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  • JWST if it were multispectral could have proven existence of quantum fo

    From RichA@21:1/5 to All on Tue Sep 5 17:23:57 2023
    https://www.youtube.com/watch?v=uvubLp5o5Wg

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  • From Martin Brown@21:1/5 to RichA on Wed Sep 6 13:19:22 2023
    On 06/09/2023 01:23, RichA wrote:
    https://www.youtube.com/watch?v=uvubLp5o5Wg

    A surprisingly good presentation of a complex subject of the finest
    structure of spacetime on the Plank scale and well worth a watch.

    Your subject title as ever is crass and wilfully misleading.

    JWST *is* a multispectral instrument in the infra-red bands. That was
    the whole reason for building it to explore those wavebands at very high resolution. It has performed admirably in that task.

    Hubble can also do diffraction limited UV but the JWST mirrors cannot.

    Any test of quantum foam will likely be done with a pair or perhaps
    three of UV telescopes on a Michelson and Pease style rigid bar
    interferometer in orbit. The thing of interest being the presence of interference fringes on extremely remote (presumed) bright point sources
    in the hard UV. Shorter wavelengths providing a more sensitive test.

    Presumed point sources being a bit of a sticking point. Many radio
    astronomy calibrator sources are not quite good enough point sources
    (although they were when they were first chosen) now that
    interferometric scopes are so big (1 Earth diameter)!

    --
    Martin Brown

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  • From Gerald Kelleher@21:1/5 to All on Wed Sep 6 13:22:56 2023
    Nature thrives on non-periodicity and the balance between order and disorder or harmony and invention rather than the language of quantum notions of right/wrong, I/0 , is the cat dead or alive and other variations on that theme.

    I understood this over two decades ago and, true to form, mathematicians ran away from it like so many other things before.

    https://groups.google.com/g/sci.physics/c/_zO9GpWrWCI/m/GFH4NEKP1EgJ?hl=en

    It wasn't a difficulty for me as there is a specific type of geometry that covers animate and inanimate objects and especially our home planet which explodes with the Phi proportion as it resonates with spiritual and inspirational people through history.

    When I see non-periodic tiling, I see the geometric DNA of the Universe written as four angles in proportion to the main angle of 36 degrees-

    https://imgur.com/gallery/UV2tvOJ

    My heart sings as a Christian at the wonders of creation and the Spirit/Inspiration that encompasses it.

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  • From RichA@21:1/5 to Martin Brown on Thu Sep 7 11:54:05 2023
    On Wednesday, 6 September 2023 at 08:19:29 UTC-4, Martin Brown wrote:
    On 06/09/2023 01:23, RichA wrote:
    https://www.youtube.com/watch?v=uvubLp5o5Wg

    A surprisingly good presentation of a complex subject of the finest
    structure of spacetime on the Plank scale and well worth a watch.

    Your subject title as ever is crass and wilfully misleading.

    JWST *is* a multispectral instrument in the infra-red bands.

    Your idea of multispectral is highly restricted.

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  • From Quadibloc@21:1/5 to All on Thu Sep 7 12:44:02 2023
    JWST needed gold mirrors in order to work as far into the infrared as it does. We'll just have to wait for LUVOIR to get a comparable multispectral instrument.

    John Savard

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  • From Martin Brown@21:1/5 to RichA on Thu Sep 7 20:56:06 2023
    On 07/09/2023 19:54, RichA wrote:
    On Wednesday, 6 September 2023 at 08:19:29 UTC-4, Martin Brown wrote:
    On 06/09/2023 01:23, RichA wrote:
    https://www.youtube.com/watch?v=uvubLp5o5Wg

    A surprisingly good presentation of a complex subject of the finest
    structure of spacetime on the Plank scale and well worth a watch.

    Your subject title as ever is crass and wilfully misleading.

    JWST *is* a multispectral instrument in the infra-red bands.

    Your idea of multispectral is highly restricted.

    By the physics of the JWST instrument which was designed for far IR and
    has gold reflective coatings and fancy shielding for that purpose.

    A UV telescope would need optical surfaces to a much higher precision
    than its working wavelength - especially if as would be needed for the
    quantum foam test they were looking for very subtle diffraction effects.

    I will confess that until comparatively recently I had believed it was
    named after the Webb Deep Sky Society's founder Rev T. W. Webb.

    https://www.webbdeepsky.com/wbg/twwebb.html

    Author of "Celestial Objects for Common Telescopes"

    https://www.amazon.co.uk/Celestial-Objects-Telescopes-Cambridge-Collection/dp/1108014070

    --
    Martin Brown

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  • From palsing@21:1/5 to Martin Brown on Thu Sep 7 16:44:20 2023
    On Thursday, September 7, 2023 at 12:56:12 PM UTC-7, Martin Brown wrote:

    I will confess that until comparatively recently I had believed it was
    named after the Webb Deep Sky Society's founder Rev T. W. Webb.

    https://www.webbdeepsky.com/wbg/twwebb.html

    Author of "Celestial Objects for Common Telescopes"

    https://www.amazon.co.uk/Celestial-Objects-Telescopes-Cambridge-Collection/dp/1108014070

    There was, of course, an uprising in certain circles that would have preferred that the telescope be names after your"other" Webb...

    https://www.scientificamerican.com/article/nasa-needs-to-rename-the-james-webb-space-telescope/

    ... but we all know how that turned out.

    I still have my Webb Society books from many decades ago.

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  • From W@21:1/5 to palsing on Fri Sep 8 02:26:19 2023
    On Thursday, September 7, 2023 at 7:44:23 PM UTC-4, palsing wrote:

    There was, of course, an uprising in certain circles that would have preferred that the telescope be names after your"other" Webb...

    https://www.scientificamerican.com/article/nasa-needs-to-rename-the-james-webb-space-telescope/

    ... but we all know how that turned out. >

    That article calls for a real-life implementation of Roko's Basilisk.

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