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Posts posted by geordief

  1. 16 minutes ago, Luc Turpin said:


    Yes, if life has no meaning, then we are left with making our own sense of, and emphasise rationality and logic in doing so!

    .....our own sense of it, and emphasize........

    No ,the life we see around us follows logical paths .(animals,trees,humans,societies and the physical universe)

    The senselessness I had in mind was the apparent void we come from  at birth and the void we enter after we are finished.

    In between we try to understand  what our place is in that context.

    I doubt other species entertain these ideas but ,who knows maybe they might.

  2. 13 minutes ago, Genady said:


    In the spacetime, they both have curvature of about 1 lightyear radius:


    Thanks.I did track down that passage in the  book.

    For those of us who find it hard to visualise a curved 4d (3d+time) object  is the way to do this to break the 4d down into  all its 2d surfaces?

    Would every surface need to be curved for the 4d object to be classed as such?

    Or could in theory only one of eg spatial surfaces be curved and all the other surfaces be "straight" and the 4d construct would also be curved?(not that I expect such a thing to exist in nature)

  3. 5 hours ago, Genady said:

    The main problem with the trampoline analogy is that it has nothing to do with the gravity related spacetime curvature. A curious student should ask after watching it, 

    "How can the tracks of a ball and of a bullet be curved so differently if that curvature arises from the geometry of space?" (MTW, Gravitation (p. 32).)


    Because it is spacetime that is curved and not space?

  4. 19 minutes ago, Bufofrog said:

    It's just an analogy.  No analogies will completely describe the actual phenomena 

    Yes ,it is intended to be an analogy. 

    But analogies can perhaps be useful as a way of getting a clearer  understanding of the actual phenomena or just encouraging further inquiry.

    So, can some analogies be better than others?

    The trampoline analogy has the  fault ,if taken literally**of mistaking an effect if gravity for gravity itself.

    If that is disregarded  it is a lot "catchier" than mine -maybe too catchy for it's own good.


    **of course students should be repeatedly warned that it is just a flawed analogy (as all analogies  intrinsically are)

  5. One of the main arguments against the trampoline analogy for spacetime  curvature  is that the heavy object distorting the fabric of the trampoline/spacetime fabric itself relies on gravity to act ...

    Suppose we just have two bodies ,one of which is a source of mass/energy and they are connected by a geometric line  that is marked off in equal lengths of spacetime distance.

    There is  a tension between the two objects (and so along the geometric line?) for the "simple" reason * *that the two objects have  in principle a common source at the beginning of the universe ,whatever that looked like.

    Going back to the two objects,as time progresses the massive/energetic object "pulls on " the geometric line representing spacetime  and "reels it in" like a measuring tape that springs back into the body of the tool.

    But the line is held at the location of the second body  and ,moreover is elastic .

    And so the spacetime intervals written on the  geometric line are stretched on the side of the massive body and this stretching is continues all the way along the geometric line  as far as the second body,with the distortion from the ideal even spacing greatest  in the immediate vicinity of the massive body ,but still existing (propagating?) as far as the second body ,or indeed to infinity if that  is where the second body is.

    This is different from the trampoline analogy in the it just deals with one spatial  dimension (at a time).

    The idea occured to me as I have been forced to wear  compression stockings for now  and when you pull them up the leg it looks a bit like stretching  a trampoline or spacetime fabric in action:-)


    Also ,in the What is Gravity thread  a few of you are talking about whether spacetime curvature can cause mass or vice versa.

    In "my" analogy  the mass can "ingest" spacetime  and so it "causes" it.

    And the stretchy geometric  line (spacetime) cause the second object to move relative to the massive object.


    **well,I think both these objects have a prior relationship  and so a "historic" connection in that sense

  6. 58 minutes ago, Genady said:

    This is the difference in our approach: I think that my consciousness is a symbolic reflection of my experiences. The experiences, including thoughts and concepts, are not conscious.

    Do I sound like an extreme monist?

    And you would be a mainstream monist ,perhaps?

    I am only slightly familiar with these concepts

    https://www3.nd.edu/~maritain/jmc/etext/psych023.htm#:~:text=Dualism teaches that Mind and,one and the same Reality.


    but ,from the link there seem to be quite a few variations...


    I think I would be attracted to what you say is not the case

    1 hour ago, Genady said:

    The experiences, including thoughts and concepts, are not conscious.

    I think consciousnesss could be extensive in the same way as a particle extends into its field according to QFT.


    (of course I am waffling)


  7. 8 minutes ago, Genady said:

    My consciousness records these experiences.

    I think more along the lines that your consciousness  is those experiences.


    There is nothing  "hands off" about what I think of as consciousness.It is entirely immersive , athough there is an illusion of an "internal observer". which is just a facet of our consciousness.

  8. 2 minutes ago, Genady said:

    Yes, its functioning changes. And sometimes stops.

    You are thinking of a coma?

    19 minutes ago, Genady said:

    Consciousness does not have amount or direction. It is a symbolic system of recording experiences.

    So if you have an experience where "nothing could be better" (as in the oft quoted line"it was bliss that day to be alive" ) and this is followed by the depths of despair   (perhaps as a result of a medical condition) your consciousness does not follow any direction? 


    In the former experience all your days lie ahead of you in anticipation  and in the later there is no tomorrow.


