All articles tagged with #spacetime
Vienna University of Technology researchers quantized the spacetime metric to derive the q-desic equation, showing that in a quantum spacetime particles need not follow classical geodesics; while deviations from ordinary gravity are vanishingly small, including the cosmological constant can produce noticeable differences at cosmological scales, potentially offering an observational path to test quantum gravity.
Vienna University of Technology researchers derive a q-desic equation by quantizing the spacetime metric in a simple gravitational field, predicting that quantum spacetime can subtly alter particle trajectories. The deviations are minuscule on small scales, but when the cosmological constant is included they become significant at cosmological distances, potentially offering an observable to test and distinguish quantum gravity theories using astronomical data.
A new theory proposes gravity is not fundamental but emerges from entropy, specifically quantum relative entropy, with spacetime acting as a quantum operator and a G-field linking matter and geometry. The approach aims to reconcile general relativity and quantum mechanics, potentially offering a fresh view on dark matter and the cosmological constant, though the idea remains unproven.
A new theory by physicist Ginestra Bianconi suggests gravity may emerge from entropy, potentially reconciling Einstein’s general relativity with quantum theory. By treating spacetime as a quantum operator and describing an entropic action that couples matter to geometry through a G-field, the framework aims to yield a small cosmological constant and offer a candidate explanation for dark matter. While intriguing, the idea remains speculative and requires substantial further work to confirm its viability as a unified theory of physics.
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.