Skip to main content

what happens if there is big crunch

The Big Crunch is a hypothetical scenario for the ultimate fate of the universe , in which the expansion of the universe  eventually reverses and the universe recollapses, ultimately causing the cosmic scale factor  to reach zero, an event potentially followed by a reformation of the universe starting with another Big bang . The vast majority of evidence indicates that this theory is not correct. Instead, astronomical observations show that the expansion of the universe is accelerating , rather than being slowed by gravity, suggesting that the universe is far more likely to end in heat death or a Big Rip .

big crunch



The Big Crunch scenario hypothesized that the density of matter throughout the universe is sufficiently high that gravitational attraction will overcome the expansion which began with the Big Bang. The FLRW cosmology  can predict whether the expansion will eventually stop based on the average energy density , Hubble parameter , and cosmological constant . If the metric expansion stopped, then contraction will inevitably follow, accelerating as time passes and finishing the universe in a kind of gravitational collapse . 


crunch


A more specific theory called "Big Bounce " proposes that the universe could collapse to the state where it began and then initiate another Big Bang, so in this way the universe would last forever, but would pass through phases of expansion (Big Bang) and contraction (Big Crunch).

Experimental evidence in the late 1990s and early 2000s (namely the observation of distant supernovae as standard candles , and the well-resolved mapping of the cosmic microwave background ) led to the conclusion that the expansion of the universe is not being slowed by gravity but is instead accelerating . The 2011 Nobel Prize in Physics  was awarded to researchers who contributed to making this discovery.


big crunch


Physicist Roger Penrose  advanced a general relativity based theory called the conformal cyclic cosmology in which the universe expands until all the matter decays and is turned to light. Since nothing in the universe would have any time or distance scale associated with it, it becomes identical with the Big Bang (resulting in a type of Big Crunch which becomes the next Big Bang, thus starting the next cycle). Penrose and Gurzadyan suggested that signatures of conformal cyclic cosmology could potentially be found in the cosmic microwave background ; as of 2020, these have not been detected.


big rip


Paul Davies  considered a scenario in which the Big Crunch happens about 100 billion years from the present. In his model, the contracting universe would evolve roughly like the expanding phase in reverse. First, galaxy clusters , and then galaxies, would merge, and the temperature of the cosmic microwave background  (CMB) would begin to rise as CMB photons get blueshifted . Stars would eventually become so close together that they begin to collide with each other. Once the CMB becomes hotter than M-type stars  (about 500,000 years before the Big Crunch in Davies' model), they would no longer be able to radiate away their heat and would cook themselves until they evaporate; this continues for successively hotter stars until O-type stars  boil away about 100,000 years before the Big Crunch. In the last minutes, the temperature of the universe would be so great that atoms  and atomic nuclei  would break up and get sucked up into already coalescing black holes . At the time of the Big Crunch, all the matter in the universe would be crushed into an infinitely hot, infinitely dense singularity  similar to the Big Bang . The Big Crunch may be followed by another Big Bang, creating a new universe.

Comments

Popular posts from this blog

what is secret of 369

  The number 3 serves as the only number that equals the sum  of  all preceding numbers (0 + 1 + 2 = 3). Also, when 3 is added to itself, the smallest perfect number ensues (6). And when 3 is squared, the result is the number that completes the single-digit numbers in the decimal system, better known as the number 9 why 369 is universe of key ? Nikola Tesla was obsessed with numbers, but especially 3, 6 and 9. He wanted the world to know the significance of the number 3 6 9, he claimed that these were extremely important numbers, but the question is why? What was that Nikola Tesla wanted the world to understand? How it became Nikola Tesla 3 6 9 theory? To understand that, we must first know about Mathematics. Why it is so different yet the same anywhere in the universe. Maths was and has been the most valued subject of all the time and the most powerful too. Two plus two will always be four everywhere in the universe. Possibly Nikola Tesla knew the power of the numbers 3 ...

Anthropic principle

  The   anthropic principle   is the principle that there is a restrictive lower bound on how statistically probable our observations of the universe are, given that we could only exist in the particular type of universe capable of developing and sustaining sentient life.   Proponents of the anthropic principle argue that it explains why this universe has the  age  and the  fundamental physical constants    necessary to accommodate conscious life, since if either had been different, we would not have been around to make observations. Anthropic reasoning is often used to deal with the notion that the universe seems to be  fine tuned . There are many different formulations of the anthropic principle. Philosopher Nick Bostrom  counts them at thirty, but the underlying principles can be divided into "weak" and "strong" forms, depending on the types of cosmological claims they entail. The  weak anthropic principle  ( ...

Kardashev scale

  The   Kardashev scale   is a method of measuring a  civilization ' s level of technological  advancement based on the amount of energy  it is able to use. The measure was proposed by   Soviet    astronomer   Nikolai    Kardashev    in 1964. The scale is hypothetical , and regards energy consumption on a cosmic  scale. Various extensions of the scale have since been proposed, including a wider range of power levels (types 0, IV through VI) and the use of metrics other than pure power. Categories  The Kardashev scale has three designated categories, these are: A  Type I civilization , also called a planetary civilization , can use and store all of the energy available on its planet.  A  Type II civilization , also called a stellar    civilization , can use and control energy at the scale of its planetary system. A  Type III ...