LISA Pathfinder first results

2017 ◽  
Vol 26 (05) ◽  
pp. 1741023 ◽  
Author(s):  
D. Vetrugno ◽  
Keyword(s):  
Gravitational Wave ◽  
Laser Interferometer ◽  
Free Fall ◽  
Space Antenna ◽  
Essential Ingredient ◽  
Lisa Pathfinder ◽  
Laser Interferometer Space Antenna ◽  
The Future ◽  
First Results

LISA Pathfinder (LPF) is an in-flight technological demonstrator designed and launched to prove the feasibility of sub-femto-[Formula: see text] free fall of kilo-sized test masses (TM), an essential ingredient for the future gravitational wave observatory from space. Half a year after launch, the first results are available and show an incredibly well-performing instrument. The results represent a first and important step towards the long awaited construction and launch of LISA, the Laser Interferometer Space Antenna.

scholarly journals LISA: laser interferometer space antenna for gravitational wave measurements

1996 ◽  
Vol 13 (11A) ◽  
pp. A247-A250 ◽  
Author(s):  
Karsten Danzmann ◽  
the LISA study team
Keyword(s):  
Gravitational Wave ◽  
Laser Interferometer ◽  
Space Antenna ◽  
Wave Measurements ◽  
Laser Interferometer Space Antenna

LISA - Laser Interferometer Space Antenna for gravitational wave measurements

1995 ◽  
Author(s):  
W Folkner ◽  
R Hellings ◽  
L Maleki ◽  
P Bender ◽  
J Fallen ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Laser Interferometer ◽  
Space Antenna ◽  
Wave Measurements ◽  
Laser Interferometer Space Antenna

A telescope for LISA – the Laser Interferometer Space Antenna

2018 ◽  
Vol 7 (6) ◽  
pp. 395-400
Author(s):  
Isabel Escudero Sanz ◽  
Astrid Heske ◽  
Jeffrey C. Livas
Keyword(s):  
Gravitational Wave ◽  
Gravitational Waves ◽  
Laser Interferometer ◽  
Full Range ◽  
High Energy ◽  
Relativity Theory ◽  
Space Antenna ◽  
Long Distance ◽  
Optical Telescope ◽  
Laser Interferometer Space Antenna

Abstract Gravitational waves are a prediction of Einstein’s general relativity theory. In autumn 2017, the Laser Interferometer Gravitational-Wave Observatory (LIGO; https://www.ligo.caltech.edu/) experiment reported the first detection of gravitational waves in addition to electromagnetic radiation from the collision of two neutron stars. This marks the first time that a cosmic event has been viewed in both gravitational waves and light and opens the door to a new type of astronomical observatory based on gravitational waves. The gravitational wave spectrum covers a broad span of frequencies and requires both space- and ground-based observatories to cover the full range. Space-based gravitational wave observatories, such as the proposed Laser Interferometer Space Antenna (LISA), operate at frequencies between 0.1 mHz and 1 Hz and complement the frequency range of 30–1000 Hz accessible by ground-based gravitational wave observatories, such as LIGO. A rich array of high-energy astrophysical sources is expected in the LISA measurement band. LISA was selected in 2017 as the third large mission of the Cosmic Vision program of the European Space Agency. The National Aeronautics and Space Administration will collaborate on both the scientific and technical aspects of this mission. This paper addresses the design of the optical telescope as an essential component of LISA’s long-distance interferometric measurement system.

scholarly journals Time-delay interferometry

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
Massimo Tinto ◽  
Sanjeev V. Dhurandhar
Keyword(s):  
Time Delay ◽  
Laser Interferometer ◽  
Laser Light ◽  
Space Antenna ◽  
Phase Measurements ◽  
Laser Noise ◽  
Future Space ◽  
Laser Interferometer Space Antenna ◽  
Overall Performance ◽  
Mathematical Foundations

