Distortions in space-time could put Einstein's theory of relativity to the ultimate test

A telescope image of warped yellow starlight forming a smily face against a black background.
Gravitational lensing -- a phenomenon predicted by Albert Einstein's theory of relativity -- warps starlight into a cosmic smily face. (Image credit: NASA/ESA/JPL-Caltech)

Scientists could soon test Einstein's theory of general relativity by measuring the distortion of time. 

According to new research published June 22 in the journal Nature Astronomy, the newly proposed method turns the edge of space and time into a vast cosmic lab to investigate if general relativity can account for dark matter — a mysterious, invisible form of matter that can only be inferred by its gravitational influence on the universe's visible matter and energy — as well as the accelerating expansion of the universe due to dark energy. The method is ready to be tested on future surveys of the deep universe, according to the study authors.

Related: The expansion of the universe could be a mirage, new theoretical study suggests

General relativity states that gravity is the result of mass warping the fabric of space and time, which Einstein lumped into a four-dimensional entity called space-time. According to relativity, time passes more slowly close to a massive object than it does in a mass-less vacuum. This change in the passing of time is called time distortion.

Since its introduction in 1915, general relativity has been tested extensively and has become our best description of gravity on tremendous scales. But scientists aren't yet sure if it can explain invisible dark matter and dark energy, which together account for around 95% of the energy and matter in the universe.

"Time distortion predicted by general relativity has already been measured very precisely at small distances," Camille Bonvin, lead study author and an associate professor at the University of Geneva, told Live Science via email. "It has been measured for planes flying around the Earth, for stars in our galaxy, and also for clusters of galaxies. We propose a method to measure the distortion of time at very large distances."

The method suggests testing time distortion by measuring redshift, the change in the frequency of light an object emits as it moves away from us. Bonvin said the difference here is that this technique measures redshift caused as light attempts to climb out of a gravitational well, a "dent" in space-time created by a massive object. 

"This climb changes the frequency of the light because time passes at different rates inside and outside of the gravitational well," she said. "As a consequence, the color of the light is changed; it is shifted to red. … By measuring gravitational redshift, we obtain a measurement of the distortion of time."

When distant starlight bends around the gravity of a closer foreground object, it may make an 'Einstein ring' like this. The name is an homage to predictions about space-time made in Einstein's theory of relativity.  (Image credit: ESA/Hubble & NASA/S. Jha/Acknowledgement: L. Shatz)

Time to test general relativity

Time distortion suggests that time is not absolute in our universe but rather passes at varying rates depending on gravitational fields.This idea is not exclusive to general relativity.

"Time distortion exists in all modern theories of gravity," Bonvin said. "However, the amplitude of the time distortion  —  how much the presence of a massive object slows down time —  varies from theory to theory."

In general relativity, the distortions of time and space are predicted to be the same; in other theories of gravity, this is not always the case. That means that by measuring the distortion of time and comparing it to the distortion of space, physicists can test the validity of general relativity.

The team's new method could also test another leading theory of the cosmos: Euler's formula, which astronomers use to calculate the movement of galaxies. Specifically, the team's proposed measurement of time distortion could prove whether dark matter obeys Euler's equation, as prior studies of time distortion have presumed.

The team's method could be employed by future missions, including the European Space Agency's Euclid telescope, which is set to launch in July, and the Dark Energy Spectroscopic Instrument, which is three years into its five-year survey of the universe.

"It will be possible to measure the distortion of time with the data delivered by these surveys," Bonvin said. "This is very interesting because, for the first time, we will be able to compare the distortion of time with that of space, to test if general relativity is valid, and we will also be able to compare the distortion of time with the velocity of galaxies, to see if Euler's equation is valid. With one new measurement, we will be able to test two fundamental laws."

Originally published on LiveScience.com.

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Robert Lea
Contributing Writer

Robert Lea is a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. He also writes about science communication for Elsevier and the European Journal of Physics. Rob holds a bachelor of science degree in physics and astronomy from the U.K.’s Open University. Follow him on Twitter @sciencef1rst.

