Category Archives: Physics

Ptolemy’s Revenge

2154 years after being written, and 464 years after being rendered obsolete by Copernicus, the Ptolemaic System is coming back with a vengeance, masquerading as Garrett Lisi’s Theory of Everything

Crowds, Echoes and Communication with Parallel Universes

The existence of a Multiverse has many philosophical consequences (and it just makes so much more physical sense than having us living in a Goldilocks Universe). And as the Multiverse has been postulated from actual observations, we can almost say we can test its existence.

Of course it would be all much more interesting if we could talk to a parallel universe.

Or would it? Communication between Universes may actually be made rather difficult by a “crowding echo effect“.

Imagine I were to try send a message via a quantum interference pattern, for example.

Obviously, all my quasi-identical copies from “nearby” parallel universes quasi-identical to my own Universe, would be trying to send quasi-identical information via quasi-identical ways at quasi-identical times: so we could all be creating so much noise as to make the reception of any message next-to-impossible.

Even more paradoxically, we could actually be reading each other’s message: but since those messages would all be quasi-identical to each other, we could mistakenly convince ourselves that we were listening each one only to his own echo.

After all what meaningful information could anybody exchange with a quasi-identical copy?

It may take a very very long time to figure out the minute differences between the two and those may as well be undetectable or absolutely irrelevant.

Grey-sky Hubris on The Economist

If the effect of clouds on climate is “obscure” and “little is currently known about where [aerosols] end up in the atmosphere” (as recognised on The Economist’s “Grey-sky thinking”, July 5, 2007), what kind of hubris is necessary to state, as at the beginning of the article, that “the general trends [of climate] are clear”?

Late-XIX-century physics looked pretty much complete too, apart from the obscure problem of black-body radiation, solved by Planck in 1900 by discovering the hitherto completely unknown world of quantum physics.

Beam Me Cold, Scotty

Fact: we already know how to teleport single ions of calcium and beryllium.

Fact: such “teleportation” means the transfer of quantum states between ion A and ion B, so that at the end of the transfer B becomes for all intents and purposes identical to what A was at the beginning of the transfer.

Fact: we already know how to make groups of atoms behave as one quantum entity, by cooling them very near absolute zero until they become a Bose-Einstein condensate (BEC).

Vision: all we need to make Star-Trek-like teleportation a reality then, it’s finding a way to cool a person into a BEC, transfer its quantum state into just the right BEC far away, and then heat this back as the teleported copy of the original person.

In the meanwhile, let’s wait for a few confirmatory experiments…

The Physics of Miracles And Of Free-Will

A scientific finding published a few months ago on Physical Review Letters and reported on The Economist may soon send religious types of all sorts and shapes to salivate back to their Physics books.

5% of a proton’s magnetism is contributed not by the host quarks but by visiting strange quarks that have popped out of nowhere“.

It is a perfectly reasonable discovery. Current quantum physics in fact

predicts that so-called virtual quarks, together with their anti-matter partners, are continuously emerging from the vacuum of space and then disappearing again as a result of Heisenberg’s uncertainty principle. So, while a proton has three resident quarks, it also plays host to a lot of short-term visitors

Nevertheless, such a discovery may herald fascinating consequences.

First of all, 5% is not exactly a negligible quantity.

Second, the measurement is obviously an average, so one proton will get a little nudge in one direction, another proton a slightly larger or smaller nudge in another direction, and so on and so forth. There is no macroscopic effect…but only insofar as the virtual particles pop up randomly in the protons.

Third, if this happens for one kind of particle, it is extremely likely it will happen for all kinds of particles, not just protons

Fourth, if this happens for one kind of force, it is highly likely it will happen for all kinds of forces, not just magnetism

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The end result is that when we will be able to control where, when and how virtual particles pop-up within real particles, we will be capable to do all sort of currently deemend impossible actions. Imagine being able to “focus” the properties of a magnet so that it will attract a particular metallic object, instead of all the objects within a certain distance range….suddenly, one could move specific objects from a distance. That’s telekinesis for you.

Or look forward to the time gravitational fields will be strengthened, weakened, focused at will. That’s levitation for you. And spaceflight and levitating cars will become a child’s play to build and pilot.

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Those are just dreams at the moment, impossibilities, what we could call Miracles if we were to witness them (as per A.C. Clarke’s famous saying: Any sufficiently advanced technology is indistinguishable from magic).In fact, what is there to prevent God from using those same virtual quarks exactly to perform…Miracles? (God of course could be prevented by being non-existant 8-) ; but let’s assume for now that’s not the case…).

Levitation does indeed allow one to walk on water or fly from Mecca to Jerusalem, or telekinesis the parting of the Red Sea. Some good control of the strong force and quark mechanics simplifies transforming water into wine or anything else.

Etc etc. So virtual particles popping all over the place may be God’s Backroom Control: invisible and intangible but still very much of consequence. Sort of a Miracle Physics (MP) Model.

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For the Theist, it all makes sense.The Deity would have created a Universe that can take of itself but still not completely impervious to on-the-fly modificationsAlso the main objection against miracles would lose ground, as in the MP model the Divinity can intervene without foregoing the natural laws inscribed in the Universe

Just as light is a wave AND a particle, and an electron is a wave and a particle, we could say that the Universe is at the same time deterministic AND random. Not to mention that Evolution can then be a random walk AND the guided unveiling of some underlying plan.

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So do we (well, IF we exist) have free will or are we in the hands of an omnipotent figure (if He/She exists) that decides things for us? Both.