Articles tagged with General Relativity
Comprehensive exploration of living organisms, biological systems, and life processes across all scales from molecules to ecosystems. Encompasses cutting-edge research in biology, genetics, molecular biology, ecology, biochemistry, microbiology, botany, zoology, evolutionary biology, genomics, and biotechnology. Investigates cellular mechanisms, organism development, genetic inheritance, biodiversity conservation, metabolic processes, protein synthesis, DNA sequencing, CRISPR gene editing, stem cell research, and the fundamental principles governing all forms of life on Earth.
Comprehensive medical research, clinical studies, and healthcare sciences focused on disease prevention, diagnosis, and treatment. Encompasses clinical medicine, public health, pharmacology, epidemiology, medical specialties, disease mechanisms, therapeutic interventions, healthcare innovation, precision medicine, telemedicine, medical devices, drug development, clinical trials, patient care, mental health, nutrition science, health policy, and the application of medical science to improve human health, wellbeing, and quality of life across diverse populations.
Comprehensive investigation of human society, behavior, relationships, and social structures through systematic research and analysis. Encompasses psychology, sociology, anthropology, economics, political science, linguistics, education, demography, communications, and social research methodologies. Examines human cognition, social interactions, cultural phenomena, economic systems, political institutions, language and communication, educational processes, population dynamics, and the complex social, cultural, economic, and political forces shaping human societies, communities, and civilizations throughout history and across the contemporary world.
Fundamental study of the non-living natural world, matter, energy, and physical phenomena governing the universe. Encompasses physics, chemistry, earth sciences, atmospheric sciences, oceanography, materials science, and the investigation of physical laws, chemical reactions, geological processes, climate systems, and planetary dynamics. Explores everything from subatomic particles and quantum mechanics to planetary systems and cosmic phenomena, including energy transformations, molecular interactions, elemental properties, weather patterns, tectonic activity, and the fundamental forces and principles underlying the physical nature of reality.
Practical application of scientific knowledge and engineering principles to solve real-world problems and develop innovative technologies. Encompasses all engineering disciplines, technology development, computer science, artificial intelligence, environmental sciences, agriculture, materials applications, energy systems, and industrial innovation. Bridges theoretical research with tangible solutions for infrastructure, manufacturing, computing, communications, transportation, construction, sustainable development, and emerging technologies that advance human capabilities, improve quality of life, and address societal challenges through scientific innovation and technological progress.
Study of the practice, culture, infrastructure, and social dimensions of science itself. Addresses how science is conducted, organized, communicated, and integrated into society. Encompasses research funding mechanisms, scientific publishing systems, peer review processes, academic ethics, science policy, research institutions, scientific collaboration networks, science education, career development, research programs, scientific methods, science communication, and the sociology of scientific discovery. Examines the human, institutional, and cultural aspects of scientific enterprise, knowledge production, and the translation of research into societal benefit.
Comprehensive study of the universe beyond Earth, encompassing celestial objects, cosmic phenomena, and space exploration. Includes astronomy, astrophysics, planetary science, cosmology, space physics, astrobiology, and space technology. Investigates stars, galaxies, planets, moons, asteroids, comets, black holes, nebulae, exoplanets, dark matter, dark energy, cosmic microwave background, stellar evolution, planetary formation, space weather, solar system dynamics, the search for extraterrestrial life, and humanity's efforts to explore, understand, and unlock the mysteries of the cosmos through observation, theory, and space missions.
Comprehensive examination of tools, techniques, methodologies, and approaches used across scientific disciplines to conduct research, collect data, and analyze results. Encompasses experimental procedures, analytical methods, measurement techniques, instrumentation, imaging technologies, spectroscopic methods, laboratory protocols, observational studies, statistical analysis, computational methods, data visualization, quality control, and methodological innovations. Addresses the practical techniques and theoretical frameworks enabling scientists to investigate phenomena, test hypotheses, gather evidence, ensure reproducibility, and generate reliable knowledge through systematic, rigorous investigation across all areas of scientific inquiry.
