Tag Archives: relativity

Gravitational Wave Signal Confirms Einstein’s Theory of Relativity

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Artist’s impression of black hole collision

Artist’s Impression of the Black Hole Collision Producing GW250114

A. Simonette/Sonoma State University, LIGO-Virgo-KAGRA Collaboration, University of Rhode Island

The groundbreaking collision of two black holes provides an exceptional opportunity for scientists to validate Einstein’s theory of general relativity, demonstrating the accuracy of physicists’ predictions once more.

In 2025, an international team of gravitational wave detectors, featuring state-of-the-art laser arrays, identified a significant distortion in space-time known as GW250114. This event is attributed to the merger of two black holes.

These advanced detectors—such as the US Laser Interferometer Gravitational-Wave Observatory (LIGO) and Italy’s Virgo detector—have achieved unprecedented sensitivity since LIGO’s inaugural detection in 2016. Consequently, GW250114 offers the clearest and most detailed data on gravitational wave phenomena to date, serving as a unique testing ground for well-established physical theories.

Recently, researchers applied data from GW250114 to evaluate Stephen Hawking’s theorem, posited over half a century ago. This theorem claims that the event horizon of a merging black hole cannot be smaller than the total mass of its progenitor black holes. The findings confirmed Hawking’s prediction with near certainty.

Keefe Mittman and his team at Cornell University took this analysis a step further by assessing whether black hole mergers comply with Albert Einstein’s theoretical framework.

Einstein’s equations articulate how massive objects navigate space-time. By manipulating and resolving these equations for the merging black holes, researchers can visualize the dynamics: the black holes spiral together, accelerate, collide, release substantial energy, and subsequently resonate at distinct frequencies—akin to a bell chiming after a strike.

These frequencies, referred to as ringdown modes, were relatively faint in prior gravitational wave events, obscuring the complex structures foreseen by Einstein. However, GW250114 generated enough amplitude to effectively validate the predicted oscillation patterns. Mittmann and his colleagues utilized simulations based on Einstein’s equations to estimate the intensity and frequencies of the black hole’s oscillations. The actual measurements closely aligned with these predictions.

“The amplitudes of the data we measured align remarkably well with the predictions of numerical relativity,” Mittmann confirms. “Einstein’s equations may be complex to solve, yet the correlations observed at the detector validate general relativity.”

“The conclusion is clear: Einstein’s predictions still hold true,” states Laura Nuttall from the University of Portsmouth, UK. “All observations correspond to Einstein’s assertions regarding gravity.”

Despite the impressive amplitude of GW250114, the frequencies remain faint enough that Mittmann’s team couldn’t dismiss a variance from Einstein’s predictions of less than 10 percent. This limitation primarily results from current detector sensitivities and is likely to lessen as gravitational wave detection technology evolves. Any deviations from Einstein’s theory would manifest as persistent discrepancies.

“As we catalog more events or observe larger singular events, the measurement error margins can approach zero—or diverge,” Mittmann notes. “A divergence would be considerably more intriguing.”

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Updated on February 11, 2026

Amended information regarding the characteristics of ringdown modes in prior gravitational wave events.

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Source: www.newscientist.com

Ultracold Atoms May Investigate Relativity in the Quantum Realm

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Spinning ultracold atoms could uncover the limits of Einstein’s relativity

Shutterstock / Dmitriy Rybin

Small Ferris wheels made from light and extremely chilled particles could enable scientists to investigate elements of Albert Einstein’s theory of relativity on an extraordinary level.

Einstein’s special and general theories of relativity, established in the early 20th century, transformed our comprehension of time by illustrating that a moving clock can tick slower than a stationary one. If one moves rapidly or accelerates significantly, time measured will also increase. The same applies when an object moves in a circular path. While these effects have been noted in relatively large celestial entities, Vassilis Rembesis and his team at King Saud University in Saudi Arabia have developed a method to test these principles on a diminutive scale.

