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Goodbye to gravity as we know it — Quantum wave makes spacetime tremble




For over a century, physicists have wrestled with a contradiction at the heart of modern science. While quantum mechanics governs the microscopic world with uncertainty and superposition, gravity has stubbornly remained a force described by classical physics. The dream of uniting these two frameworks often called quantum gravity has hovered as one of science’s ultimate goals. What’s at stake is more than theory. Without evidence that gravitational attraction behaves quantum, the disconnect limits how far we can push technology and hinders our understanding of the universe’s earliest moments.

Gravity’s impact on the universe

Black holes, the Big Bang, and even spacetime itself remain partly out of reach as long as gravity resists quantization. The pressure to close this gap is mounting, and researchers are chasing ways to probe the force that holds the cosmos together. Now, for the first time, physicists have designed an experiment that could expose gravity’s quantum side not by peering into deep space, but inside a laboratory at MIT.

Researchers from Aalto University have developed a new theoretical model that tries to describe gravity using quantum mechanics. Their approach aims to fit “the force” within the Standard Model of particle physics something scientists have been chasing for decades. If this framework holds up, it could help explain some of the biggest mysteries about how the universe began.
 
This new theory can change gravitational studies

Physicists have long worked toward building a unified theory that connects gravitation with the other fundamental forces: electromagnetism and the strong and weak nuclear forces. The difficulty lies in combining two frameworks that don’t naturally fit together quantum field theory, which describes particles and forces at very small scales, and Einstein’s theory of gravity, which explains how massive objects like planets and stars interact. Interestingly, even technologies like smartphone GPS depend on Einstein’s model of gravitation force to work correctly.

In the study, researchers Mikko Partanen and Jukka Tulkki explain how they used a type of mathematical structure called a gauge theory to approach gravitation. Gauge theories already describe the other fundamental forces, like electromagnetism, so applying similar ideas to it could be a step toward treating all four forces within one consistent framework. Instead of following the traditional spacetime-based approach of general relativity, their model uses symmetries similar to those found in the Standard Model.

This shift could help overcome one of the key challenges in modern physics: finding a way to describe both the smallest particles and the largest cosmic structures using a single theory. Current models work well in their own domains quantum physics for the tiny, and general relativity for the massive.
The difficulty in studying gravitational forces

One of the reasons gravitation is so hard to study at the quantum level is that it’s an incredibly weak force compared to the others. Measuring its effects in particle-scale experiments requires much higher precision than typical setups can handle. But in extreme environments, like near black holes or during the first moments after the Big Bang, the gravitational force and quantum effects both play key roles, and physicists need a theory that accounts for both at once.

According to the researchers, their method uses renormalization a mathematical tool that helps handle problematic infinities in calculations. So far, they’ve shown that the method works for some basic cases, but they’re still working to prove it can handle more complex scenarios consistently.

Tulkki explained that if their renormalization approach fails at higher levels of complexity, the calculations would produce infinite results something any physical theory must avoid. While a full proof is still in progress, the researchers are optimistic that their method will hold up.

#HighEnergyPhysics#ParticlePhysics#QuantumPhysics#AstroparticlePhysics#ColliderPhysics#HiggsBoson#LHC#QuantumFieldTheory#NeutrinoPhysics#PhysicsResearch#ComputationalScience#DataScience#ScientificComputing#NumericalMethods#HighPerformanceComputing#MachineLearningInScience#BigData#AlgorithmDevelopment#SimulationScience#ParallelComputing

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