• 3 Posts
  • 44 Comments
Joined 1 year ago
cake
Cake day: July 24th, 2023

help-circle

  • No physical mechanisms predefines future events (or is there one ?).

    So, I could state that the future does not exist yet and the past as ceased to exist.

    in that statement I have a problem with the definition of existence. Does the definition of existence exist itself ? This is (is it ?) more a problem of terminology than philosophy or physics.


  • Thanks for your time and attention.

    We have never observed anything in the universe just popping into existence from nothing (…)

    if we did, that would be a major shift in physics. in this regards I heard of (or read of) two candidates :
    .1 if universe’s expansion continues to accelerate, (it would mean) dark energy is increassing.
    .2 an excess of hydrogen (clouds) outside of galaxies was observed that is difficult to explain with current cosmology.

    I know these are not direct observation of something popping up, …but still.










  • A_A@lemmy.catoAsk Science@lemmy.worldGravity field scaling?
    link
    fedilink
    English
    arrow-up
    1
    ·
    edit-2
    1 year ago

    I did make I have made many mistakes, much worse than this one and on many occasions. I would say : don’t be so hard on yourself since it’s important to forgive ourselves.

    I do believe the following correction should be made again to your text though :

    Gravity is an [edit: inverse squared] function, so it gets weaker at an exponential a squared rate as you move away from the source.






  • What is the source of these gravitational waves?

    in my post there is a link for a powerful source of these waves but any source is good enough.

    How would rogue gravitational waves create matter?

    Here I use an analogy with the waves in the ocean that were discovered to create very strong unexpected phenomenas. When a field is strong enough it can create matter. So, it would be something similar to Hawking radiation or creation of electron positron pairs from gamma rays.

    What do you mean by “net zero energy”?

    I was most impressed by a single fact of physics that all energy in ordinary matter is equal to the negative potential gravitational energy of that matter.

    How would this [creation of matter and gravitational fields] increase the expansion of the universe?

    I read somewhere, maybe quantum gravity theories, where one creates the other, so I would have to search it again, unless someone here can help me.

    (…) black body CMB?

    Please notice that inside another comment in this post I have addressed that question.




  • @FelipeFelop@discuss.online

    Agreed, this is the most on topic post we’ve had for a while.

    We both think my post was on topic, unfortunately, ShowerThoughts moderators deleted it !

    Generally, conservation of energy applies in a closed system, so [it] wouldn’t apply at the creation of the system.

    Plus we can’t (yet) be sure what caused the Big Bang if it happened.

    Nice 😊 !

    I’ve always liked the idea that matter, space and time are the way we observe the interactions of fields. So gravity waves make an interesting idea as to how part of it might work

    Now we need a physicist and a mathematician, which obviously, I am not.