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Physicists have demonstrated with unprecedented accuracy that the speed of light remains constant. In 1887, a landmark physics experiment was carried out by American researchers Michelson and Morley. They attempted to detect Earth’s motion through space by comparing the speed of light along Earth’s ...

A subtle timing flash may expose the Unruh effect. The approach ties ordinary lab tools to deep quantum physics. Researchers at Stockholm University and the Indian Institute of Science Education and Research (IISER) Mohali have identified a practical method for detecting one of physics’ most unusual...

Researchers at TU Wien have developed a one-dimensional “quantum wire” using a gas of ultracold atoms. In this system, both mass and energy can move freely without friction or energy loss. In everyday physics, transport refers to the movement of something from one place to another. This can include ...

At the smallest scales, heat engines can do more than Carnot ever imagined. Researchers at the University of Stuttgart have shown that the Carnot principle, a foundational rule of thermodynamics, does not hold for atomic-scale systems whose physical properties are interconnected (so-called correlate...

Electrons are usually described as particles, but in a rare quantum material, that picture completely breaks down. Quantum physics shows that particles do not behave like solid objects with fixed positions. Instead, they also act like waves, which means their exact location in space cannot be pinned...

Hamilton’s 19th-century insight connecting light and motion became a cornerstone of quantum mechanics and modern physics. William Rowan Hamilton, the Irish mathematician and physicist born 220 years ago last month, is often remembered for an unusual act in 1843, when he carved a mathematical formula...

A newly observed acoustic time crystal uses sound waves to levitate particles that oscillate through nonreciprocal interactions. The discovery challenges classical physics and hints at applications in technology and biology. Time crystals are systems made up of particles that repeat a steady back-an...

A subtle twist between atomically thin magnetic layers can generate unexpectedly large and complex spin structures. A tiny twist between two ultrathin crystals can act like a new control dial for matter. In the past few years, physicists have learned that rotating stacked two-dimensional layers by j...

A physicist proposes that consciousness is the fundamental basis of reality, with matter and spacetime emerging from it. What if consciousness is not produced by the brain, but instead forms the foundation of reality itself? That is the premise of a new theoretical model introduced by Maria Strømme,...