AbstractEqual-arm detectors of gravitational radiation allow phase measurements many orders of magnitude below the intrinsic phase stability of the laser injecting light into their arms. This is because the noise in the laser light is common to both arms, experiencing exactly the same delay, and thus cancels when it is differenced at the photo detector. In this situation, much lower level secondary noises then set the overall performance. If, however, the two arms have different lengths (as will necessarily be the case with space-borne interferometers), the laser noise experiences different delays in the two arms and will hence not directly cancel at the photo detector. To solve this problem, a technique involving heterodyne interferometry with unequal arm lengths and independent phase-difference readouts has been proposed. It relies on properly time-shifting and linearly combining independent Doppler measurements, and for this reason it has been called time-delay interferometry (TDI). This article provides an overview of the theory, mathematical foundations, and experimental aspects associated with the implementation of TDI. Although emphasis on the application of TDI to the Laser Interferometer Space Antenna mission appears throughout this article, TDI can be incorporated into the design of any future space-based mission aiming to search for gravitational waves via interferometric measurements. We have purposely left out all theoretical aspects that data analysts will need to account for when analyzing the TDI data combinations.

Pulsar–black hole binaries as a window on quantum gravity

2017 ◽  
Vol 26 (12) ◽  
pp. 1743004 ◽  
Author(s):  
John Estes ◽  
Michael Kavic ◽  
Matthew Lippert ◽  
John H. Simonetti
Keyword(s):  
Quantum Gravity ◽  
Laser Interferometer ◽  
Mean Square ◽  
Mean Square Deviation ◽  
Space Antenna ◽  
Gravitational Effects ◽  
Arrival Times ◽  
Black Hole Binaries ◽  
Laser Interferometer Space Antenna ◽  
Square Kilometer Array

Pulsars (PSRs) are some of the most accurate clocks found in nature, while black holes (BHs) offer a unique arena for the study of quantum gravity. As such, PSR–BH binaries provide ideal astrophysical systems for detecting effects of quantum gravity. With the success of aLIGO and the advent of instruments like the Square Kilometer Array (SKA) and Evolved Laser Interferometer Space Antenna (eLISA), the prospects for discovery of such PSR–BH binaries are very promising. We argue that PSR–BH binaries can serve as ready-made testing grounds for proposed resolutions to the BH information paradox. We propose using timing signals from a PSR beam passing through the region near a BH event horizon as a probe of quantum gravitational effects. In particular, we demonstrate that fluctuations of the geometry outside a BH lead to an increase in the measured root-mean-square deviation of arrival times of PSR pulsar traveling near the horizon.

In-orbit performance of the laser interferometer of Taiji-1 experimental satellite

2021 ◽  
pp. 2140004
Author(s):  
He-Shan Liu ◽  
Zi-Ren Luo ◽  
Wei Sha ◽  
Keyword(s):  
Laser Interferometer ◽  
Fused Silica ◽  
Test Mass ◽  
Frequency Range ◽  
Space Antenna ◽  
Satellite Platform ◽  
Laser Interferometer Space Antenna ◽  
Key Technologies ◽  
Carrier Rocket ◽  
Reference Sensor

Taiji-1, which is the first experimental satellite for space gravitational wave detection in China, relies on key technologies which include the laser interferometer, the gravitational reference sensor (GRS), the micro-thruster and the satellite platform. Similarly to the Laser Interferometer Space Antenna (LISA) pathfinder, except for the science interferometer, the optical bench (OB) of Taiji-1 contains reference and test mass (TM) interferometers. Limited by the lower mechanical strength of the carrier rocket and by the orbit environment, the OB of Taiji-1 is made of invar steel and fused silica, and it is aimed to achieve a sensitivity of the order of 100[Formula: see text]pm/[Formula: see text]. The experimental results from in-orbit tests of Taiji-1 demonstrate that the interferometer can reach a sensitivity of 30[Formula: see text]pm/[Formula: see text] in the frequency range of 0.01–10[Formula: see text]Hz, which satisfies the requirements of Taiji-1 mission.

scholarly journals Lasers and Optics for the Laser Interferometer Space Antenna (LISA)

2020 ◽  
Vol 243 ◽  
pp. 08001
Author(s):  
Nelson Christensen
Keyword(s):  
Laser Interferometer ◽  
Space Antenna ◽  
Laser Interferometer Space Antenna
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