All articles tagged with #spacetime
Researchers propose an extended gravity theory called Finsler gravity that broadens spacetime geometry; when applied to the Friedmann equations, it naturally yields cosmic acceleration without a dark energy term, suggesting geometry could drive the universe’s speeding expansion.
Astronomers have directly observed a spinning black hole twisting spacetime, confirming Einstein's prediction of frame-dragging through the detection of Lense-Thirring precession during a tidal disruption event, using X-ray and radio telescopes, deepening our understanding of black hole physics and spacetime dynamics.
Astronomers have directly observed a spinning black hole twisting spacetime, confirming Einstein's century-old prediction of frame-dragging through the detection of wobbling in a star's debris disk and jets during a tidal disruption event, using X-ray and radio observations.
Astronomers observed a star being torn apart by a supermassive black hole in galaxy LEDA 145386, providing the most detailed evidence yet of frame-dragging, a prediction of general relativity, as the black hole's rotation twists spacetime around it.
Astronomers have directly observed a whirlpool in spacetime caused by a rapidly spinning black hole, providing the first empirical evidence of the Lense–Thirring precession, a phenomenon where a spinning black hole drags spacetime around with it, confirming a long-standing theoretical prediction.
New theoretical research suggests that the properties of matter and forces may originate from the geometry of unseen extra dimensions, specifically seven-dimensional shapes called G2-manifolds, with implications for understanding mass, cosmic expansion, and potentially discovering new particles like the 'Torstone.'
A new study proposes that particle mass and fundamental forces could originate from the geometry of hidden extra dimensions, specifically through evolving seven-dimensional shapes called G₂-manifolds, potentially eliminating the need for the Higgs boson in explaining mass.
A new theory called the quantum memory matrix proposes that spacetime is made of discrete cells that remember every interaction, potentially explaining phenomena like black holes, dark matter, and dark energy, and suggesting a cyclic universe with a finite informational age. The theory has been tested on quantum computers and offers a novel perspective on the universe as a cosmic memory bank and quantum computer.
Researchers at University College London propose a radical new theory suggesting that spacetime remains classical and unaffected by quantum mechanics, challenging the need to unify gravity and quantum physics by modifying Einstein's theory. Their approach could resolve longstanding paradoxes like black hole information loss and offers new experimental avenues to test the nature of spacetime, potentially transforming our understanding of the universe.
Researchers have successfully simulated the complete journey of a gravitational wave through a black hole's spacetime from the infinite past to the infinite future, providing new insights into wave scattering, energy transfer, and black hole vibrations, using advanced mathematical frameworks and custom software.
The article explains the significance of gravitational waves, first detected in 2015 by LIGO, confirming Einstein's general relativity. These ripples in spacetime are caused by massive cosmic events like black hole collisions, and studying them helps us understand the universe's most violent phenomena and its origins.
A new study suggests that black holes may be more unstable than previously thought, challenging the traditional Kerr solution model of General Relativity. Researchers found that energy accumulation within black holes could lead to significant instabilities, potentially altering our understanding of their internal dynamics and overall structure. This discovery opens new avenues for studying black holes and their implications for physics beyond General Relativity.
Researchers have discovered that the "wobble" of an accretion disk formed from a star ripped apart by a supermassive black hole can reveal the black hole's spin speed. This wobble, caused by the Lense-Thirring effect, was observed using NASA's NICER X-ray telescope. The findings suggest that the black hole involved in the event was spinning slower than expected, at less than 25% the speed of light. Future observations, particularly with the upcoming Vera C. Rubin Observatory, could provide more insights into the spin distribution and evolution of supermassive black holes.
Physicists have created a quantum tornado in superfluid helium, mimicking the behavior of black holes and offering a new way to study these elusive cosmic phenomena. This breakthrough allows for the observation of tiny surface waves with unprecedented precision and provides insights into the behavior of black holes, bridging the gap between theory and observation. The quantum tornado's ability to mimic the effects of a spinning black hole on curved spacetime has the potential to advance our understanding of black hole physics and predict quantum field behavior in curved spacetimes around astrophysical black holes.
Scientists have discovered that the supermassive black hole at the center of our galaxy, Sagittarius A*, is spinning at an extremely high rate, influencing its surroundings in significant ways. The rapid spin affects the formation of powerful jets of material and warps the fabric of spacetime around it. This discovery has far-reaching implications for understanding how black holes form, grow, and interact with their surroundings, as well as for testing theories of gravity in extreme environments.