Study of abstract structures, patterns, quantities, relationships, and logical reasoning through pure and applied mathematical disciplines. Encompasses algebra, calculus, geometry, topology, number theory, analysis, discrete mathematics, mathematical logic, set theory, probability, statistics, and computational mathematics. Investigates mathematical structures, theorems, proofs, algorithms, functions, equations, and the rigorous logical frameworks underlying quantitative reasoning. Provides the foundational language and tools for all scientific fields, enabling precise description of natural phenomena, modeling of complex systems, and the development of technologies across physics, engineering, computer science, economics, and all quantitative sciences.
The absence of exoplanets orbiting tight binary stars is attributed to the effects of general relativity, which causes gravitational tugs from the stars to make a planet's orbit precess. This process makes it difficult for close-in planets to survive, with 75% being destroyed due to tidal disruptions or ejection from the system.
Researchers have shown that quantum collapse models, which challenge standard quantum theory, imply a fundamental limit on clock precision due to tiny intrinsic uncertainty in time. This means modern timekeeping technologies are entirely unaffected by such uncertainty.
Physicists at NIST have calculated the precise time difference between Earth and Mars, taking into account Martian surface gravity and its eccentric orbit. The clocks on Mars will tick 477 microseconds faster per day, affecting future space missions such as navigation and communication.
The international collaboration has detected a significant fraction of gravitational signals, constituting two-thirds of approximately 350 signals detected to date. The analysis of the data has led to numerous new discoveries and a deeper understanding of compact binary systems and fundamental physical processes in the universe.
A new study from UBC Okanagan has mathematically proven that the fundamental nature of reality operates in a way that no computer could simulate. The researchers demonstrate that a complete and consistent description of everything requires non-algorithmic understanding, which is beyond algorithmic computation.
Researchers at Goethe University Frankfurt used complex simulations to study the origin of powerful jets emitted by black holes. They discovered that magnetic reconnection is involved in extracting rotational energy and powering these jets.
UC Riverside-developed FROSTI system allows precise control of laser wavefronts at extreme power levels, opening a new pathway for gravitational-wave astronomy. This technology expands the universe's view by a factor of 10, potentially detecting millions of black hole and neutron star mergers with unmatched fidelity.
The latest gravitational wave observation reveals two black holes with masses 30 times that of the Sun, shattering previous expectations. This discovery confirms a longstanding theory by Stephen Hawking and opens new possibilities for testing our understanding of gravity.
The LIGO–Virgo–KAGRA Collaboration has used the sharpest gravitational wave signal to precisely test Hawking's area theorem and confirm the remnant black hole's nature. The detection confirms that the surface area of the remnant increased, consistent with Hawking's prediction.
The LIGO-Virgo-KAGRA Collaboration has detected GW250114, a clear gravitational wave signal confirming two long-standing theories. The study validates Professor Stephen Hawking's prediction that the total event horizon area of black holes cannot shrink and confirms the Kerr nature of black holes.
A newly detected black hole merger has provided the clearest evidence yet of how black holes work, confirming fundamental predictions by Albert Einstein and Stephen Hawking. The observations reveal insights into the properties of black holes and the nature of space-time, hinting at how quantum physics and general relativity fit together.
Researchers verified Stephen Hawking's Black Hole Area Theorem using gravitational waves, confirming the total surface area of black holes increases when they merge. This detection provides evidence for a fundamental law in physics, demonstrating the power of gravitational-wave astronomy.
Researchers use numerical relativity to probe the universe's biggest questions, including the Big Bang, cosmic inflation, and multiverse theories. The method allows for exploration of extreme situations beyond current mathematical limits.
An interstellar mission to test astrophysical black holes is proposed by Cosimo Bambi, harnessing nanocrafts and laser beams to gather data on nearby black holes. The mission aims to answer pressing questions in physics, including the nature of event horizons and general relativity.
A University of Alaska Fairbanks professor has proposed a new three-dimensional time theory that could help solve some of the biggest questions in physics. The theory argues that time comes in multiple dimensions rather than just one, and space emerges as a secondary manifestation.
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.
Physicists have discovered a new theoretical framework called supermazes that redefine the concept of black holes, providing a more universal picture of their microstructure. Supermazes are based on string theory and offer a detailed portrait of the microscopic structure of brane black holes.
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.
