Articles tagged with Spacetime
Gravastars may form when a star collapses under its own mass, triggering the creation of a mini universe with dark energy. This equilibrium stabilizes the object, preventing it from becoming a black hole.
A team of international researchers led by a UC Santa Barbara graduate student has confirmed a long-standing theory of stellar death by applying the principles of general relativity to a superluminous supernova. The discovery suggests that a magnetar, a rapidly spinning neutron star with a massive magnetic field, powers the supernova, ...
Researchers developed a unified framework to measure spacetime fluctuations, enabling clear targets for experiments. The study provides measurable signatures for different categories of fluctuations, expanding the possibilities for testing quantum-gravity predictions.
Astrophysicists used simulations to uncover the missing piece that previous studies had overlooked: magnetic fields. They found that strong magnetic fields can slow down a black hole and carry away some of its stellar mass, creating lighter and more slowly spinning black holes.
The institute aims to advance fundamental and applied science through interdisciplinary collaboration, with a focus on the unification of gravity and quantum theory. By pursuing the quantum-gravity crossover, researchers hope to develop new technologies and shape humanity's future.
A team of astronomers captured a detailed image of a ribbon-like jet emerging from the heart of OJ 287, revealing extreme energy and motion near the black hole. The study sheds new light on supermassive black holes and their powerful jets, potentially offering clues to binary black hole mergers.
Researchers have designed an optical device that functions as an optical black hole or white hole, behaving like a cosmic object that either swallows or repels light. This device relies on coherent perfect absorption of light waves and offers new possibilities for manipulating light-matter interactions.
A groundbreaking new framework unifies gravity from quantum relative entropy, bridging the gap between quantum mechanics and Einstein's general relativity. The theory predicts a small, positive cosmological constant aligning with experimental observations.
A new optical technology developed at UC Riverside enables gravitational-wave detectors to reach extreme laser powers, overcoming limitations that hinder the detection of cosmic phenomena. This breakthrough is expected to significantly expand our view of the universe, particularly in the earliest stages of its history.
Scientists have discovered a scrawny star and its fast-moving super-Neptune world, which sets a new record for the fastest exoplanet system. The planetary system is thought to move at least 1.2 million miles per hour.
The EHT Collaboration unveils a new analysis of the supermassive black hole at the heart of galaxy M87, combining observations from 2017 and 2018. The study confirms the presence of a luminous ring with a shifted brightest region, indicating turbulent accretion disk dynamics.
Brazilian researchers claim that in relativistic space-time, time is the fundamental constant that measures all physical quantities, eliminating the need for separate length and mass standards. High-precision clocks are sufficient to describe all quantities, even in Galilean space-time.
Researchers have developed a mathematical model that provides strong evidence for the cosmic censorship conjecture in three dimensions, suggesting singularities inside black holes will always be hidden. The model has implications for quantum gravity and advances efforts to understand thermodynamic properties of black holes.
A recent study examines the internal nature of black holes and their implications for astrophysical observations. The research reveals that dynamic black holes are subject to significant instability over short timescales, leading to deviations from known models.
Researchers at Würzburg University have developed a method to experimentally test the AdS/CFT correspondence, a central theory of quantum gravity. The approach uses a branched electrical circuit to mimic curved spacetime and demonstrates that it can realize gravitational dynamics.
A recent study reveals that hippocampal CA1 neurons integrate spatial and temporal information through a shared representation mechanism, facilitating episodic memory formation. This discovery provides essential insights into the neural basis of spatiotemporal context signals in episodic memory.
Simulations predict that the violent deaths of rapidly rotating stars can create detectable gravitational waves, which could aid understanding of collapsars and black holes. The signals from these events are strong enough to be picked up by LIGO and may already exist in datasets.
A new study published in Physical Review Letters suggests that nanohertz gravitational waves may not originate from supercool first-order phase transitions. Researchers found that such transitions would struggle to complete, shifting the frequency of the waves away from nanohertz frequencies.
Researchers propose that simple forms of ultra-light scalar field matter could generate detectable gravitational wave backgrounds soon after the Big Bang. This discovery could shed light on dark matter and its role in the universe's mass, offering a new avenue for fundamental physics research.
Researchers suggest microscopic, ultradense black holes formed in first quintillionth of a second after Big Bang may have produced smaller, super-charged black holes with unprecedented nuclear charge. These tiny, 'super-charged' black holes could have influenced atomic nucleus formation and detection.
