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"Entangled toy universe shows time may be an illusion"

26.10.13

 

 The team started by sending a pair of entangled photons along two separate paths. The photons start out polarised, or orientated, either horizontally or vertically, and the polarisation rotates as both photons pass though a quartz plate and on to a series of detectors.

The entangled photons exist in a superposition of both horizontal and vertical states simultaneously until they are observed. But the thicker the plate, the longer it takes the photons to pass through and the more their polarisation evolves, affecting the probability that either one will take a particular value.

In one mode of the experiment, one of the photons is treated like a clock with a tick that can alternate between horizontal and vertical polarisation. Because of entanglement, reading this clock will affect the polarisation value of the second photon. That means an observer that reads the clock influences the photons' universe and becomes part of it. The observer is then able to gauge the polarisation value of the other photon based on quantum probabilities.

Since photons passing through a thicker quartz plate experience a different degree of change, repeating the experiment with plates of different thicknesses confirms that the second photon's polarisation varies with time.

In another mode, the experimenter is a "super-observer" that exists outside of the universe, and so measures the quantum state of the system as a whole. From that vantage point, the state of both photons taken together is always the same, giving the appearance of a static universe.

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Douglas Hofstatdter

25.10.13

 

“Beware,” he writes, “of innocent phrases like ‘Oh, yeah, that’s exactly what happened to me!’ … behind whose nonchalance is hidden the entire mystery of the human mind.”

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"drink till the moon becomes the sun, and in the taxi home i'll sing you a triffids song!"

25.10.13

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Winter is late in coming

25.10.13

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"Setting fire to our insides for fun"

23.10.13

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PSA

23.10.13

[New policy] If you meet Buddha on the road, smile and wave. Please spread this message.

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Don't opress me!

23.10.13

I was born a male, but I identify as a post-supernova neutron star. No doctor is willing to give me an operation.

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Time's Arrow

23.10.13

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"Control of the socio-economic systems using herding interactions"

21.10.13

 

 Collective behavior of the complex socio-economic systems is heavily influenced by the herding, group, behavior of individuals. The importance of the herding behavior may enable the control of the collective behavior of the individuals. In this contribution we consider a simple agent-based herding model modified to include agents with controlled state. We show that in certain case even the smallest fixed number of the controlled agents might be enough to control the behavior of a very large system.

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Katie Knoll - "Skinned"

21.10.13

My uncle is skinning peaches for cobbler because I stink
like city, he says, like iron and exhaust and a girl should know
the taste of something with the sun still inside it, because when I leave
this house and go back to my mama and she breathes me in


he wants me to smell like she used to, like dirt. The peach is spurting
juice down his wrists and onto the counter. He fingers the veins in the pit,
says eat one, you’ll grow a tree inside you, your mama had one once
but she tore it up, killed it good, took you south. He says your mama


thinks she can crawl out of this ground and slit
her roots, pretend like she don’t know what sun
gave her the freckles on her skin. He says you can skin
a goddamn peach and still wanna eat it


but you can’t skin a person and keep it breathing,
and he grabs my face so the peach juice courses from his hands
down my throat and he says you cannot know a thing about the ground ’til
you’re six feet in it, but you will always have this dirt in your blood.

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