    Is your consciousness  diminished or altered? 

  9. 31 minutes ago, Luc Turpin said:


    Body instead of consciousness as source of knowledge - interesting.  Based on the interpretation of some newer evidence, I would rather say "body as a source of consciousness."

    Perceived body and perceived world could not be disentangled from each other - very interesting.  Context, interelationship... all of this matters to fully understand.

    Guess you will have to eat the room as well as the elephant; and the building containing the room; and the world containing the building.

    So ,if we lose a hair off our head we loose (just change?) a bit of our consciousness(as well as when  there is a change in the environment such as the sun going behind a cloud)?


    Can we increase or decrease our amount of consciousness or is it just redirected/reoriented?

    Do emotions affect our consciousness?


  10. 5 hours ago, Eise said:

    Nicely put. I also do not know of masses that do not have a gravitational field, resp without 'curving' spacetime. And that is an important reason for me not to see a causal relationship between mass and curved spacetime. 

    Can we bottle (or just create) spacetime curvature and thereby  create (or annihilate) mass?

    That might  be a causal relationship. 

  11. 12 minutes ago, swansont said:

    Not even that long, I suspect. Dense-packing the trees seems to stimulate growth for the few years observed, but what happens as the trees (literally) branch out? Will the proximity impede growth? What happens as their root systems start interfering with each other - will you run into issues if water is scarce?

    I assumed they would be thinned at an earlyish  stage(no idea  how  they develop after that)


    Here is their website  https://www.facebook.com/KBtreegang/


    There is not much specificity regarding  the aims of the project,but increasing local bio diversity seems to figure as one of the main aims  and the fast rate of initial growth attracted the attention of the national broadcaster,I guess.  



    18 minutes ago, Genady said:

    Even without water issues, the growing roots of Ficus tree in my yard have killed over the years surrounding coco palms, one by one.

    Yes I have read that some plants are able to attack the roots of competitors chemically.I am forever weeding  the scutch from my strawbs  for that reason  but without noticeable benefit. 

  12. Just now, exchemist said:

    I ran my 3G iPhone, the original Jonathan Ive design, until last year. I replaced with the smallest modern iPhone I could get (SE), which is still a bit too long to be ideal but better than the others. I do most of my internet stuff on the laptop or iPad, not the phone, so I have no use for a large screen on the phone. 

    It was strange when I went to the Vodafone shop this week with the intention of buying a new phone  and ,except for really expensive  models there was nothing they could offer me under 6 inches. 

    Looking online ,I had no more luck


    I am pretty surprised that these large sizes are what people seem to want ..


    Yes  I think IPhones seem to be available in smaller sizes  than eg Samsung.


  13. https://www.rte.ie/news/2024/0308/1436684-trees-climate/


    "The Tiny Forest concept was pioneered by a Japanese botanist, Akira Miyawaki. He pioneered a special method of planting and ground preparation that can be used to grow forests ten times faster than a typical forest (which usually takes 200 to 300 years"


    "Usually up to five saplings are planted for every square metre and as a result, the trees are forced to grow upwards for sunlight instead of spreading outwards"

  14. 51 minutes ago, exchemist said:

    Get the smallest you can. Then there is some chance you can the damned thing into a pocket. 

    It is difficult to get a small one.I got this by going to a reconditioned phone website.

    It is 2017 and a 4 inch screen.

    There was an awful problem getting a battery for it  ,though (the battery it came with was on its last legs) as they don't ship them in aircraft any more and I had to visit phone stores around town to look for old batteries  from broken phones.

    I prefer these smaller screens  for convenience even though they are no doubt harder to read.

  15. 1 hour ago, J.C.MacSwell said:

    I can see it now..."High sperm count men in the lifeboats first!"

    Woody Allen might need some kind of a disclaimer before screenings of his "All you Wanted to Know about Sex but were Afraid to Ask."

    "No human beings were massacred or demeaned in the  making of this movie"

  16. 1 hour ago, John Cuthber said:

    mean that it's impossible to define your speed with respect to a vacuum

    If the vacuum  is filled with quantum foam (a big "if" ,as I don't understand what that means) could an object's speed/velocity be referred to different locations in that quantum foam?

    Does the term "location" not apply ,perhaps wrt quantum foam?

    Said in another way ,could  the quantum foam be considered to be  a medium?

  17. 5 minutes ago, StringJunky said:

    Trump's down for another judgement of $350m-ish. The judgement summary:


    Seems a lot but the prosecution's case was that it was representative of the profit he made on his misrepresentations.

    I think he should  be fined extra just for being who he is.

    We should give him the witch hunt he claims he is getting.


    (Has he claimed Brit Ekland was  begging for it yet?)

  18. https://www.bbc.com/news/science-environment-68221243

    "Three students have won a $700,000 prize after using AI to read a 2,000-year-old scroll burnt during the Mount Vesuvius eruption in 79AD."

    This is a great story .A few years back there was talk as to whether these (or similar scrolls) would be legible and now there seems a lot of optimism because of new technology available .


  19. 1 hour ago, StringJunky said:

    But have you got the obligatory Hunter wellington boots and Barbour jacket in the boot?

    I  normally  go around  wearing  wellies and a Barbour Jacket (but only drive a small Toyota Yaris )

    The man at the  shop checkout did point out that it was a cool outfit.

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