Quantum Gravity
Articles tagged with Quantum Gravity
Does gravity follow the rules of quantum mechanics?
A team of researchers led by Kazuhiro Yamamoto has proposed a method to create a momentum-squeezed state in movable mirrors, which significantly broadens the quantum superposition of a mirror's position. This approach can amplify the signal of quantum entanglement generated by gravity, making it easier to detect.
Quantum researchers engineer extremely precise phonon lasers
Researchers at the University of Rochester have developed a squeezed phonon laser that precisely controls individual particles of vibration or sound, allowing for accurate measurements of gravity and other forces. This technology has the potential to create more accurate, 'unjammable' navigation systems without relying on satellites.
New theory reshapes quantum view of Big Bang
Researchers at the University of Waterloo have developed a new theory that suggests the universe's rapid early expansion could emerge naturally from a deeper, more complete theory of quantum gravity. This approach offers a unified picture that connects the earliest moments of the universe to modern cosmology.
VIP-2 experiment narrows the search for exotic physics beyond the Pauli exclusion principle
The VIP-2 experiment, a highly sensitive test of the Pauli exclusion principle, found no evidence of its violation. The team set the strongest limits yet on possible violations involving electrons in atomic systems, constraining speculative theories beyond the Standard Model.
We have no idea what most of the universe is made of, but scientists are closer than ever to finding out
Researchers at Texas A&M University are building highly sensitive detectors to explore dark matter and energy. The team's work builds on previous breakthroughs in detecting low-mass particles, and they aim to find ways to amplify signals that were previously buried in noise.
A new approach links quantum physics and gravitation
Researchers at TU Wien have developed a new approach to unifying quantum physics and general relativity theory, discovering striking deviations from previous results. The approach uses geodesics and quantized metric to make predictions for measurable quantities.
Delta.g appoints current Chair of Serendipity Capital and former HSBC Holdings Group CFO Ewen Stevenson as Chair of the Board
Delta.g appoints Ewen Stevenson as Chair of its Board, bringing experience in financial governance and strategic transformation to support the company's growth. The appointment follows a £4.6 million oversubscribed seed round led by Serendipity Capital.
Freely levitating rotor spins out ultraprecise sensors for classical and quantum physics
A macroscopic device has been designed to reduce eddy-current damping, allowing for precise measurements of physical phenomena like gravity. The system uses a graphite disk and rare earth magnets, enabling ultra-precise sensors that can be used in classical and quantum physics research.
Delta.g secures £4.6 million in oversubscribed seed round to advance quantum sensing
Delta.g, a UK-based quantum technology company, has raised £4.6 million in an oversubscribed seed round to accelerate the development and deployment of its gravity sensing platform. The platform directly tackles gaps in spatial intelligence, delivering high-resolution data for infrastructure, transportation, and dual-use cases.
Bridging Worlds: USU physicists develop novel test of the Holographic Principle
Researchers create framework to describe fundamental physics principles in both realms, providing key component for reconciling theories. The holographic principle is a crucial model to predict effects of quantum gravity, enabling theoretical physicists to make accurate predictions.
Deep in the Mediterranean, in search of quantum gravity
A study published in JCAP has established upper limits on the strength of quantum gravity effects on neutrino oscillations, providing valuable insights into the long-sought theory. The results show no signs of decoherence, a phenomenon that could be a key indicator of quantum gravity's presence.
Gravity from entropy: A radical new approach to unifying quantum mechanics and general relativity
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.
Primordial naked singularities: Nature’s quantum gravity laboratories pervading the universe?
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...
New model advances our understanding of quantum black holes
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.
Professor Ruth Britto among four researchers to secure €10 million ERC Synergy Grant
Professor Ruth Britto and her international team will develop new algorithmic methods with applications in mathematics, particle physics, and gravity. They aim to tackle longstanding computational bottlenecks and push the boundaries of numerous areas of theoretical physics.
Würzburg physics team electrifies the quantum world
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.
New research suggests a way to capture physicists’ most wanted particle—gravitons
Researchers propose a solution to detect single gravitons, the quantum building blocks of gravity, using an acoustic resonator and improved energy state-detection methods. The team's experiment, similar to the photo-electric effect, relies on observing quantum jumps in material to deduce graviton absorption.
Purdue physicists throw world’s smallest disco party
Physicists at Purdue University have achieved a groundbreaking milestone in levitated optomechanics by observing the Berry phase of electron spins in nano-sized diamonds. By levitating and spinning these tiny diamonds at incredibly high speeds, they were able to study the effects of fast rotation on spin qubits.
Can quantum particles mimic gravitational waves?
Scientists have developed a method to simulate gravitational waves in the lab using cold atoms, a phenomenon similar to gravitational waves. This breakthrough allows for easier study and understanding of these cosmic waves, which are challenging to detect.