By examining rotation and time at the molecular level (atoms and molecules), they explored ultracold regions, just a few millionths of a degree above absolute zero. In this domain, the quantum behavior and movement of atoms and molecules can be meticulously controlled with laser beams and electromagnetic fields. In 2007, Rembesis and his colleagues formulated a technique to tune a laser beam to trap atoms in a cylindrical form, allowing them to spin. They refer to this as an “optical Ferris wheel,” and Rembesis asserts that their new findings propose that it can be used to observe relativistic time dilation in ultracold particles.

Their predictions indicate that nitrogen molecules are optimal candidates for investigating rotational time delays at the quantum level. By considering the movement of electrons within them as the ticks of an internal timer, the researchers detected frequency changes as minuscule as 1/10 quintillion.

Simultaneously, Rembesis noted that experiments utilizing optical Ferris wheels have been sparse up until now. This new proposal opens avenues for examining relativity theory in uncharted conditions where new or surprising phenomena may emerge. For instance, the quantum characteristics of ultracold particles may challenge the “clock hypothesis,” which states how a clock’s acceleration influences its ticking.

“It’s crucial to validate our interpretations of physical phenomena within nature. It’s often during unexpected occurrences that we need to reevaluate our understanding for a deeper insight into the universe. This research offers an alternative approach to examining relativistic systems, providing distinct advantages over traditional mechanical setups,” says Patrick Oberg from Heriot-Watt University, UK.

Relativistic phenomena, such as time dilation, generally necessitate exceedingly high velocities; however, optical Ferris wheels enable access to them without the need for impractically high speeds, he explains. Aidan Arnold from the University of Strathclyde, UK adds, “With the remarkable accuracy of atomic clocks, the time difference ‘experienced’ by the atoms in the Ferris wheel should be significant. Because the accelerated atoms remain in close proximity, there is ample opportunity to measure this difference,” he states.

By adjusting the focus of the laser beam, it may also become feasible to manipulate the dimensions of the Ferris wheel that confines the particles, allowing researchers to explore time-delay effects for various rotations, as noted by Rembesis. Nevertheless, technical challenges persist, including the need to ensure that atoms and molecules do not heat up and become uncontrollable during rotation.

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Source: www.newscientist.com

General Relativity Could Rescue Some Planets from Oblivion

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Illustration of two planets circling white dwarf stars

Julian Baum/Science Photo Library

Planets in orbit around white dwarf stars may have the potential to remain habitable due to subtle movements dictated by the general theory of relativity.

As sun-like stars deplete their fuel, they expand into red giants, shedding their outer layers, ultimately leaving behind a dense, hot core called a white dwarf. Evidence shows that giant planets can continue orbiting these remnants, indicating that life may withstand the stars’ expansion.

Moreover, rocky planets could potentially orbit close to these stars within a compact habitable zone. This zone is the region around the star where liquid water can exist on a planet’s surface, though it has yet to be observed. White dwarfs can remain hospitable for immense periods, as they cool down very gradually, possibly for trillions of years.

The habitable zone is located million kilometers away from the stars and is significantly narrower than Earth’s orbit of 150 million kilometers. Previous studies indicated that a massive orbiting planet makes survival untenable due to tidal heating effects: the gravitational pull of a larger planet generates internal friction, leading to a runaway greenhouse effect akin to that of Venus.

However, modeling conducted by Eva Stafne suggests this might not necessarily be the case. Juliet Becker, from the University of Wisconsin-Madison, found that, under certain conditions, Einstein’s general theory of relativity can provide a lifeline for the inner planet.

According to general relativity, massive objects warp space-time, which can be visualized as a dip or “well” on a flat surface. Essentially, the gravity wells of the host star become detached from the orbiting planet, slowly rotating and interacting inconsistently as the planet moves in and out of these wells.

“There’s a precession that separates the outer planet from the inner planet,” says Stafne, which prevents extreme tidal effects on the inner planet. “Past simulations did not consider general relativity, but this highlights the importance of including it in these close systems.”

Without considering general relativity, the outer planet, which would need to be at least 18 times more massive than the innermost planet, could provoke this runaway greenhouse effect, Becker explains. Yet, “factoring in general relativity changes the outcome dramatically,” she states. The inner planet can remain hospitable to similar distances, even with an outer planet as large as Neptune.

