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Plans for new Einstein Telescope unveiled in Europe

Scientists in Europe will unveil plans today for an ambitious new observatory to seek out gravitational waves — tiny ripples in the fabric of space-time — and potentially uncover secrets of the earliest moments of the universe.
An artist's view of the proposed Einstein Telescope observatory.
An artist's view of the proposed Einstein Telescope observatory.ASPERA
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Scientists in Europe unveiled plans on Thursday for an ambitious new observatory to seek out gravitational waves — tiny ripples in the fabric of space-time — and potentially uncover secrets of the earliest moments of the universe.

After three years of study, designs for the proposed Einstein Telescope (ET) were presented at the European Gravitational Observatory site in Pisa, Italy. The multiyear design study involved more than 200 scientists in Europe and around the world, and the advanced observatory is pegged as a next-generation gravitational wave detector that will be 100 times more sensitive than existing instruments.

During Thursday's unveiling, project scientists outlined the Einstein Telescope's scientific goals, as well as the detector's layout and technology, timescale and estimated costs. The current estimated price of the observatory is $1.42 billion.

Probing the universe
The Einstein Telescope is expected to be capable of making precise measurements of gravitational waves, which are predicted to emanate from cosmic catastrophes such as merging black holes, collapsing stars and supernova explosions.

The sophisticated telescope also offers the potential to probe the nature of the early universe just after the Big Bang that set things in motion 13.7 billion years ago, according to a project description.

To achieve such a high degree of sensitivity, the observatory will be built underground at a depth of about 330 to 650 feet, which should reduce the interfering effects of residual seismic motion, researchers said. This should also enable the detector to sense the entire range of gravitational wave frequencies that can be measured on Earth, they added.

"An observatory achieving that level of sensitivity will turn (gravitational wave) detection into a routine astronomical tool. ET will lead a scientific revolution," Michele Punturo, scientific coordinator of the design study, said in a statement.

Ultra-precise measurements
The observatory will measure gravitational waves by detecting the very slight changes they cause when they flow through an object.

It consists of three detectors, each connecting to two arms more than a mile long. When a gravity wave passes through, it will stretch and shrink the arms' lengths slightly, depending on their alignment with the direction of the wave.

A series of laser pulses will measure the arms' lengths with high precision to detect the tiny changes (far less than the size of an atomic nucleus) that occur when a gravity wave has passed through.

Big project with a big price tag
The Einstein Telescope design study was supported by the European Commission, which is an executive body of the European Union. The Commission allocated about $4.3 million dollars for the study.

"With this grant, the European Commission recognized the importance of gravitational wave science as developed in Europe, its value for fundamental and technological research, provided a common framework for the European scientists involved in the gravitational wave search and allowed for a significant step towards the exploration of the universe with a completely new enquiry instrument," said European Gravitational Observatory director Federico Ferrini, who served as project coordinator of the Einstein Telescope design study.

The new telescope is a joint project of eight European research institutes, under the direction of the European Gravitational Observatory. Scientists from institutions in the United States and Japan also were active collaborators in the design study.

A separate joint U.S.-European plan to build a space observatory to seek out gravity waves was recently canceled because NASA was unable to contribute the funding required for the ambitious mission.

The project, called the Laser Interferometer Space Antenna, or LISA, was slated to search for ripples in space-time that were predicted by Einstein's theory of general relativity. The mission was a partnership between the European Space Agency and NASA.

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