  • Unclear Engineer
    Glad to see this type of thinking and testing.
    Reply
  • rod
    The article concludes: "It will be possible to measure the distortion of time with the data delivered by these surveys," Bonvin said. "This is very interesting because, for the first time, we will be able to compare the distortion of time with that of space, to test if general relativity is valid, and we will also be able to compare the distortion of time with the velocity of galaxies, to see if Euler's equation is valid. With one new measurement, we will be able to test two fundamental laws."

    Okay, what happened with this report where time dilation is tested and claimed to support GR using high redshift quasars?

    Quasar 'clocks' show the universe was five times slower soon after the Big Bang, https://phys.org/news/2023-06-quasar-clocks-universe-slower-big.html
    ref - Detection of the cosmological time dilation of high-redshift quasars, https://www.nature.com/articles/s41550-023-02029-2, 03-July-2023.

    My note, using the age for the universe at about 1E+9 years old (1 Gyr) and Ned Wright cosmology calculator (https://lambda.gsfc.nasa.gov/toolbox/calculators.html), I get z about 6.0 for the redshift. This indicates time dilation support for the GR metric used to show expanding space. At redshift 6, comoving radial distance 27.487 Gly. Using H0 = 69 km/s/Mpc, space expands at 1.9396649E+00 or about 1.94 x c velocity. This must be true too when accepting the time dilation explanation for the distant quasars in the study. The origin of the SMBH seen, remains difficult to account for in BB cosmology.
    Reply
  • rod
    In ref to my post #3, here is another link on this subject.

    https://www.msn.com/en-us/news/technology/einstein-s-big-bang-theory-may-have-been-proven/ar-AA1dmS9F?ocid=msedgdhp&pc=U531&cvid=e7037cc53fc74f07b270a41f4afe6b42&ei=12
    “With these new data and analysis, however, we’ve been able to find the elusive tick of the quasars and they behave just as Einstein’s relativity predicts."

    Powerful statements here on GR and expanding universe :) As I noted in post #3, SMBH are seen in the study as well as space expanding nearly 2x c velocity is needed too. Both *seeing* naturally evolve in the universe and measure accurately, looks difficult.
    Reply
  • corey555
    rod said:
    The article concludes: "It will be possible to measure the distortion of time with the data delivered by these surveys," Bonvin said. "This is very interesting because, for the first time, we will be able to compare the distortion of time with that of space, to test if general relativity is valid, and we will also be able to compare the distortion of time with the velocity of galaxies, to see if Euler's equation is valid. With one new measurement, we will be able to test two fundamental laws."

    Okay, what happened with this report where time dilation is tested and claimed to support GR using high redshift quasars?

    Quasar 'clocks' show the universe was five times slower soon after the Big Bang, https://phys.org/news/2023-06-quasar-clocks-universe-slower-big.html
    ref - Detection of the cosmological time dilation of high-redshift quasars, https://www.nature.com/articles/s41550-023-02029-2, 03-July-2023.

    My note, using the age for the universe at about 1E+9 years old (1 Gyr) and Ned Wright cosmology calculator (https://lambda.gsfc.nasa.gov/toolbox/calculators.html), I get z about 6.0 for the redshift. This indicates time dilation support for the GR metric used to show expanding space. At redshift 6, comoving radial distance 27.487 Gly. Using H0 = 69 km/s/Mpc, space expands at 1.9396649E+00 or about 1.94 x c velocity. This must be true too when accepting the time dilation explanation for the distant quasars in the study. The origin of the SMBH seen, remains difficult to account for in BB cosmology.

    rod said:
    The article concludes: "It will be possible to measure the distortion of time with the data delivered by these surveys," Bonvin said. "This is very interesting because, for the first time, we will be able to compare the distortion of time with that of space, to test if general relativity is valid, and we will also be able to compare the distortion of time with the velocity of galaxies, to see if Euler's equation is valid. With one new measurement, we will be able to test two fundamental laws."

