This is one of the best explanations for Feynman’s Infinite Quantum Paths thanks to PBS Space Time
Sorry it’s been quiet here for a while. Exam season slows us down a little.
Original article via Science Alert
It’s official: time crystals are a new state of matter, and now we can create them – ScienceAlert:
Earlier this year, physicists had put together a blueprint for how to make and measure time crystals – a bizarre state of matter with an atomic structure that repeats not just in space, but in time, allowing them to maintain constant oscillation without energy.
Two separate research teams managed to create what looked an awful lot like time crystals back in January, and now both experiments have successfully passed peer-review for the first time, putting the ‘impossible’ phenomenon squarely in the realm of reality. More…
Image: Pete LinForth/Pixabay
Original article on Phys.org
Normal crystals, likes diamond, are an atomic lattice that repeats in space, but physicists recently suggested making materials that repeat in time. Last year, UC Berkeley’s Norman Yao sketched out the phases surrounding a time crystal and what to measure in order to confirm that this new material is actually a stable phase of matter. This stimulated two teams to build a time crystal, the first examples of a non-equilibrium form of matter.
To most people, crystals mean diamond bling, semiprecious gems or perhaps the jagged amethyst or quartz crystals beloved by collectors.
To Norman Yao, these inert crystals are the tip of the iceberg.
If crystals have an atomic structure that repeats in space, like the carbon lattice of a diamond, why can’t crystals also have a structure that repeats in time? That is, a time crystal?
In a paper published online last week in the journal Physical Review Letters, the University of California, Berkeley assistant professor of physics describes exactly how to make and measure the properties of such a crystal, and even predicts what the various phases surrounding the time crystal should be—akin to the liquid and gas phases of ice.
Read more at: https://phys.org/news/2017-01-physicists-unveil-mattertime-crystals.html#jCp
Via Physics Today
Theories that incorporate hidden variables are consistent with quantum mechanics only if the systems they describe can store unlimited information.
John Stewart Bell’s famous theorem is a statement about the nature of any theory whose predictions are compatible with those of quantum mechanics: If the theory is governed by hidden variables, unknown parameters that determine the results of measurements, it must also admit action at a distance. Now an international collaboration led by Adán Cabello has invoked a fundamental thermodynamics result, the Landauer erasure principle, to show that systems in hidden-variable theories must have an infinite memory to be compatible with quantum mechanics.
The latest PBS Digital video discusses quantum realism via the Pilot Wave Theory. A theory yet to be given the credibility of the Copenhagen interpretation because it doesn’t allow for relativity.
We’ve been discussing here recently how relativity can possibly be independent of time if time itself is quantum. I’ve spoken about this before in relation to dark energy and will probably write an update soon.
PBS Space Time explain why the expansion of the universe is still accelerating
This is wonderful!
Physics Girl nails the birth of Quantum Mechanics from mistakes made by physicists attempting to solve other problems.
Our sun is not immortal, it’s going to die soon. Well, in about 5 billion years, but on a cosmic scale, that’s not long. Fraser Cain investigates how we can save our sun and how a type 3 generation could dismantle stars to make full use of fusion.
Don’t have nightmares!
PBS Digital’s “Space Time” series is rapidly becoming our favourite YouTube Channel. Check out their excellent explanation of the Fifth-Force Observation and the answer to a quantum puzzle that we knew the answer but couldn’t explain half as well!
PBS Digital’s Space Time continues to delve into the weird and wonderful world of Quantum Mechanics with the experiment that broke reality!