Skip to main content

What is bubble universe ?

 The scientists have been made many significant discoveries to know about the origin of the universe, but they are still unsure about it. There are many theories which have explained the birth process of the universe. Well, now one new theory has been added to the list of existing theories.

As per the new research, the universe has formed in the wind-blown bubbles around a giant, long-dead star which was 40-50 times the size of the sun. The new theory named as the Bubble theory was formulated by the scientists of the University of Chicago. The theory states that the solar system formed billions of years ago near a supernova.

The Bubble Theory arises from the nature of cosmic inflation, which views the universe having expanded exponentially in the first tiny fraction of a second after the Big Bang. In this scenario of the ‘multiverse’ concept, some parts of space-time expanded faster than others. This created ‘bubbles’ of space-time. Each bubble contained a vacuum simmering with energy (variously called dark energy, vacuum energy, inflation field, or Higgs field).

The energy caused the bubbles to expand. Inevitably, some bubbles collided with each other. It’s possible that secondary bubbles were produced as well.

Each of these bubbles was a universe in its own right. The various bubbles developed into universes different from one another. The bubble that created our universe has its own laws of physics, while the other bubble-universes could have different laws.

The previous theory about the formation of the Universe, the Big Band theory informed that it was the big bang event which had happened around 10 to 20 billion years ago formed the solar system. All other things like time, energy, matter and the space in the universe were created during the time of the big bang.

The theory informed that the explosion thrust matter in all directions and that expanded the space. When it started to cool, the material in it had started combined together, and from that galaxy, planets and stars were generated.

But the nee bubble theory has given some different fact about the origin of the solar system.

The formation of the universe is related to the Wolf-Rayet star, a giant star. It is 40 to 50 times bigger than its own sun.

When the Wolf-Rayet star drops its mass, the stellar wind plows through the material that was around it. Then it formed a bubble structure with a dense shell.

The multiverse hypothesis sprang from efforts to understand our own universe’s birth. In the large-scale structure of the universe, theorists see signs of an explosive growth spurt during the cosmos’s infancy. In the early 1980s, as physicists investigated how space might have started — and stopped — inflating, an unsettling picture emerged. The researchers realized that while space may have stopped inflating here (in our bubble universe) and there (in other bubbles), quantum effects should continue to inflate most of space, an idea known as eternal inflation.

The difference between bubble universes and their surroundings comes down to the energy of space itself. When space is as empty as possible and can’t possibly lose more energy, it exists in what physicists call a “true” vacuum state. Think of a ball lying on the floor — it can’t fall any further. But systems can also have “false” vacuum states. Imagine a ball in a bowl on a table. The ball can roll around a bit while more or less staying put. But a large enough jolt will land it on the floor — in the true vacuum.

In the cosmological context, space can get similarly stuck in a false vacuum state. A speck of false vacuum will occasionally relax into true vacuum (likely through a random quantum event), and this true vacuum will balloon outward as a swelling bubble, feasting on the false vacuum’s excess energy, in a process called false vacuum decay. It’s this process that may have started our cosmos with a bang. “A vacuum bubble could have been the first event in the history of our universe,” said Hiranya peiris , a cosmologist at University College London.

But physicists struggle mightily to predict how vacuum bubbles behave. A bubble’s future depends on countless minute details that add up. Bubbles also change rapidly — their walls approach the speed of light as they fly outward — and feature quantum mechanical randomness and waviness. Different assumptions about these processes give conflicting predictions, with no way to tell which ones might resemble reality. It’s as though “you’ve taken a lot of things that are just very hard for physicists to deal with and mushed them all together and said, ‘Go ahead and figure out what’s going on,’” Braden said.

Since they can’t prod actual vacuum bubbles in the multiverse, physicists have sought digital and physical analogs of them.

One group recently coaxed vacuum bubble-like behavior out of a simple simulation. The researchers, including John preskill , a prominent theoretical physicist at the California Institute of Technology, started with “the [most] baby version of this problem that you can think of,” as co-author Ashley milsted  put it: a line of about 1,000 digital arrows that could point up or down. The place where a string of mainly up arrows met a string of largely down arrows marked a bubble wall, and by flipping arrows, the researchers could make bubble walls move and collide. In certain circumstances, this model perfectly mimics the behavior  of more complicated systems in nature. The researchers hoped to use it to simulate false vacuum decay and bubble collisions.