Researchers suggest that gravitational collapse in the early universe could give rise to incredibly dense point-like objects, namely visible or naked singularities. This ultra-strong gravity condition provides a unique opportunity to probe new fundamental aspects of physics, including quantum gravity. The possibility of PNaSs accountin...
A team of physicists has validated string theory by developing an innovative mathematical method that points to its inevitability. This breakthrough uses the bootstrap principle to show that string theory is the only consistent answer for scattering amplitudes, bringing researchers closer to understanding the universe.
The DESI collaboration has released a new analysis of its data, weighing in on the standard model of gravity. The results reveal that galaxies cluster consistent with Einstein's general theory of relativity, providing precise tests of gravity at large scales.
Researchers have traced how galaxies cluster across 11 billion years using the Dark Energy Spectroscopic Instrument (DESI), providing the most precise test of gravity at very large scales. The study's results validate Einstein's theory of general relativity and limit possible theories of modified gravity.
The Crab Pulsar features a unique zebra pattern due to diffraction in the electromagnetic pulses caused by its dense plasma. Researchers have proposed various emission mechanisms, but none have convincingly explained the observed patterns until now.
A French-Swiss team has discovered a slight discrepancy between Einstein's predictions and measurements of gravitational lensing from the Dark Energy Survey. The study found that the depth of gravitational wells varied with cosmic history, challenging the validity of Einstein's theories for explaining phenomena beyond our solar system.
The European Research Council awards €12M to GWSky project, led by SISSA, to develop innovative tools for interpreting gravitational wave signals with great precision. The project aims to identify and understand possible anomalies in the signals, revealing new physical phenomena not predicted by Einstein's theory of General Relativity.
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.
Scientists at University of Tsukuba have discovered the first evidence of precession in ultraluminous accretion disks due to a black hole's spin. This phenomenon causes periodic fluctuations in luminosity and affects the direction of emitted radiation, shedding light on the influence of BH spin on cosmic phenomena.
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.
Research by the University of Warsaw and Oxford has shown that tachyons, previously thought to contradict special relativity, can actually aid in its understanding. The study reveals that tachyon theory becomes mathematically consistent when incorporating both initial and final states.
Scientists at Case Western Reserve University have discovered that the rotation curves of galaxies remain flat for millions of light years, defying expectations and challenging traditional understanding of cosmology. This finding suggests that dark matter may not exist or that alternative gravity theories could explain this phenomenon.
Researchers found that a photon's polarization is topological, meaning it doesn't change as it moves through materials and environments. This property can help design better light beams for heating and measuring plasma, which could increase fusion efficiency.
Physicists from TU Darmstadt propose a new approach to define and measure the time required for quantum tunneling. They suggest using Ramsey clocks, which utilize the oscillation of atoms to determine the elapsed time. The proposed method may correct previous experiments that observed particles moving faster than light during tunneling.
Researchers discovered a 'cosmic glitch' in the universe's gravity, explaining strange behavior on a cosmic scale. The new model modifies Einstein's general relativity, resolving inconsistencies without affecting existing uses.
Researchers have discovered a star orbiting a massive black hole 33 times heavier than the sun's mass, located 1500 light-years away from Earth. The binary system Gaia BH3 contains an ordinary star that seems to have formed over ten billion years ago.
A massive ancient galaxy, JWST-ER1g, has been found to have a high dark matter density, puzzling physicists. Researchers offer an explanation that suggests a mechanism compressing the dark matter halo could be responsible for the high density.
Researchers from the DESI collaboration have created a largest 3D map of cosmos ever constructed, measuring expansion history with precision better than 1%. The analysis confirms basics of Lambda-CDM model but hints at possible evolution of dark energy over time.
The American Physical Society's 2024 April meeting will feature approximately 1,700 presentations on various physics topics. The scientific program includes a public lecture on detecting gravitational waves with LISA and a special symposium on big questions for the next decade.
Physicists at the University of Southampton successfully detect weak gravitational pull on microscopic particles using a new technique. The experiment, published in Science Advances, could pave the way to finding the elusive quantum gravity theory.
Researchers found an unknown object orbiting a rapidly spinning millisecond pulsar, weighing more than the heaviest neutron stars and less than the lightest black holes. The discovery was made using the MeerKAT Radio Telescope and could reveal new insights into black holes and neutron stars.
