HomeScienceDark energy could lead to a second (and third, and

Dark energy could lead to a second (and third, and

master mentalism tricks

Will the universe end in a bang or a whimper? A pair of theoretical physicists have proposed a third path: perhaps the universe will never end.

In a study that attempts to define the nature of dark energy — a mysterious phenomenon thought to be causing the universe to expand faster and faster every moment — the physicists find that cosmic expansion isn’t always a given. Rather, they write, dark energy may periodically “switch” on and off, sometimes growing the cosmos, sometimes shrinking it down until the conditions are right for a new Big Bang to occur — and for a new universe to be born. 

The great escape

Our universe is currently experiencing a phase of runaway expansion: the cosmos is getting bigger faster with every passing moment. Cosmologists do not understand the cause of this acceleration, which they name dark energy. If this acceleration persists, then our universe will eventually expand into oblivion, with all matter and radiation torn apart.

This wouldn’t be the first period of runaway growth. In the earliest moments of the Big Bang, the energies and densities were so extreme that existing physics cannot cope — it predicts a singularity, a point of infinite density where the math breaks down. After that, the universe experienced a period of incredibly rapid expansion known as inflation, which is also poorly understood.

Astronomers have long wondered if these two phases of accelerated expansion — one in the earliest moments of the Big Bang and one in the present epoch — are connected to each other, and whether an entity that drives both of them avoids the problem of the big bang singularity.

Dynamical demons

To answer that, a pair of theoretical physicists published a study Feb. 7 in the preprint database arXiv (opens in new tab) which examined a model of the universe where dark energy has always played a role. Previous research modeled dark energy “switching on” at various times to drive cosmic expansion, but the new research proposes a more realistic model that includes matter and radiation.

They wanted to see if dark energy can avoid a Big Bang singularity, drive inflation, and accelerate the late universe. To avoid that initial singularity, the universe can’t begin from a point of infinite density. Instead, the universe we live in would have to be one in an infinite series of repeated “Big Bounces.”

In this scenario, dark energy drives the universe until it reaches a certain size. But then the dark energy transforms itself, forcing the universe to contract. The cosmos then suffers a big crunch, but right before reaching a state of infinite density, dark energy turns around again, driving a period of incredibly rapid inflation and starting the cycle anew.

A finely tuned mechanism

The researchers found a model of dark energy that performed the trifecta. But crucially, matter and radiation could not be present in the extremely early universe, otherwise they spoiled inflation. Instead, matter and radiation had to appear just after inflation, as a portion of the dark energy decayed away, flooding the universe with light and matter. 

While initially successful, the researchers weren’t able to find a generic class of dark energy models that could always lead to the same results. Instead, they had to artificially put in a smaller value for the present-day accelerated expansion than quantum mechanics predicts in order to get the exact right outcome.

However, this new research does point in a promising direction, providing a viable platform for further exploring models like this. Humans are not necessarily destined to live in a cold, empty cosmos, because dark energy might behave differently in the far future. Only continued research will uncover our ultimate fate. 

Read The Full Article Here

trick photography

Popular posts

Ray Stevenson, ‘Punisher: War Zone’ and ‘RRR’ Star, Dies at
Master Gardener review – a prickly character study
Max Streaming Service Officially Launches
Deadpool 3 Cast Expands With 2 Returning Actors Joining MCU
‘The Challenge’ Turns 25: 7 Controversies From the MTV Show
‘And Just Like That’ Season 2 Trailer Reveals Aidan’s Back
Wedding Season Explores The Perfect Moment and Relationship Lessons
FROM Season 2 Episode 6 Review: Pas de Deux
The Mars Volta Singer Tells Danny Masterson to ‘Rot in
Deep Purple’s Roger Glover Addresses Ritchie Blackmore Reunion Rumor
Guns N’ Roses Play ‘Appetite’ + ‘Use Your Illusion’ Deep
Watch billy woods and ShrapKnel’s New “Babylon by Bus” Video
Not All Shoes and Skirts Work Together, But These 6
I Just Tried On Tons of New-In Zara Pieces—These Were
Jennifer Lawrence Cannes: Why She Wore Flip-Flops On the Red
The Beauty Products in Succession Speak Volumes About Quiet Luxury
8 Gorgeous Greek Mythology Romance Books
Book Riot’s Deals of the Day for May 25, 2023
Neil Turner on Writing a Series Versus a Standalone Novel
Washington Post Finds That Rise in Book Challenges of LGBTQ+
Protein-based nano-‘computer’ evolves in ability to influence cell behavior
Save over $280 on this Surface Pro 9 bundle
Do all animals go through adolescence?
Bionic Finger ‘Sees’ Inside Objects by Poking Them
Irresistible Diwali Offers on Samsung Galaxy A Series Smartphones that
This $200 Home Coffee Grinder Almost Does It All
iPad Pro With Apple M2 SoC, 5G Connectivity Launched in
The 7 Best Heart Rate Monitors for Exercise and Fitness