At first the simple setup didn’t act realistically. When bubble walls crashed together, they rebounded perfectly, with none of the expected intricate reverberations or outflows of particles (in the form of flipped arrows rippling down the line). But after adding some mathematical flourishes, the team saw colliding walls that spewed out energetic particles — with more particles appearing as the collisions grew more violent.



But the results, which appeared in a preprint in December , foreshadow a dead end in this problem for traditional computation. The researchers found that as the resulting particles mingle, they become “entangled,” entering a shared quantum state. Their state grows exponentially more complicated with each additional particle, choking simulations on even the mightiest supercomputers.

For that reason, the researchers say that further discoveries about bubble behavior might have to wait for mature quantum computers — devices whose computational elements (qubits) can handle quantum entanglement because they experience it firsthand.

Meanwhile, other researchers hope to get nature to do the math for them.

Michael spannowsky and Steven Abel  physicists at Durham University in the United Kingdom, believe they can sidestep the tricky calculations by using an apparatus that plays by the same quantum rules that the vacuum does. “If you can encode your system on a device that’s realized in nature, you don’t have to calculate it,” Spannowsky said. “It becomes more of an experiment than a theoretical prediction.”



That device is known as a quantum annealer. A limited quantum computer, it specializes in solving optimization problems by letting qubits seek out the lowest-energy configuration available — a process not unlike false vacuum decay.

Using a commercial quantum annealer called D-Wave, Abel and Spannowsky programmed a string of about 200 qubits to emulate a quantum field with a higher- and a lower-energy state, analogous to a false vacuum and a true vacuum. They then let the system loose and watched how the former decayed into the latter — leading to the birth of a vacuum bubble.

The experiment, described in a preprint  last June, merely verified known quantum effects and did not reveal anything new about vacuum decay. But the researchers hope to eventually use D-Wave to tiptoe beyond current theoretical predictions.

A third approach aims to leave the computers behind and blow bubbles directly.

Quantum bubbles that inflate at nearly light speed aren’t easy to come by, but in 2014, physicists in Australia and New Zealand proposed a way  to make some in the lab using an exotic state of matter known as a Bose-Einstein condensate (BEC). When cooled to nearly absolute zero, a thin cloud of gas can condense into a BEC, whose uncommon quantum mechanical properties include the ability to interfere with another BEC, much as two lasers can interfere. If two condensates interfere in just the right way, the group predicted, experimentalists should be able to capture direct images of bubbles forming in the condensate — ones that act similarly to the putative bubbles of the multiverse.



“Because it’s an experiment, it contains by definition all the physics that nature wants to put in it including quantum effects and classical effects,” Peiris said.

Peiris leads a team of physicists studying how to steady the condenasate blend against collapse from unrelated effects. After years of work, she and her colleagues are finally ready to set up a prototype experiment, and they hope to be blowing condensate bubbles in the next few years.

If all goes well, they’ll answer two questions: the rate at which bubbles form, and how the inflation of one bubble changes the odds that another bubble will inflate nearby. These queries can’t even be formulated with current mathematics, said Braden, who contributed to the theoretical groundwork for the experiment.

That information will help cosmologists like Braden and Peiris to calculate exactly how a whack from a neighboring bubble universe in the distant past might have set our cosmos quivering. One likely scar from such an encounter would be a circular cold spot in the sky, which peiris  and other have searched for  and not found. But other details — such as whether the collision also produces gravitational waves — depend on unknown bubble specifics.

If the multiverse is just a mirage, physics may still benefit from the bounty of tools being developed to uncover it. To understand the multiverse is to understand the physics of space, which is everywhere.

False vacuum decay “seems like a ubiquitous feature of physics,” Peiris said, and “I personally don’t believe pencil-and-paper theory calculations are going to get us there.”

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 ...

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 ...

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  ( ...