gravity probe exceeds performance goals - laser light measurement device

by:UMeasure     2019-10-17
gravity probe exceeds performance goals  -  laser light measurement device
The long-
The planned LISA mission to detect gravitational waves in space looks like it will soon be lit up in green.
Scientists who are demonstrating their key measurement techniques say they have just beaten the required sensitivity performance.
European Space Agency (Esa)
This will run billion-
The European delegation now expects to "select" the project as early as June.
Lisa's company intends to follow suit. Based on the detector.
These have witnessed the distortion of space.
Time of black hole occurrence 10-
20 times the mass of the Sun collided with about a billion light.
Years from Earth.
However, LISA's goal is to detect the aggregation of truly huge black holes that are millions of times the mass of the sun, all the way to the edge of the observable universe.
Researchers will use this information to track the evolution of the universe, from the earliest structures to the complex network of galaxies we see today.
The performance success of the measurement demonstration was announced at the annual meeting of the Boston American Association for the Advancement of Science (AAAS).
It happened to LISA "Pathfinder" at Esa "(LPF)
The spaceship has been flying for more than a year.
The detector is testing various parts of the laser interferometer that will eventually be used to detect gravitational waves passing through.
When Pathfinder's instrument starts to run, one hopes that it will be within 10 times the sensitivity that LISA's mission ultimately needs, that's right.
In this case, LPF not only matches this mark, but continues to surpass it after 12 months of experiments.
"You can do a comprehensive scientific study of LISA based on what LPF gets.
This is exciting;
Professor Stefano Vitale, the lead researcher for Pathfinder, told BBC News that "it's really beyond our dreams . ".
Gravitational waves-
Ripples in spatial structure
At the end of 2015, the LIGO Laboratory in the United States detected gravitational waves for the first time, which is described as one of the most important physical breakthroughs in decades.
Able to feel the subtle twist of space
The time caused by catastrophic events provides a whole new way to study the universe, which does not depend on traditional telescope technology.
Instead of trying to see the light from a distance
Instead, scientists "listen" to the vibrations these events create in the structure of the universe.
LIGO has been successful by identifying minor disturbances in the laser
A still mirror suspended in the long vacuum tunnel of kilomet.
Lisa will do something very similar, except that its laser will be free-floating gold-
The platinum blocks carried on three identical ships are separated by 2. 5 million km.
Laser science: Lisa Pathfinder's technical demonstration in both cases, the requirement is to describe the tiny acceleration when the gravitational waves passed in the measuring device are squeezed and stretched.
For LISA, the expected standard is to describe the following sports for womeng level -
An apple falling on the surface of the Earth experiences one in a million of acceleration;
Do so in minutes to hours.
LISA Pathfinder has just succeeded in sub-
Female sensitivity to half-day time.
It is very important to obtain stability at the lowest frequency.
"The lower the frequency you go, the larger the object that produces gravitational waves;
The stronger the gravitational waves;
The farther the body is.
So the lower the frequency, the deeper the universe you enter, "explains Professor Vitale, affiliated to the Italian Institute of Nuclear Physics and the University of Trento.
To be clear, since the "arm length" of the system has shrunk from 2, the LPF itself cannot detect gravitational waves.
5 million to 38 cm
Able to install in a demo ship-
But this is a good sign for the whole system.
Esa recently called for the implementation of the gravity science mission in 2034.
The BBC knows that the agency has received only one submission.
From the LISA Consortium. This is unusual.
Often, such a call would attract several groups to submit some submissions that all have different ideas about a task.
But in this case, it may not be surprising given that the LISA concept has been studied for more than 20 years.
Professor Karsten Danzmann, United
The PI on LPF and LISA's main proposers hope to find a way to drive three of his consortium-
The spacecraft detection system is earlier than 2034, maybe earlier than 2029.
But that requires enough money.
"The launch date is only Program-led, not technically," Professor Dan Zeman told BBC News . ".
"With the increasing interest in gravitational waves now, people will find ways to fly almost at the same time as Athena (Europe's next-generation X-
The mine telescope scheduled for launch on 2028).
"It would be totally meaningful because we can tell X-
Ray, guys, where to look, because we'll get any bright alarm (black hole)
Then we can tell them, 'you'll see an X-in an hour-ray flash'.
"It will be a lot more exciting.
Messenger astronomy with Lisa and Athena.
"LISA could be selected as a confirmation item for the ESA Scientific Programme Committee in June.
A technical review will then be conducted, followed by parallel industrial studies to assess the best and most cost-effective-
An effective way to build a mission.
They will also seek to reach an agreement with the Americans to join.
They could contribute about $300.
The total cost of the component form is 400 m, such as the laser emitted between LISA's three spaceships.
The LPF demo experiment will end at the latest on June or 5. Jonathan. Amos-INTERNET@bbc. co.
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