Astronomers have discovered a massive, wave-shaped structure in the Milky Way, which is oscillating through space-time. The Radcliffe Wave is approximately 9,000 light years long and moves like a traveling wave, with star clusters along its path moving up and down.
A new theory unifies gravity and quantum mechanics by preserving Einstein's classical concept of spacetime, proposing random fluctuations in spacetime that can be verified experimentally. The theory challenges the pursuit of a quantum theory of gravity, offering an alternative approach to reconcile the two fundamental theories.
A novel AI system developed by City University of Hong Kong improves predictive accuracy in dense traffic, reducing latency and increasing efficiency. QCNet achieves speed and accuracy in predicting road users' movements, even with long-term predictions, making autonomous driving safer and more human-like.
Researchers report evidence of a cosmic background of gravitational waves likely produced by the merger of supermassive black hole binaries. The signal is detected through millisecond pulsar observations and has implications for our understanding of the universe's large-scale structure.
Researchers from West Virginia University have made a groundbreaking discovery by detecting evidence of low-frequency gravitational waves, which can only be perceived with a detector much larger than the Earth. The signal was detected using pulsar timing arrays and has significant implications for understanding spacetime dynamics.
A team of researchers using radio telescope observations found evidence of gravitational waves passing through the Milky Way, causing spacetime distortions that appear as variations in pulsar ticking rates. The discovery provides insights into how galaxies evolve and supermassive black holes grow and merge.
Researchers with the NANOGrav collaboration have detected the gravitational wave background for the first time, revealing a perpetual chorus of ripples in space-time. The discovery is made possible by observing stars called pulsars that act as celestial metronomes.
The NANOGrav team has detected a collective hum of gravitational waves from merging supermassive black holes, providing evidence for a background undulation in spacetime. The signal is thought to be generated by huge black holes at galaxy centers, producing low-frequency gravitational waves that oscillate slowly over years and decades.
Researchers have developed a quantum simulator to study curved spacetime, demonstrating phenomena such as gravitational lensing effects in atomic clouds. This new tool provides a deeper understanding of the connection between relativity and quantum theory.
Researchers from HKUST and CityU developed a metasurface to generate time-varying OAM beams with a time-dependent phase profile. This allows for a higher-order twist in the envelope wavefront structure, increasing capacity for applications such as dynamic particle trapping and information encryption.
University of Central Florida researchers observed de Broglie-Mackinnon wave packets, a long-standing theoretical concept, by exploiting a loophole in 1980's-era laser physics theorem. The team's use of space-time wave packets, which resist stretching in dispersive media, verifies predicted properties and opens the path to studying top...
Researchers from Warsaw and Oxford propose a new theoretical framework that incorporates three time dimensions and one spatial dimension. This concept allows for the description of phenomena in a world with superluminal observers, which could potentially exist.
A new space-time coding antenna developed at City University of Hong Kong enables manipulation of beam direction, frequency, and amplitude for improved user flexibility in 6G wireless communications. The antenna relies on software control and combines research advances in leaky-wave antennas and space-time coding techniques.
According to new research led by the University of Bath, some short-duration gamma-ray bursts are triggered by the birth of supramassive stars, not black holes. This discovery may offer a new way to locate neutron star mergers and gravitational wave emitters.
A team of researchers led by Francesco Fedele investigated the extreme sea states and potential hazards for ship navigation in the eastern Mediterranean. They developed a novel theory of space-time wave extremes, indicating that rogue waves do not 'steal' energy from neighboring waves.
Researchers have developed a new model that combines nuclear physics and string theory to describe the transition to dense and hot quark matter in neutron star collisions. The model allows for the calculation of gravitational-wave signals, showing that both hot and cold quark matter can be produced.
Physicists have measured Albert Einstein's theory of general relativity at the smallest scale ever, demonstrating time dilation effects between two tiny atomic clocks separated by just a millimeter. The experiments suggest a way to make atomic clocks 50 times more precise than today's best designs.
A researcher developed a computer simulation to predict asteroid impacts and study crater formation. The simulation, built using NASA-designed methods, can generalize results to all metal asteroid impacts.
A team of international researchers challenged Einstein's theory of general relativity using pulsars as a cosmic laboratory. They detected new relativistic effects, including light deflection and time dilation, with unprecedented precision. The study provides significant insights into gravity theories and the fundamental forces of nature.
Theoretical physicists modelled the region around M87's supermassive black hole, confirming that gravity plays a key role in accelerating particles out to thousands of light years. The findings provide further evidence for Einstein's theory of general relativity and its application to astrophysical phenomena.
