The Fabric of Cosmos and other things

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This topic contains 248 replies, has 6 voices, and was last updated by  Mari 3 years, 8 months ago.

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  • #687

    judith
    Member

    duality continues —

    Wave-Particle Duality: Light

    Does light consist of particles or waves? When one focuses upon the different types of phenomena observed with light, a strong case can be built for a wave picture:

    Interference

    Diffraction

    Polarization
    By the turn of the 20th century, most physicists were convinced by phenomena lke the above that light could be fully described by a wave, with no necessity for invoking a particle nature. But the story was not over.

    Phenomenon Can be explained in terms of waves. Can be explained in terms of particles.
    Reflection
    Refraction
    Interference
    Diffraction
    Polarization
    Photoelectric effect
    Most commonly observed phenomena with light can be explained by waves. But the photoelectric effect suggested a particle nature for light. Then electrons too were found to exhibit dual natures.

    http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html

    #694

    annie
    Participant

    Robert P. Crease, a member of the philosophy department at the State University of New York at Stony Brook and the historian at Brookhaven National Laboratory, recently asked physicists to nominate the most beautiful experiment of all time…
    Guess which one took first place 🙂

    1. Double-slit electron diffraction

    The French physicist Louis de Broglie proposed in 1924 that electrons and other discrete bits of matter, which until then had been conceived only as material particles, also have wave properties such as wavelength and frequency. Later (1927) the wave nature of electrons was experimentally established by C.J. Davisson and L.H. Germer in New York and by G.P. Thomson in Aberdeen, Scot.

    To explain the idea, to others and themselves, physicists often used a thought experiment, in which Young’s double-slit demonstration is repeated with a beam of electrons instead of light. Obeying the laws of quantum mechanics, the stream of particles would split in two, and the smaller streams would interfere with each other, leaving the same kind of light- and dark-striped pattern as was cast by light. Particles would act like waves. According to an accompanying article in Physics World, by the magazine’s editor, Peter Rodgers, it wasn’t until 1961 that someone (Claus Jönsson of Tübingen) carried out the experiment in the real world.

    #695

    annie
    Participant

    Oh, and in case anyone is interested, here is the link to the other nine…
    http://physics-animations.com/Physics/English/top10.htm

    #753

    ulvfugl
    Keymaster

    Thanks for those, annie. Very cool ! Eratosthenes was the man !

    What does my brain in, is the statement that the photon doesn’t actually move at all…. whilst travelling at the speed of light… and being both a wave and a particle… I may have got it completely wrong… but that does appear to be the case… afaik….

    #997

    Mari
    Participant
    #999

    ulvfugl
    Keymaster

    Hi Mari,
    Milky Way and Andromeda Galaxy set to collide. It looks very pretty, from 4 billion years away….

    http://phys.org/news/2012-05-hubble-milky-destined-head-on-collision.html

    #1000

    ulvfugl
    Keymaster
    #1060

    ulvfugl
    Keymaster

    #1064

    ulvfugl
    Keymaster

    Nature is always so much more astonishing than we ever imagine…

    Asynergistic reaction pathway has been identified between semiconducting minerals and bacteria. Such reactions sustain electron and energy flow from light to nonphototrophic bacteria via semiconducting minerals, which act as a catalytic shuttle. Understanding this pathway may shed light on a unique ecosystem that potentially carries out phototrophic metabolism without the involvement of phototrophic organisms. Four key natural elements of this system are sunlight, semiconducting minerals, nonphototrophic bacteria, and water. This pathway also suggests a “self-cleansing” mechanism that may exist in nature, whereby both oxidative and reductive degradation of contaminants can occur.

    http://171.66.125.216/content/8/2/125

    #1096

    Mari
    Participant

    #1097

    Mari
    Participant

    #1098

    Mari
    Participant

    Fretkillr and St. Anne

    #1099

    Mari
    Participant

    St. Anne on fiddle in the meadow

    #1101

    ulvfugl
    Keymaster

    I believe that before it moved south to the Appalachians, it was a Newfoundland tune, and before that, Scottish.

    #1175

    Mari
    Participant

    Cosmic travel – all the way out, and all the way in. Nothing is more mysterious, more beautiful, more moving. The sad part of being an atheist, is that there is nobody to say thank you to…

    #1176

    ulvfugl
    Keymaster

    “The sad part of being an atheist, is that there is nobody to say thank you to…”

    Eh ?