Mary Anne Limbach from the University of Michigan is uncertain about the likelihood of discovering such systems. “I’m not even sure if any habitable planets exist around white dwarfs,” she states. Telescopes like the James Webb Space Telescope are actively on the lookout for rocky worlds in the vicinity of white dwarfs.

Nevertheless, this research reveals a unique series of plausible scenarios where inhabitants of distant worlds may thrive under suitable conditions, thanks to the bending of space-time.

“We might have a better understanding of how common relativity can be than we think,” Limbach observes.

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Source: www.newscientist.com

Recent Discovery of Messier 87 Black Hole Supports Einstein’s General Theory of Relativity

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In April 2019, the Event Horizon Telescope (EHT) collaboration resolved the central black hole of the giant elliptical galaxy Messier 87 (M 87), known as M87*, the first-ever event horizon-scale black hole. I reported the image. . In a new paper, astronomers present new images of M87* from data collected by the Atacama Large Millimeter/Submillimeter Array (ALMA), the Greenland Telescope, and several other instruments within the EHT. doing. These new images show the shadow of his M87* as predicted by general relativity. Interestingly, the peak brightness of the ring is shifted by about 30 degrees compared to the first image. This is consistent with the theoretical understanding of fluctuations due to turbulent matter around a black hole.

The Event Horizon Telescope Collaboration has released new images of M87* from observations taken in April 2018, one year after the first observations in April 2017. The new observations reveal a familiar bright luminescent ring, the same size as the one originally observed. The brightest part of the ring has moved about 30 degrees to the 5 o'clock position compared to the 2017 image. Image credit: EHT Collaboration.

“A fundamental requirement of science is to be able to reproduce results,” says Dr. Keiichi Asada, an astronomer at the Institute of Astronomy and Astrophysics, Academia Sinica.

“The confirmation of the ring in a completely new data set is a major milestone for our collaboration and a strong indication that we are observing the shadow of a black hole and the matter orbiting around it. .”

An image of M87* taken in 2018 is strikingly similar to what astronomers saw in 2017.

They see bright rings of the same size, with a dark central area and one side of the ring brighter than the other.

Because M87*'s mass and distance do not increase appreciably over a human lifetime, general relativity predicts that the diameter of the ring will remain the same from year to year.

The diameter stability measured in the 2017-2018 images strongly supports the conclusion that M87* is well described by general relativity.

“One of the remarkable properties of a black hole is that its radius strongly depends on only one quantity: its mass,” said Dr. Nitika Yadrapalli-Yurku, a postdoctoral fellow at NASA's Jet Propulsion Laboratory.

“M87* is not a material that gains mass rapidly, so according to general relativity, its radius will change little throughout human history. We see our data confirm this prediction. That's very interesting.”

Although the size of the black hole's shadow did not change between 2017 and 2018, the location of the brightest region around the ring changed significantly.

The bright area rotated about 30 degrees counterclockwise and settled in the lower right part of the ring, at about the 5 o'clock position.

Historical observations of M87* with less sensitive arrays and a small number of telescopes also show that the shadow structure changes from year to year, but with low precision.

Although the 2018 EHT array cannot yet observe jets emerging from M87*, the black hole's axis of rotation predicted from the location of the brightest region around the ring is more consistent with the axis of jets seen at other wavelengths. Masu.

“The biggest change is that the brightness peak has moved around the ring, which is actually the first time in 2019 that “This is what we predicted when we announced the results.”

“According to general relativity, the size of the ring should remain approximately constant, but radiation from the turbulent and messy accretion disk around the black hole causes the brightest parts of the ring to move toward a common center. It wobbles around you.”

“The amount of wobble observed over time can be used to test theories about the magnetic field and plasma environment around the black hole.”

of new results appear in the diary astronomy and astrophysics.

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Collaboration with Event Horizon Telescope. 2024. The persistent shadow of M 87's supermassive black hole. I. Observation, Calibration, Imaging, and Analysis. A&A 681, A79; doi: 10.1051/0004-6361/202347932

Source: www.sci.news