All you feel
All you save
All that you buy, beg, borrow or steal
All that you say
Everyone you fight
And everything under the sun is in tune
But the sun is eclipsed by the moon.
Matter of fact it’s all dark.
Hard for some people to wrap their minds around really (wait until we get to the quantum time machine simulator), but it is a fact that the Dark Side of the Moon gets exactly as much sunlight as the side facing Earth.
What prompts this musing is the new video from NASA showing the Dark Side-
Now no doubt you are familiar by this time with the ‘Big Squash’ theory of Lunar formation which contends that the Moon is the result of an oblique collision between the proto-Earth and a Mars sized planet. Recent simulations suggest that two bodies formed out of that and their eventual consolidation is responsible for the difference in composition and appearance between the far and near side.
In other related news the next ‘Super Moon‘ (where the Moon is at its closest to Earth) will be Febuary 18th and be a ‘Black’ Moon, a New Moon (meaning all the light is hitting the far side) and the 3rd of 4 New Moons this winter.
Timey Whimey Stuff
On a quantum level there is no particular bias for time to proceed from cause to effect which makes some theoretical physicists (Stephen Hawkings) angry since it goes so much against our perceptions of reality on a macro scale and introduces paradoxes. Scientists at the University of Queensland have recently simulated a quantum time machine and found that traveling backwards in time is indeed theoretically possible.
Much of their simulation revolved around investigating how Deutsch’s model deals with the “grandfather paradox,” a hypothetical scenario in which someone uses a CTC to travel back through time to murder her own grandfather, thus preventing her own later birth.
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Deutsch’s quantum solution to the grandfather paradox works something like this:Instead of a human being traversing a CTC to kill her ancestor, imagine that a fundamental particle goes back in time to flip a switch on the particle-generating machine that created it. If the particle flips the switch, the machine emits a particle-the particle-back into the CTC; if the switch isn’t flipped, the machine emits nothing. In this scenario there is no a priori deterministic certainty to the particle’s emission, only a distribution of probabilities. Deutsch’s insight was to postulate self-consistency in the quantum realm, to insist that any particle entering one end of a CTC must emerge at the other end with identical properties. Therefore, a particle emitted by the machine with a probability of one half would enter the CTC and come out the other end to flip the switch with a probability of one half, imbuing itself at birth with a probability of one half of going back to flip the switch. If the particle were a person, she would be born with a one-half probability of killing her grandfather, giving her grandfather a one-half probability of escaping death at her hands-good enough in probabilistic terms to close the causative loop and escape the paradox. Strange though it may be, this solution is in keeping with the known laws of quantum mechanics.
In their new simulation Ralph, Ringbauer and their colleagues studied Deutsch’s model using interactions between pairs of polarized photons within a quantum system that they argue is mathematically equivalent to a single photon traversing a CTC. “We encode their polarization so that the second one acts as kind of a past incarnation of the first,” Ringbauer says. So instead of sending a person through a time loop, they created a stunt double of the person and ran him through a time-loop simulator to see if the doppelganger emerging from a CTC exactly resembled the original person as he was in that moment in the past.
By measuring the polarization states of the second photon after its interaction with the first, across multiple trials the team successfully demonstrated Deutsch’s self-consistency in action. “The state we got at our output, the second photon at the simulated exit of the CTC, was the same as that of our input, the first encoded photon at the CTC entrance,” Ralph says. “Of course, we’re not really sending anything back in time but [the simulation] allows us to study weird evolutions normally not allowed in quantum mechanics.”
In essence the paradox is resolved by changing the future to fit the facts of the past. Once the cat is dead (or alive) the only way forward is the probabilities based on the dead (or live) cat. No return to a state of quantum uncertainty (in that respect) is possible so if you did indeed succeed in killing your grandfather the only future you could return to is one in which your grandfather is dead.
Nor would you disappear. Your past self represents the resolution of quantum states that can no longer have any values other than the ones that have been measured.
Tricky eh?
The law that entropy always increases holds, I think, the supreme position among the laws of Nature. If someone points out to you that your pet theory of the universe is in disagreement with Maxwell’s equations – then so much the worse for Maxwell’s equations. If it is found to be contradicted by observation – well, these experimentalists do bungle things sometimes. But if your theory is found to be against the second law of thermodynamics I can give you no hope; there is nothing for it but to collapse in deepest humiliation.
–Sir Arthur Stanley Eddington, The Nature of the Physical World (1927)
Science News and Blogs
- Watch physicist Brian Cox excitedly explain Higgs boson and the ‘unreasonable effectiveness of math’, by Eric W. Dolan, Raw Story
- Will Neil deGrasse Tyson’s mix of science and pop culture be enough to fill the Jon Stewart void?, Newsweek
- Google Threatens to Air Microsoft and Apple’s Dirty Code, by Chris Strohm and Jordan Robertson, Bloomberg News
- DNA Reveals How Darwin’s Finches Evolved, by Warren Cornwall, National Geographic
- Were dinosaurs tripping on the grass they ate?, by Michael Franco, CNet
- Scientists Weigh in on Plans to Hack the Weather and Cool the Earth, by Sarah Zhang, Gizmodo
- Scientists Have Figured Out a Way to Convert Solar Energy Into Liquid Fuel, by Sabrina Toppa, Time
- Comets Form Like Deep Fried Ice Cream Scoops, by Ian O’Neill, Discovery News
- Scientists now know how popcorn pops, AFP
- Sweet Science: Study Discovers How Many Licks It Takes to Reach the Center of a Tootsie Pop, By Kelli Bender, People
Three.
Science Oriented Video
Obligatories, News and Blogs below.