    You could say thank you to the thing that permits you to know…..

    “First a person thinks that he is an inferior and that there is a superior, all-knowing, all powerful God who controls his own and the world’s destiny and worships him or does Bhakti. When he reaches a certain stage and becomes fit for enlightenment, the same God whom he was worshipping comes as Guru and leads him on. That Guru comes only to tell him that ‘God is within yourself. Dive within and realize.’ God, Guru and the Self are the same.”

    http://www.sriramanamaharshi.org/teachings.html

    http://the-wanderling.com/nirvakalpa.html

    #1177

    ulvfugl
    Keymaster

    #1212

    Mari
    Participant

    Well, God in me or not, the universe is still not my making. But maybe the feeling of gratitude is just meaningless on such a scale. As Alan Watts said: “we are the universe”.

    #1221

    ulvfugl
    Keymaster

    “Well, God in me or not, the universe is still not my making. But maybe the feeling of gratitude is just meaningless on such a scale. As Alan Watts said: “we are the universe”.”

    Hi Mari….

    In a sense, God and/or the Universe are your making, because they are mental constructs, conceptions in your mind.

    There’s a distinction to be made between the signifier and the signified, the map and the territory, the idea and the reality to which that idea corresponds.

    You have ideas about being an atheist, about God, about the Universe. My point would be that those ideas are not helpful or useful, if a person wants an experience of God. Such an experience is not an idea. Such an experience is more like a level of consciouness beyond, or above, all ideas. Such a level of consciousness has been achieved and cultivated by individuals for thousands of years. From the perspective of that level of consciousness, the whole matter of existence, of being, looks different.

    #1227

    ulvfugl
    Keymaster

    To expand on that…

    Look, everyone, every little kid, has a concept in their mind of what a horse is, and can probably draw a stick-figure version. But it’ll be obvious that the mental concept is nothing like the raw reality of the animal, which is something entirely different, if you own one, learn to ride, or even just walk up to one in a field.

    That process, of deepening and broadening one’s insight into the nature of a concept is the hermeneutic cycle that I mentioned here.

    There’s probably no final point where a person can claim complete insight and comprehension of anything, certainly not with something as subtle and varied and complex as a horse, even after a lifetime of study.

    This same dynamic, or analysis, applies to the concept God. You may start with a very crude idea, inflicted by soceity and culture and institutionalised religion, a concept which has been comprehensively corrupted and distorted over many centuries, by unethical people who have used it as a means of power and manipulation. So a process of un-learning is required, to discard the false idea, before one can pursue the actual reality.

    Same goes for horses. They do not necessarily bear any resemblance to a naive cuddly friendly pet of the imagination. They can kick, buck, bite, refuse to cooperate in any way whatsoever. Just as with God, there’s a long, long history of the relationship with people, and it has changed from time to time, and according to cultural understanding.

    #1228

    ulvfugl
    Keymaster

    #1229

    ulvfugl
    Keymaster

    #1230

    Mari
    Participant

    In a way it’s difficult to talk about God at all, because it’s more of a homonym, as the word “bow”. Look here at wiki’s page on the conceptions of God: wiki God. From “a powerful, human-like, supernatural being” to “being” itself. I wish there were more nuanced words for God. The way you talk about God, it sounds like “expanded consciousness”, which has little to do with Gandalf in the sky.

    #1231

    Mari
    Participant

    #1232

    ulvfugl
    Keymaster

    In a way it’s difficult to talk about God at all, because it’s more of a homonym, as the word “bow”. Look here at wiki’s page on the conceptions of God: wiki God. From “a powerful, human-like, supernatural being” to “being” itself. I wish there were more nuanced words for God. The way you talk about God, it sounds like “expanded consciousness”, which has little to do with Gandalf in the sky.

    Well, that was what I was trying to convey to you. You said you’re an atheist, presumably because you reject the idea of ‘God’.
    And I’m saying that the ‘idea’ of God is something that changes, or can change, because it’s a mental concept, like ‘horse’ or ‘cabbage’ or ‘cuttlefish’ or ‘dark matter’ or any other mental construct.

    So, I, and many others throughout history, go on a quest to seek the reality, or not, of whatever it is that the word was intended to signify.

