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Four years after its closure, researchers working with data from the particle physics experiment BaBar have used the data to make the first direct measurement confirming that time does not run the same forwards as backwards – at least for the B mesons that the experiment produced during its heyday.
The application of quantum mechanics to fundamental particles rests on a symmetry known as CPT, for charge-parity-time, which states that fundamental processes remain unchanged when particles are replaced by their antimatter counterparts (C), left and right are reversed (P), and time runs in the reverse direction (T).
Theoretical physicists at the University of Valencia in Spain worked with researchers on BaBar to exploit the fact that the experiment had generated entangled quantum states of the meson Bzero and its antimatter counterpart Bzero-bar, which then evolved through several different decay chains. By comparing the rates of decay in chains in which one type of decay happened before another, with others in which the order was reversed, the researchers were able to compare processes that were effectively time reversed version of each other. They report in Physical Review Letters today that they see a violation of time reversal at an extremely high level of statistical significance.
“It was important to measure time reversal independently of charge-parity violation because there was always the possibility something was wrong with the full picture,” says Fabio Anulli of the National Institute for Nuclear Physics in Rome, who is physics coordinator for BaBar.
Originally posted by Blarneystoner
reply to post by ChaoticOrder
This study is a breakthrough in Physics.... Previously the arrow of time was not thought to be an intrinsic property of physics but rather, an emergent feature as a result of entropy.
Originally posted by Sublimecraft
I could use some clarity about what "time" is - the more I read, the more it seems we are in a holographic matrix - like sheep in a paddock.
Absolute, true and mathematical time, of itself, and from its own nature, flows equably without relation to anything external, and by another name is called duration: relative, apparent and common time, is some sensible and external (whether accurate of unequable) measure of duration by the means of motion, which is commonly used instead of true time; such as an hour, a day, a month, a year. (Isaac Newton, cited in Philosophy of Physics: Space and Time by Tim Maudlin, pg 13.)
Space and time are the framework within which the mind is constrained to construct its experience of reality. (Immanuel Kant)
Physicists led by Prof. Anton Zeilinger at the Institute for Quantum Optics and Quantum Information (IQOQI), the University of Vienna, and the Vienna Center for Quantum Science and Technology (VCQ) have, for the first time, demonstrated in an experiment that the decision whether two particles were in an entangled or in a separable quantum state can be made even after these particles have been measured and may no longer exist.