Anders Sandberg

@anderssandberg

Academic jack-of-all-trades.

Vrijeme pridruživanja: rujan 2009.

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  1. proslijedio/la je Tweet
    prije 5 sati

    In a slight change to the programme, tomorrow's talk will now be given by Dr Anders Sandberg : Why it is 'easy' to colonise the Universe. Thanks for stepping in ! 🙌Tue 4 Feb, 1pm, Pearson LT

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  3. Since all algebraic curves can be drawn by linkages, there are linkages that draw the k-iteration escape curves |f(z)^k|=2 of the Mandelbrot set, approximating the fractal as k increases. I assume they could be expressed recursively in terms of a basic z^2+z linkage?

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  4. proslijedio/la je Tweet
    2. velj

    NASA concept art by Rick Guidice, 1976. I've looked at this piece about a gazillion times but only recently did I notice the *other* space colonies floating in the distance.

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  5. 1. velj

    When I meet people who are claiming to expect imminent doom I try to resist the urge to ask: "So, can I have your stuff? I want to use it for my long-term projects."

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  6. 31. sij

    Here is a cute idea: MRI tends to be noisy and many patients get nervous from the weird sounds. So manipulate the field gradients to play music. Turn the superconductor into a cello!

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  7. 31. sij

    The fact that I do regard states as essentially telcos rather than sacred homelands clearly shows what side I am on.

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  8. 31. sij

    When considering my feelings about Brexit I realize they are a bit like when my old Swedish telco sold their UK subsidiary to a UK telco a few years back - an annoying reduction in my service there was not much to do about. (Except eventually switching provider again)

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  9. 31. sij

    What is really going on in actual physics remains to be seen. Not all random graphs produce the right result, and how they are generated matters. One could have continuous physics with finite accessible information (e.g. because of microscale noise).

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  10. 31. sij

    Even more fun, if one uses quantum mechanics on a regular lattice it is possible to get distances that behave like they are continuous when they are measured, getting around Weyl's problem. This is the land of loop quantum gravity.

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  11. 31. sij

    If one uses a disordered graph one does get lines, velocities and circles that look like they should once the scale is big enough:

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  12. 31. sij

    Some use this to argue we are not in a computer simulation since space does look isotropic and Lorenz-invariant. They are wrong since simulations do not have to run on regular grids (whether reality is simulated is another matter).

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  13. 31. sij

    Weyl pointed out that if you have a lattice with a shortest length the Pythagorean theorem does not work. Spheres will not be spheres but cubes, shortest paths follow taxi-cab geometry, space is not isotropic. This generalizes to any regular graph:

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  14. 31. sij

    Many dislike the idea that stuff could be truly continuous (you need infinite information to specify a point) and suggest some discrete structure like a lattice or a graph. Others think continuous symmetry is so important (conservation laws) it implies continuous spacetime.

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  15. 31. sij

    Friday (theoretical) physics fun: is spacetime discrete or not? Normally we assume space is infinitely divisible just like the real numbers: between two points there will always be at least one more point. It is not obvious this has to be true. Matter turned out to be atoms.

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  16. proslijedio/la je Tweet
    31. sij

    "We found no support for any detrimental effects of cognitive ability and no evidence for a threshold beyond which greater scores cease to be beneficial. Thus, greater cognitive ability is generally advantageous—and virtually never detrimental."

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  17. 30. sij

    Whew. At least one potential problem out of the way for now.

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  18. 29. sij

    The main limiting factor of this kind of academic legends is likely the exponential fall-off of citation over time and generational shifts: the final nail for disproven claims is not the disproof but when accidental references cease.

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  19. 29. sij

    The reason is to spread awareness that this is an academic urban legend (making others less likely to do the mistake). If we just leave out correcting common misconceptions they will remain tenaciously common. With correction, they will show up too, but at a lower rate.

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  20. 29. sij

    Another anti-leprechaun strategy: whenever you uncover one, even if you do not use it directly in your paper, make sure there is some mention that it is a leprechaun: "[1]: Drapetomania is another common example in this category, but turns out to be largely fictional..."

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