Searching for dark matter with the coldest quantum detectors in the world
Researchers at Lancaster University and others are building the most sensitive dark matter detectors using quantum technologies. They aim to detect dark matter particles weighing between 0.01 to a few hydrogen atoms, which could reveal the mass and interactions of these mysterious particles.
Precision instrument bolsters efforts to find elusive dark energy
Researchers have built the most precise experiment yet to look for gravitational anomalies caused by dark energy, using a lattice atom interferometer that can hold atoms in place for up to 70 seconds. While no deviation from predicted theory was found, the improved precision opens up possibilities for probing gravity at the quantum level.
Toward testing the quantum behavior of gravity: A photonic quantum simulation
A team of researchers successfully demonstrated the principles of gravity-mediated entanglement in a photonic quantum simulation. This breakthrough provides crucial insights into the nature of gravity and its interaction with quantum mechanics.
UTA scientists test for quantum nature of gravity
Researchers at UTA used ultra-high energy neutrino particles to search for signatures of quantum gravity, but found no evidence of expected quantum gravitational effects. This non-observation represents a powerful statement about the still-unknown physics operating at the interface of quantum physics and general relativity.
Revealing the quantumness of gravity
Researchers propose an experiment to test the quantum nature of gravity without relying on entanglement. By using massive harmonic oscillators, they aim to reveal the quantumness of gravity in a way that was previously challenging due to the difficulty in creating heavy mass states.
Scientists on the hunt for evidence of quantum gravity’s existence at the South Pole
A team from the University of Copenhagen contributed to an Antarctic experiment studying neutrinos, which may hold the answer to whether gravity also exists at the quantum level. The study found no conclusive changes in neutrino properties, but the results do not exclude the possibility of quantum gravity.
Scientists closer to solving mysteries of universe after measuring gravity in quantum world
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.
New theory unites Einstein’s gravity with quantum mechanics
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.
Does antimatter fall up or down? Physicists observe the first gravitational free-fall of antimatter
The Antihydrogen Laser Physics Apparatus (ALPHA) collaboration has measured gravity's effect on antimatter for the first time, confirming it falls downwards. This breakthrough could help explain the universe's lack of antimatter.
USTC explored gravity's effect on quantum spins
A joint USTC research group investigated the coupling effect between neutron spin and gravitational force using a high-precision xenon isotope magnetometer. The experimental results revealed that the weight difference between the neutron's spin-up and spin-down states was less than two sextillionths.
Unveiling quantum gravity: New results from IceCube and Fermi data
Researchers have found preliminary evidence supporting quantum gravity models that predict an energy-dependent reduction in speed of ultrarelativistic particles. This effect, expected to be small, has been observed in gamma-ray bursts and ultra-high-energy neutrinos detected by Fermi and IceCube telescopes.
Curved spacetime in a quantum simulator
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.
Scientists find a common thread linking subatomic color glass condensate and massive black holes
Physicists discover correspondence between dense states of gluons and enormous black holes, both characterized by self-interacting force carrier particles. The study reveals universal limits on entropy and information content in these systems.
Quantum sensing in outer space: New NASA-funded research will build next-gen tech to better measure climate
Researchers will develop new technology and tools to improve climate factor measurement by observing atoms in outer space. The team's goal is to enable unprecedented science measurements, such as sea level rise and ice melt rates.
Underground Italian lab searches for signals of quantum gravity
Physicists search for signs of radiation produced by a violation of the Pauli exclusion principle, which determines electron arrangement in atoms. No evidence of violation has been found so far, ruling out some quantum-gravity models.
Physicists observe wormhole dynamics using a quantum computer
Researchers have developed a quantum experiment that allows them to probe connections between theoretical wormholes and quantum physics. The study demonstrates the equivalence of wormholes with quantum teleportation, a process experimentally demonstrated over long distances.
From Graphene to Gravity: Exploring the Physics of Emergence
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.
Our brains use quantum computation – new research
Researchers at Trinity College Dublin discovered that quantum computation may be used by the human brain, correlating with short-term memory performance and conscious awareness. This finding could enhance our understanding of brain functions and potentially lead to innovative technologies.
MICROSCOPE mission presents most precise test of general relativity’s weak equivalence principle
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.
A step towards quantum gravity
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.
A quantum wave in two crystals
A team of scientists has successfully built a neutron interferometer using two separate crystals, a major breakthrough in quantum physics. This achievement opens up new possibilities for quantum measurements and research on quantum effects in a gravitational field.
Quantum information theory: Quantum complexity grows linearly for an exponentially long time
Researchers proved a conjecture on quantum complexity growth, contradicting the Brown-Susskind intuition that complexity increases linearly for astronomically long times and then remains maximum. Instead, complexity grows linearly with time until it saturates at an exponential point related to system size.