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 team of Princeton astrophysicists has conclusively determined that the energy close to the event horizon of black hole M87* is pushing outward, not inward. This finding resolves a longstanding debate within the field and provides new insights into the behavior of black holes.
Researchers developed an accelerating wave equation to solve daily phenomena, revealing a well-defined direction of time. The framework also predicts energy conservation in certain situations, including exotic materials.
Researchers confirmed that antimatter falls under the influence of gravity, ruling out gravitational repulsion as a cause for its absence in the universe. The study used an antihydrogen experiment to observe individual atoms taking a downward path, providing a definitive answer to long-standing questions about antimatter's behavior.
Researchers have found that studying the mass and movement of the Andromeda galaxy and the Milky Way could help place an upper limit on the value of dark energy. The technique may provide valuable insights into the mysterious force, but it is not yet a direct detection.
A team from Leibniz University Hannover and University of Bremen confirmed the equivalence principle, proving passive and active gravitational mass are always equivalent, regardless of composition. This finding contradicts quantum theory's prediction of a violation, with accuracy 100 times greater than previous studies.
Researchers used quasar data to analyze time dilation in the early universe, confirming that it was running at five times slower. By observing nearly 200 quasars, scientists were able to standardize their 'ticking' and chart the expansion of space.
A recent study from SISSA suggests that dark matter interacts with gravity in a non-local way, providing a fresh perspective on its nature. The new model, which employs fractional calculus, accurately describes the motion of stars in smaller galaxies.
Researchers from UNIGE have developed a new method to test the validity of Einstein and Euler's theories on the accelerating Universe expansion and dark matter. The study uses time distortion as a never-before-used measure, allowing for differentiation between the two equations.
A team of scientists from Kyoto University has confirmed that galaxy alignments can be a powerful probe for dark matter and dark energy. The analysis of 1.2 million galaxy observations verified general theory of relativity at vast spatial scales, providing strong evidence for gravity's role in shaping the universe.
Researchers from the Atacama Cosmology Telescope collaboration have created a groundbreaking new image that reveals the most detailed map of dark matter distributed across a quarter of the entire sky. The study confirms Einstein's theory of how massive structures grow and bend light, supporting the standard model of cosmology.
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 propose a new interpretation of dark energy, linking zero-point fluctuations to polarisability of the vacuum. This leads to an energy density that can be calculated and matches measured values for the cosmological constant.
A team of cosmologists has reconstructed gravity to find a more robust way of understanding the cosmos, using new observational data from space and ground-based telescopes. The study explores whether modifying General Relativity could help resolve open problems in cosmology, with promising results that could pave the way for resolving ...
The book delves into the concept of emergence in two domains: condensed matter physics and quantum gravity. It reveals surprising connections between seemingly disparate areas of physics, shedding light on how mysterious materials work and the origins of space and time.
The Event Horizon Telescope collaboration successfully captured an image of the black hole at the center of our galaxy, a major breakthrough in astrophysics. This achievement will enable scientists to test fundamental predictions of general relativity and gain insights into the formation and evolution of galaxies.
The MICROSCOPE satellite has confirmed the equivalence principle with unprecedented accuracy, supporting Einstein's general relativity. The result shows that any deviation in acceleration is less than 1 part in 10^15, ruling out some candidate universal theories of physics.
Researchers from the MICROSCOPE mission presented the most precise test yet of the Weak Equivalence Principle, a key component of general relativity. They found no violation of the principle, setting the most stringent constraints on gravity and time.
Researchers build on Peter Bergmann and Arthur Komar's work using Hamilton-Jacobi techniques to resolve the ambiguity in time development, a key challenge in reconciling general relativity with quantum mechanics. This approach deserves more recognition for its potential to lead to an eventual theory of quantum gravity.
Scientists at Kyoto University propose a novel approach using holograms to approximate the universe's expansion in de Sitter space. The model uses conformal field theory and a positive integer for the cosmological constant, enabling the identification of the first example of two-dimensional CFT.
A machine learning algorithm has outperformed astronomers in analyzing microlensing data to find new exoplanets, revealing connections hidden in complex mathematics from general relativity. The AI algorithm uncovered a degeneracy that had been missed by experts, suggesting a broader theory is likely incomplete.