    Okay, what happened with this report where time dilation is tested and claimed to support GR using high redshift quasars?

    Quasar 'clocks' show the universe was five times slower soon after the Big Bang, https://phys.org/news/2023-06-quasar-clocks-universe-slower-big.html
    ref - Detection of the cosmological time dilation of high-redshift quasars, https://www.nature.com/articles/s41550-023-02029-2, 03-July-2023.

    My note, using the age for the universe at about 1E+9 years old (1 Gyr) and Ned Wright cosmology calculator (https://lambda.gsfc.nasa.gov/toolbox/calculators.html), I get z about 6.0 for the redshift. This indicates time dilation support for the GR metric used to show expanding space. At redshift 6, comoving radial distance 27.487 Gly. Using H0 = 69 km/s/Mpc, space expands at 1.9396649E+00 or about 1.94 x c velocity. This must be true too when accepting the time dilation explanation for the distant quasars in the study. The origin of the SMBH seen, remains difficult to account for in BB cosmology.

    rod said:
    The article concludes: "It will be possible to measure the distortion of time with the data delivered by these surveys," Bonvin said. "This is very interesting because, for the first time, we will be able to compare the distortion of time with that of space, to test if general relativity is valid, and we will also be able to compare the distortion of time with the velocity of galaxies, to see if Euler's equation is valid. With one new measurement, we will be able to test two fundamental laws."

    Okay, what happened with this report where time dilation is tested and claimed to support GR using high redshift quasars?

    Quasar 'clocks' show the universe was five times slower soon after the Big Bang, https://phys.org/news/2023-06-quasar-clocks-universe-slower-big.html
    ref - Detection of the cosmological time dilation of high-redshift quasars, https://www.nature.com/articles/s41550-023-02029-2, 03-July-2023.

    My note, using the age for the universe at about 1E+9 years old (1 Gyr) and Ned Wright cosmology calculator (https://lambda.gsfc.nasa.gov/toolbox/calculators.html), I get z about 6.0 for the redshift. This indicates time dilation support for the GR metric used to show expanding space. At redshift 6, comoving radial distance 27.487 Gly. Using H0 = 69 km/s/Mpc, space expands at 1.9396649E+00 or about 1.94 x c velocity. This must be true too when accepting the time dilation explanation for the distant quasars in the study. The origin of the SMBH seen, remains difficult to account for in BB cosmology.

    rod said:
    In ref to my post #3, here is another link on this subject.

    https://www.msn.com/en-us/news/technology/einstein-s-big-bang-theory-may-have-been-proven/ar-AA1dmS9F?ocid=msedgdhp&pc=U531&cvid=e7037cc53fc74f07b270a41f4afe6b42&ei=12
    “With these new data and analysis, however, we’ve been able to find the elusive tick of the quasars and they behave just as Einstein’s relativity predicts."

    Powerful statements here on GR and expanding universe :) As I noted in post #3, SMBH are seen in the study as well as space expanding nearly 2x c velocity is needed too. Both *seeing* naturally evolve in the universe and measure accurately, looks difficult.
    Both *seeing* naturally evolve in the universe and measure accurately,
    Reply
  • corey555
    Both *seeing* naturally evolve in the universe and measure accurately, looks difficult.
    Reply
  • Unclear Engineer
    So, if things appear to be slower in the distant universe due to time dilation effects, then that should account for some of the redshift.

    But, it also makes it even harder to explain how stars and galaxies evolved faster than predicted by the BBT.
    Reply
  • corey555
    Shows that Einstein was right
    Reply
  • corey555
    All familiar matter—Earth, the rest of the solar system, stars, galaxies, and interstellar gas—accounts for only about one-sixth of the mass of the universe. Scientists can see the effects of the rest of the universe’s mass, which they call dark matter. Its presence in galaxies makes them rotate more quickly than if only normal matter were there, and high concentrations of it noticeably bend light coming from far away.
    Reply