3 ms·
Interesting to note that the idea of the "Big Bounce" has been around a long time. Penrose's claim seems to be that there may be evidence of it in cosmic backgr
by defgeneric 3y ago
Interesting to note that the idea of the "Big Bounce" has been around a long time. Penrose's claim seems to be that there may be evidence of it in cosmic background radiation hotspots.
This was Nietzsche in 1885, musing on how developments in thermodynamics had complicated the mechanistic picture of the universe:
> And do you know what "the world" is to me? Shall I show it to you in my mirror? This world: a monster of energy, without beginning, without end; a firm, iron magnitude of force that does not grow bigger or smaller, that does not expend itself but only transforms itself; as a whole, of unalterable size, a household without expenses or losses, but likewise without increase or income; enclosed by "nothingness" as by a boundary; not something blurry or wasted, not something endlessly extended, but set in a definite space as a definite force, and not a space that might be "empty" here or there, but rather as force throughout, as a play of forces and waves of forces, at the same time one and many, increasing here and at the same time decreasing there; a sea of forces flowing and rushing together, eternally changing, eternally flooding back, with tremendous years of recurrence, with an ebb and a flood of its forms; out of the simplest forms striving toward the most complex, out of the stillest, most rigid, coldest forms toward the hottest, most turbulent, most self-contradictory, and then again returning home to the simple out of this abundance, out of the play of contradictions back to the joy of concord, still affirming itself in this uniformity of its courses and its years, blessing itself as that which must return eternally, as a becoming that knows no satiety, no disgust, no weariness: this, my Dionysian world of the eternally self-creating, the eternally self-destroying, this mystery world of the twofold voluptuous delight, my "beyond good and evil," without goal, unless the joy of the circle is itself a goal; without will, unless a ring feels good will toward itself-do you want a name for this world? A solution for all its riddles? A light for you, too, you best-concealed, strongest, most intrepid, most midnightly men?- This world is the will to power-and nothing besides! And you yourselves are also this will to power-and nothing besides!
- gizmo686 3y agoPenrose's theory of conformal cyclic cosmology is distinct from the big bounce theory. In the big bounce theory, the universe reaches a point where expansion slows down and eventually reverses into contraction. Then, eventually the universe reaches a high enough density where something happens and it begins expanding again in a new big bang. In conformal cyclic cosmology, the expansion never reverses. Instead, there is a bit of a mathematical trick. If you assume that all massive particles eventually decay, then at some point the universe will contain only massless particles which travel at the speed of light. In such a universe, scale becomes meaningless. That is to say, if you take a region of space that is 1 light year across and watch it evolve for 1 year; that is indistinguishable from a region that is 1 light second across evolving for 1 second. Taking this to the extreme, such a universe that is infinitely sparse is indistinguishable from one that is infinitely dense. In other words the state of our universe after infinite time is mathematically indistinguishable from the universe at the big bang. Of course, after applying that transformation, you would again see a universe with an infinite future that is also equivalent to the big bang, so you can apply the same transformation again.
- GlobalFrog 3y agoIn that case, the fact that black holes collisions/decay are visible in the ‘new’ universe means that they were breakîng this uniformity and scale invariance in the previous one, and therefore, the transformation does not happen everywhere and all at once from complete uniformity, leading to small variances that might give irregularities in matter distribution in the new universe. I’m no physicist, but is it close to the idea ? One other thing intrigues me: does this theory always lead to an inflation period in the new universe?
- hoseja 3y agoNietzsche's cyclicality is combinatorical, no? As in, given finite degrees of freedom, the entire universe will eventually go through all possible configurations and then start going through them again.