Big rip Definition and 30 Threads

In physical cosmology, the Big Rip is a hypothetical cosmological model concerning the ultimate fate of the universe, in which the matter of the universe, from stars and galaxies to atoms and subatomic particles, and even spacetime itself, is progressively torn apart by the expansion of the universe at a certain time in the future, until distances between particles will become infinite. According to the standard model of cosmology the scale factor of the universe is accelerating and, in the future era of cosmological constant dominance, will increase exponentially. However, this expansion is similar for every moment of time (hence the exponential law – the expansion of a local volume is the same number of times over the same time interval), and is characterized by an unchanging, small Hubble constant, effectively ignored by any bound material structures. By contrast in the Big Rip scenario the Hubble constant increases to infinity in a finite time.
The possibility of sudden rip singularity occurs only for hypothetical matter (phantom energy) with implausible physical properties.

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  1. T

    I Can the big rip ever be ruled out?

    In order for the big rip to happen, the dark energy equation of state w must be more negative than -1, allowing dark energy density to grow. https://en.m.wikipedia.org/wiki/Big_Rip According to Wikipedia, the current observed w value is very close to -1 but it acknowledges that there is...
  2. curious222

    B Universe Discovery: The Finite Theory of the Big Bang and the End of the Cosmos

    https://www.google.com/amp/s/www.express.co.uk/news/science/1216872/universe-discovery-end-of-the-universe-finite-big-bang-theory-cosmos / amp
  3. Y

    I How does the expansion of the Universe affect black holes?

    I realize that my understanding of this matter and it's vast number of related concepts is rudimentary and incomplete. Kindly forgive my ignorance and try to explain your thoughts in layman's terms. Thank you for your time.
  4. DavidCummings

    I Does the newly measured expansion rate change the odds for Big Rip?

    Is the likelihood (or unlikelihood) of a Big Rip changed by the new findings of faster universe expansion (https://www.sciencedaily.com/releases/2019/04/190425104128.htm). In https://www.physicsforums.com/threads/will-the-big-rip-basically-be-the-big-bang-for-the-next-universe.971039/, phinds...
  5. S

    I Will the Big Rip basically be the Big Bang for the next universe?

    I was reading that the Big Rip will cause the whole universe to go singular, which sounds to me like another Big Bang. I was reading up on the Big Rip at Wikipedia, where it says that the observable universe is getting smaller, which makes no sense since the universe is expanding. :oldconfused:
  6. S

    B Big Rip Theory & Black Holes: Relativity Explained

    According to the Big rip theory if Black holes tear apart after a very long time, then according to the theory of relativity an object that reaches the event horizon should see time passing infinitelty and by the time the object was swallowed wouldn't the black hole not exist anymore because of...
  7. J

    I Big rip - order of distintegration?

    In the big rip scenario, many of the documentaries and explanations have always said that galaxies would dissipate first. Why is that? wouldn't everything go at once? or is it because galaxies require the most amount of gravity to keep it together
  8. FelixH

    B What would a timeline for the Big Rip look like?

    If the universe were to end with the Big Rip scenario, Would the milky way still exist up until the Big Rip? If so, how long would it take for the Milky Way, Earth and Humans to be ripped apart? (eg. How long from when we start feeling something to all atoms being separate) Would humans survive...
  9. S

    The Big Rip - new evidence for it?

    Bulk viscosity is a factor now claimed to support the big rip scenario. Its nearly a year old, but an intriguing story nonetheless, as detailed in the guardian: https://www.theguardian.com/science/2015/jul/02/not-with-a-bang-but-with-a-big-rip-how-the-world-will-end and for any with access...
  10. Ryan Reed

    Quark Overproduction in the Big Rip Theory

    In the big rip theory, the force of dark energy isn't constant and increases over time. This causes first galaxies to fly apart, then solar systems, then planets, then stars, then atoms, then the atom nuclei. If it keeps increasing, it would start pulling the quarks inside protons and neutrons...
  11. L

    Would the Big Rip make time stop?

    Would an accelerating expansion create any time dilation effects? And once the expansion velocity between any two adjacent points reached c would time stop altogether?
  12. Y

    Big Bang, big rip, lQc, has anyone ever run a computer simulation?

    I have a question regarding LQC that I can't find anywhere, and since most of the relevant answers to similar questions are here I may as well ask, here... For a simple background, when I was introduced to the big rip and combined that with the big bang, I immediately thought the two co-existed...
  13. Islam Hassan

    Big Rip Compatible with Flat Universe?

