I is such a mission with single spacecraft; it is the first step of ASTROD (Astrodynamical Space Test of Relativity using Optical Devices) with 3 spacecraft. In this paper, we will present the progress of ASTROD and ASTROD I with emphases on the acceleration noises, mission requirement, charging simulation, drag-free control and low-frequency gravitational-wave sensitivity.

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“…Unlike gravitational radiations from finite stellar objects, RGWs exist everywhere and anytime, and have a wide spreading spectrum, serving as one of the major scientific goals of the laser interferometers gravitywave detections, including the current LIGO [4], VIRGO [5], GEO600 [6], TAMA [7], AIGO [8], and the future LISA [9], ASTROD [10], BBO [11], and DECIGO [12]. Moreover, along with the density perturbations, RGWs also contribute to the CMB anisotropies and polarizations [13,14,15,16,17].…”

Section: Introductionmentioning

confidence: 99%

Modifications by the QCD transition ande+e−annihilation of the analytic spectrum of relic gravitational waves in the accelerating universe

et al. 2008

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As predicted by quantum chromodynamics(QCD), around T ∼ 190 MeV in the early universe, the QCD transition occurs during which the quarks are combined into the massive hadrons.This process reduces the effective relativistic degree of freedom, and causes a change in the expansion behavior of the universe. Similarly, the e + e − annihilation occurred around T ∼ 0.5 Mev has the same kind of effect. Besides, the dark energy also drives the present stage accelerating expansion. We study these combined effects on the relic gravitational waves (RGWs). In our treatment, the QCD transition and the e + e − annihilation, each is respectively represented by a short period of expansion inserted into the radiation era. Incorporating these effects, the equation of RGWs is analytically solved for a spatially flat universe, evolving from the inflation up to the current acceleration, and the spectrum of RGWs is obtained, covering the whole range of frequency > 10 −19 Hz. It is found that the QCD transition causes a reduction of the amplitude of RGWs by ∼ 20% in the range > 10 −9 Hz, and the e + e − annihilation causes a reduction ∼ 10% in the range > 10 −12 Hz. In the presence of the dark energy, the combination of the QCD transition and the e + e − annihilation, causes a larger reduction of the amplitude by ∼ 30% for the range > 10 −9 Hz, which covers the bands of operation of LIGO and LISA. By analysis, it is shown that RGWs will be difficult to detect by the present LIGO, but can be tested by LISA for certain inflationary models.

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ASTROD, ASTROD I and their gravitational-wave sensitivities

Cited by 48 publications

References 13 publications

On the possibility of measuring the solar oblateness and some relativistic effects from planetary ranging

On the possibility of measuring the solar oblateness and some relativistic effects from planetary ranging

ASTROD and ASTROD I: Progress Report

Modifications by the QCD transition ande+e−annihilation of the analytic spectrum of relic gravitational waves in the accelerating universe

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