New research discovers link between disparate approaches to quantum gravity
Researchers discover a connection between two approaches to quantum gravity, finding that one directly implies the other. This link challenges long-held distinctions and suggests all theories of quantum gravity are holographic.
Mathematical discovery could shed light on secrets of the Universe
Researchers at Chalmers University of Technology have discovered a simplified model for quantum gravity called the 'holographic principle' that describes how gravity emerges from quantum mechanics. This breakthrough may also offer new insights into mysterious dark energy.
Sensor breakthrough announced in Nature paves way for groundbreaking map of world under Earth surface
Researchers from the University of Birmingham have successfully used a quantum gravity gradiometer to detect an object hidden below ground, marking a significant milestone in the development of this technology. The breakthrough could lead to faster, cheaper, and more comprehensive underground mapping, with potential applications in ind...
From burglar alarms to black hole detectors
Physicists propose an experiment using entangled quantum systems in free fall to detect movements and test if gravity is a quantum phenomenon. The system can also be used to detect space debris, tectonic movements, and burglars, with potential applications for early earthquake warnings and movement sensors.
An atom chip interferometer that could detect quantum gravity
Researchers created an atom chip interferometer that can detect quantum gravity effects by studying interference patterns between atoms. The device has the potential to prove whether gravity is a quantum phenomenon.
Quantum collaboration gives new gravity to the mysteries of the universe
An international team of experts has demonstrated that only quantum gravity can create a specific ingredient needed for quantum computation. The proposed experiment involves cooling billions of atoms to extremely low temperatures and applying a magnetic field, which would reveal the underlying gravity if it's quantum.
Placing cosmological constraints on quantum gravity phenomenology
Researchers have used cosmological observations to constrain a quantum gravity model, disproving the linear version. The quadratic model is placed under tighter scrutiny, with stricter bounds compared to quantum experiments.
Weak equivalence principle violated in gravitational waves
Research reveals that quantum particles can break a key principle of classical physics when passing through gravitational waves, opening up new possibilities for advanced materials and devices. This finding has significant implications for the development of gravitational wave detectors and potential energy harvesting technologies.
A stepping stone for measuring quantum gravity
A group of physicists has proposed a 'table-top' device that could measure gravity waves and determine if gravity is a quantum phenomenon. The device uses a tiny diamond in quantum superposition to detect gravitational waves and create an interference pattern.
'Quantum negativity' can power ultra-precise measurements
Scientists have found that quantum particles can carry unlimited information about interacted objects, enabling precise measurements. Researchers developed a new technique using quasi-probabilities to improve metrology, leading to potential breakthroughs in super-precise microscopes and quantum computers.
Deconstructing Schrödinger's cat
Laloë's theory combines adding a random term to the Schrödinger equation with another concept from de Broglie and Bohm, relating quantum collapse to the universal gravitational field. This approach can be applied to both macroscopic objects like cats and atoms.
Quantum expander for gravitational-wave observatories
Researchers have developed a novel 'quantum expander' to improve signal-to-noise ratio at kilohertz frequencies in gravitational-wave observatories. This innovative approach squeezes quantum uncertainty of laser light inside optical resonators, expanding detection bandwidth.
Black holes sometimes behave like conventional quantum systems
Researchers at Skoltech found that black holes thermalize through the same mechanism as conventional quantum systems, providing insight into quantum gravity. The study confirms the Eigenstate Thermalization Hypothesis in spatially-extended systems, a long-sought proof.
Hello, world! A new approach for physics in de sitter space
A team at OIST Graduate University reports a new approach to quantum gravity using a model that more closely matches our reality, including accelerating expansion. The free S-matrix predicts interactions between particles in de Sitter space, which may help explain realistic scenarios.
A key piece to understanding how quantum gravity affects low-energy physics
A new study has provided a solid theoretical framework to discuss modifications to the Unruh effect caused by microstructure of space-time. The researchers found that thermal response for particle detectors can happen without a thermal state, contradicting an extended belief.
Researchers find quantum gravity has no symmetry
A new study by Hirosi Ooguri and Daniel Harlow finds that symmetry is not possible in quantum gravity when combined with the holographic principle. This breaks the long-held expectation of physicists and has several important consequences, including proton stability and magnetic monopole existence.
Listening to the quantum vacuum
Physicists have created a device that can detect and measure quantum radiation pressure noise, a significant source of uncertainty in gravitational wave detectors. The breakthrough aims to improve the sensitivity of next-generation detectors, potentially leading to more accurate detections.
Beyond Einstein
Physicists at LSU and Penn State develop new mathematical equations that go beyond Einstein's theory of general relativity, showing that black hole singularities do not exist. The theory predicts a funnel to another branch of space-time instead.