    Is there a fundamental incompatibilty between a flat universe and the possibility of a Big Rip-type scenario of the evolution of the universe? Does a Big Rip necessarily imply a hyperbolic universe? What relationship is there -if any- between the shape of the universe and the equation of...
  14. C

    Big Rip Cosmology and Many-Worlds Quantum Mechanics

    My question is based on two theoretical assumptions. 1) The universe continues with its expansion resulting in an eventual "Big Rip". 2)The many-worlds interpretation of quantum mechanics is correct. In this scenario will all the "branches of reality" in the many-worlds undergo the "Big Rip"...
  15. N

    Could the Big Rip Lead to Another Big Bang?

    Hi, In the "Big Rip" scenario, the expansion of spacetime increases exponentially. As a result, it will torn apart galaxies, later the system solar, then the Earth itself, atoms... If the expansion keeps on increasing, at some point would it be strong enough to separate virtual particles...
  16. F

    The cosmological Big Rip and a shrinking hubble radius

    The cosmological "Big Rip" and a shrinking Hubble radius Doesn't an expanding universe forecast such outcomes as a faded and unobservable cmb, galaxies moving away from each other greater than the speed of light, a gravitationally unbound solar system, and eventually an observable universe...
  17. E

    How would the Big Rip scenario interact with virtual particles?

    If virtual particles were prevented from annihilating fractions of a second before the Big Rip itself is actually achieved, wouldn't the universe be flooded with real particles creating an incredible amount of mass? 1) This idea is incorrect 2) The idea is correct and it temporarily delays the...
  18. Z

    Why is there no consensus on the big rip?

    We all know that the Hubble equations tell us that in a vacuum dominated universe, that the scale factor will expand exponentially. H^2 = (da/dt)^2 * 1/a^2 Ha = da/dt a = e^(Ht) Where proper distance is d = aΔx v = Hd v = HaΔx <- The velocity between any two points in space is...
  19. D

    Cyclic Universe, Big Rip version

    I wonder if someone has ever considered the following scenario: 1. "Standard" Big Rip model (phantom energy-dominated) 2. Close to the Big Rip, Universe becomes crossed with Cosmological horizons 3. Based on semiclassical approach, these horizons emit Hawking radiation 4. As a (slightly...
  20. D

    The fate of the Universe - big rip, then big crunch?

    I envision the Universe to be like a stellar sized star. When it expands, it explodes into a supernova, then collapses/contract into a black hole singularity. Since the Universe rate of expansion is accelerating, would it rip apart, and then contract into a singularity, just like the star?
  21. T

    The Big Rip: Will Black Holes Be Ripped Apart Too?

    Question about "The Big Rip" With dark energy accelerating the expansion of the Universe, has anyone done calculation on how long it will take for black holes to be ripped apart? I'm assuming here that space is going to be expanding so fast that the acceleration of the material towards itself...
  22. J

    Discussing the Big Rip Theory: Have You Heard About It?

    Somewhere, I read about the "Big Rip Theory". Has anyone here heard about the Big Rip Theory? Joe L. Ogan
  23. MTd2

    Does the big rip happen in LQC?

    Does anyone know?
  24. P

    Do You Believe in the Big Rip Theory?

    ... R.I.P... rest in peace? I would be interested to know how many of you accept this theory as the probable fate of our universe. For me, this is probably one of the harder ideas to swallow because even if it is true, the idea of everything ceasing to exist is hard!
  25. K

    How Does Infinite Density Lead to the Big Rip?

    Hello, in the eqn of state [density prop. to a^-3(W+1)] if you subbed in W=-2 you get density prop. to a^3. If you then plot a graph of density vs. scale factor it is a straight-forward graph. Good up until then, but then I got the interpretation wrong. This represents the "big rip". But how? I...
  26. M

    Big Crunch or Big Rip? Universe's Future

    I remember reading some time ago that in 2001, they discovered that the speed at which the universe was expanding was accelerating. According to current models, that would mean that the universe may expand forever and maybe even rip itself apart. But then, there is still some debate as to...
  27. K

    Big Rip Red Sky? - Universe's Fate Explored

    Hi, I'm curious about one thing. Suppose the universe will end in a Big Rip. Then since the universe will be accelerating at a very fast rate, could it be that the sky will look redder and redder towards the Big Rip?
  28. W

    Exploring the Possibilities: The Fate of Our Universe - Big Crunch or Big Rip?

    How do you think our universe will end like? I think it would be the Big crunch! One evidence is that the amount of mass in stars divided by the total amount of mass in the universe is nonzero. After some length of time, any given star will convert too much hydrogen into helium (or heavier...
  29. Ivan Seeking

    Universe can surf the Big Rip; Nature article

    http://www.nature.com/nsu/030609/030609-7.html
  30. J

    What exactly will happen if the big rip occurs

    What exactly will happen if the big rip occurs. I understand that all matter will be torn apart. But I still don't think that I fully understand. What will happen to the matter after it is ripped apart. It can't just disappear can it.
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