A nearly $2 million NSF grant will accelerate the hunt for low-frequency gravitational waves using high-precision timing observations of exotic stars called millisecond pulsars. WVU's Maura McLaughlin is principal investigator on the project, which aims to discover new types of gravitational waves and expand the IPTA's reach globally.
A Penn State scientist has developed a new mathematical formula that may solve the decades-old problem of spacetime in Einstein's theories of relativity. By placing space and time on an equal footing, Gopalan's approach removes the negative sign problem, allowing for traditional Euclidean geometry to be applied.
The study determines that the ALT rotational transformation accurately describes the relativistic effects in rotating frames, revealing a fundamental framework for spacetime. The results confirm length contraction and time dilation within an absolute simultaneity framework.
Scientists quantify space-time nonseparability of electromagnetic pulses using quantum state tomography and calculate fidelity, concurrence, and entanglement. They propose novel concepts for measuring space-time entanglement in structured light, opening new avenues for ultrahigh-capacity communication and high-security encryption.
Researchers develop theoretical model suggesting microscopic wormholes could be traversable without exotic matter, using Dirac field to describe probability density function of particles. The model proposes that certain elementary particles like electrons and electromagnetic waves could traverse tiny tunnels in spacetime.
A new theory of causality in quantum theory proposes cyclic causal loops, challenging classical intuitions. The study offers a novel understanding of exotic processes with indefinite causal order, which can be explained through unitary transformations.
Researchers from the Event Horizon Telescope collaboration used the first horizon-scale image of a black hole to test general relativity, deepening understanding of black holes and ruling out many alternatives. The study found that the size of the black hole shadow corroborates the predictions of general relativity.
Researchers have developed a new type of laser beam that doesn't follow long-held principles about how light refracts and travels. The beams, known as spacetime wave packets, can be arranged to behave in the usual manner, not changing speed at all, or even speeding up in denser materials.
Researchers used femtosecond laser direct write technology to simulate curved space-time near a black hole. They observed accelerated single-photon wave packets and fermion pairs escaping the black hole, mimicking Hawking radiation. This experiment demonstrates the potential for quantum simulation in studying general relativity.
Scientists tested the symmetry of space-time by comparing two atomic clocks, confirming their excellent accuracy and a fundamental hypothesis of the theory of relativity. The experiment improved the limits for testing space-time symmetry by a factor of 100.
Some physicists argue that spacetime may emerge from processes closer to reality, such as quarks and hadrons. The concept of spacetime has puzzled humanity for millennia, with some theories suggesting it's a dynamic creation while others propose it's an absolute arena for events.
Researchers used mathematical abstraction to describe gravitational waves as functions that remain invariant during distribution. They found arbitrary functions can be set to encode information, allowing for spatial transmission without distortions.
Researchers at the University of Kansas are developing a new technology called Space Time Coding to improve long-range communications for testing airborne vehicles. The goal is to enable more efficient data transmission over narrower frequencies, enabling entities like the Department of Defense to test aircraft on government ranges.
Researchers at Monash University have identified a new concept called 'orphan memory,' which challenges current understanding of gravitational waves. They found that high-frequency waves leave behind a signature that LIGO can detect.
Ben Tippett's research uses Einstein's theory of general relativity to propose a method for time travel. By curving space-time into a circle, he suggests that time can be bent and travelers can move backward in time. However, the use of exotic matter is still needed to make this concept a reality.
The winners of the 2016 Kavli Prize in Astrophysics reveal their 40-year journey to detect gravitational waves. They share their insights on the challenges and breakthroughs in eavesdropping on space-time ripples, which have captured the world's imagination.
Physicists have long struggled to reconcile classical physics and quantum mechanics. New research by Stefano Liberati and colleagues proposes a scenario that preserves special relativity while introducing non-local effects. The model suggests space-time becomes granular at tiny scales, allowing for experimental testing of its predictions.
Physicists at Université de Genève developed a new code that simulates the rotation of space-time and gravitational waves in the formation of large-scale structures. This allows for more precise calculations than current codes, enabling the study of dark energy's role in the universe's expansion.
Theorists have shown that particles of different energies sense slightly modified versions of spacetime, leading to a phenomenon similar to a rainbow. This discovery suggests that the structure of spacetime sensed by individual particles depends on their energy.
Researchers found black holes exist in gravitational theories with broken Lorentz invariance due to universal horizons, which prevent infinite speeds. Universal horizons act like cosmic boundaries that particles can move around but cannot escape, resolving a long-standing paradox.