Tag

Arrow Of Time

All articles tagged with #arrow of time

discoveries1 month ago•47 min saved

Pairs of retinal neurons drive the brain's arrow of time

Researchers developed an information-theoretic framework to break a system's local arrow of time into contributions from individuals, pairs, triplets and higher-order groups. When applied to 53 salamander retinal neurons, pairwise interactions accounted for about 66–74% of local irreversibility, and the retina showed a stronger arrow of time under a time-reversible Brownian stimulus than under a natural movie, indicating internal neural processing can generate temporal asymmetry independent of the external input. The approach could be applied to other complex nonequilibrium systems to understand how irreversibility emerges from simple components.

via The Brighter Side of News|

#arrow-of-time #discoveries #irreversibility

science1 month ago•6 min saved

Time's Arrow Grounded in Quantum Decoherence, Al-Khalili Says

British physicist Jim Al-Khalili argues in On Time that the arrow of time is real and rooted in quantum decoherence and entanglement that occur when we observe systems, rather than being explained mainly by entropy; observation ties quantum systems to the environment and irreversibly fixes their state, while the many-worlds view remains a possibility. The piece also notes limits on time travel and points readers to related interviews and the Fiction Science podcast.

via Universe Today|

#arrow-of-time #decoherence #many-worlds

science2 months ago•59 min saved

Light's tempo in time-varying media hints at a microscopic 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.

via Yahoo|

#accelerating-wave-equation #arrow-of-time #light

discoveries2 months ago•39 min saved

Microscopic Arrow of Time Emerges From Accelerating Light Waves

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.

via The Brighter Side of News|

#accelerating-wave-equation #arrow-of-time #discoveries

science3 months ago•66 min saved

Time's Flow Reimagined: Gravity, Quantum Arrows, and the Shape of Reality

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.

via Yahoo|

#arrow-of-time #entropy #gravity

science4 months ago•3 min saved

Cosmic Collapse Hint: Time May Run Backwards Inside Neutron Stars

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.

via geekspin.co|

#arrow-of-time #cosmology #entropy

physics-and-chemistry6 months ago•17 min saved

Quantum Engine Reshapes Time’s Arrow with Feedback Control

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.

via Gizmodo|

#arrow-of-time #feedback-control #physics-and-chemistry

physics3 years ago•4 min saved

Unveiling the Time-Forward Nature of Accelerating Waves and Relativity

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.

via SciTechDaily|

#accelerating-waves #arrow-of-time #general-theory-of-relativity

physics3 years ago•2 min saved

Time's Unidirectional Flow Proven by Complex Light Solution

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.

via IFLScience|

#arrow-of-time #light #optics