    I don’t think ‘God’ is an exact synonym for ‘expanded consciousness’, however, to apprehend or approach God, requires a different level of consciousness to that which most people are on most of the time. So, it takes some training.
    The buddhists and hindus and others have sophisticated conceptual maps for that training, e.g. turiya which I found very helpful. That’s in marked contrast to the standard Catholic and Protestant approaches, which IMO are totally corrupt, in that they insist there’s no way to find God except via Grace, which leaves one helpless, which is what they want, i.e. totally dependent upon their priesthood and power hierarchy.

    But some people have understood all this long ago, e.g. the anonymous author of The Cloud of Unknowing.
    Whoever he or she was, they weren’t fooled by some bearded sky-daddy figure. It’s a wonderful book, especially if you read between the lines, strip out the traces of dogma, and appreciate that that kind of approach could get you burned alive at the time. I think the intro is fabulous :

    ” Fleshly janglers, open praisers and blamers of themselves or of any other, tellers of trifles, ronners and tattlers of tales, and all manner of pinchers, cared I never that they saw this book.
    For mine intent was never to write such thing unto them, and therefore I would that they meddle not therewith; neither they, nor any of these curious, lettered, or unlearned men.
    Yea, although that they be full good men of active living, yet this matter accordeth nothing to them.”

    There’s another interesting thing to consider, that’s heretical to the monotheistic Abrahamic religions, and that is the neo-platonist and gnostic idea of Pleroma. Which is roughly analogous to the notion that white light is composed of coloured lights. That is, there is one source, one God, like the white light, but then that one breaks up into many separate gods and goddesses, as perceived by humans, i.e. the coloured light frequencies. It’s still all the same thing.
    What I find fascinating, not only did that idea come up in the ancient Mediterranean area, but it’s also held by the Japanese Shinto nature religion. It’s a shame it isn’t more widely accepted, and then we could get away from the insane intolerance exhibited by some Christians, Jews and Moslems, that they, and only they, are correct in their view, and everyone else has to be killed or converted.

    #1233

    ulvfugl
    Keymaster

    #1237

    Mari
    Participant

    – So, I, and many others throughout history, go on a quest to seek the reality, or not, of whatever it is that the word was intended to signify.

    But here is something puzzling to me: In the effort to experience “reality”, people reject the myths about it, dig into science, decide science isn’t deep enough, and then manipulate their brains by flooding it with chemicals in the form of LSD or similar, to try to get to this more advanced reality. As a way of trying wring more insight out of the grey mass. But that seems to also be an illusion:

    A new study by British researchers supports this theory. It shows for the first time how psilocybin — the drug contained in magic mushrooms — affects the connectivity of the brain. Researchers found that the psychedelic chemical, which is known to trigger feelings of oneness with the universe and a trippy hyperconsciousness, does not work by ramping up the brain’s activity as they’d expected. Instead, it reduces it.

    Under the influence of mushrooms, overall brain activity drops, particularly in certain regions that are densely connected to sensory areas of the brain. When functioning normally, these connective “hubs” appear to help constrain the way we see, hear and experience the world, grounding us in reality. They are also the key nodes of a brain network linked to self-consciousness and depression. Psilocybin cuts activity in these nodes and severs their connection to other brain areas, allowing the senses to run free.

    #1239

    ulvfugl
    Keymaster

    “But here is something puzzling to me: In the effort to experience “reality”, people reject the myths about it, dig into science, decide science isn’t deep enough, and then manipulate their brains by flooding it with chemicals in the form of LSD or similar, to try to get to this more advanced reality. As a way of trying wring more insight out of the grey mass. But that seems to also be an illusion:”

    I know about that psilocybin research, I posted the video lecture on Unciv when it came out.

    Who cares what ‘people’ do, ‘people’ have all sorts of daft opinions about everything.

    Yes, psilocybin experience is very interesting, yes, LSD experience is very interesting, you don’t even start to trip until all the LSD has already been excreted from your body, about half an hour, yes, DMT is very interesting, your body makes it itself… but so what ? These chemicals can wake people up, show them important lessons, but it’s a temporary experience. The route via meditation is much more powerful. It means you get control. It means you learn.

    #1242

    judith
    Member
    #1263

    annie
    Participant

    Transit of Venus, Taj Mahal, Agra

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