All articles tagged with #arrow of time
A new accelerating wave equation describes waves whose speed changes over time, yielding a wave-frame “proper time” and a potential microscopic arrow of time. It frames momentum as conserved in the wave’s own reference frame and suggests time-varying photonic materials could test the idea, though practical experiments face energy losses, material damage, and other challenges.
Researchers propose an accelerating wave equation that describes waves whose speed changes with time, introducing a wave’s intrinsic time and revealing relativistic-like effects; the framework suggests a microscopic arrow of time within wave mechanics and offers a new lens on momentum in dielectrics, potentially testable in time-varying photonic systems, though practical challenges like energy losses and material damage remain.
New theoretical ideas suggest time may emerge from gravity via Shape Dynamics, while open quantum systems could host two arrows of time; other approaches explore time as potentially emergent or even illusory, with concepts like tachyons and quantum entanglement hinting at multi-dimensional or timeless frameworks.
Physicists modeling collapsing neutron stars find that, under extreme gravity, entropy could decrease in their equations, effectively implying time might run backward in that context—a mathematical insight into the arrow of time rather than a real, observable reversal.
Physicists reveal a measurement-based feedback protocol that can steer a monitored quantum system’s evolution to mimic reversed time, effectively reshaping the arrow of time and enabling potential energy extraction in quantum devices; while not time travel, the approach could boost quantum batteries and algorithms, with plans to test on superconducting qubits.
Researchers at Tampere University and the University of Eastern Finland have derived a new wave equation that connects wave mechanics with the general theory of relativity and the arrow of time. This breakthrough offers solutions to long-standing physics debates and introduces applications for novel materials. The researchers discovered that the accelerating wave equation only allows solutions where time flows forward, establishing a well-defined direction of time. Additionally, the framework can be used to model continuous waves across interfaces, resolving the Abraham-Minkowski controversy regarding the conservation of momentum in light. The research has implications for everyday optical effects, laboratory tests of relativity, and the understanding of time's preferred direction.
Scientists have discovered a new equation that explains the behavior of light passing through an interface, such as glass or water. The equation, derived in a universe with one space dimension and one time dimension, shows that the speed of light is not always constant and that time can only move forward. This suggests that the arrow of time, which is important in physics, might be an intrinsic property of nature that even light obeys. The equation also resolves the long-standing controversy regarding the momentum of light when it enters a medium, providing a solution that conserves momentum through relativistic effects.