A deeply disturbing and controversial line of thinking has emerged within the physics community.

It's the idea that we are reaching the absolute limit of what we can understand about the world around us through science.

“The next few years may tell us whether we'll be able to continue to increase our understanding of nature or whether maybe, for the first time in the history of science, we could be facing questions that we cannot answer,” Harry Cliff, a particle physicist at the European Organization for Nuclear Research — better known as CERN — said during a recent TED talk in Geneva, Switzerland.

Science news in pictures Show all 20 1 /20 Science news in pictures Science news in pictures Pluto has 'beating heart' of frozen nitrogen Pluto has a 'beating heart' of frozen nitrogen that is doing strange things to its surface, Nasa has found. The mysterious core seems to be the cause of features on its surface that have fascinated scientists since they were spotted by Nasa's New Horizons mission. "Before New Horizons, everyone thought Pluto was going to be a netball - completely flat, almost no diversity," said Tanguy Bertrand, an astrophysicist and planetary scientist at NASA's Ames Research Center and the lead author on the new study. "But it's completely different. It has a lot of different landscapes and we are trying to understand what's going on there." Getty Science news in pictures Over 400 species discovered this year by Natural History Museum The ancient invertabrate worm-like species rhenopyrgus viviani (pictured) is one of over 400 species previously unknown to science that were discovered by experts at the Natural History Museum this year PA Science news in pictures Jackdaws can identify 'dangerous' humans Jackdaws can identify “dangerous” humans from listening to each other’s warning calls, scientists say. The highly social birds will also remember that person if they come near their nests again, according to researchers from the University of Exeter. In the study, a person unknown to the wild jackdaws approached their nest. At the same time scientists played a recording of a warning call (threatening) or “contact calls” (non-threatening). The next time jackdaws saw this same person, the birds that had previously heard the warning call were defensive and returned to their nests more than twice as quickly on average. Getty Science news in pictures Turtle embryos influence sex by shaking The sex of the turtle is determined by the temperatures at which they are incubated. Warm temperatures favour females. But by wiggling around the egg, embryos can find the “Goldilocks Zone” which means they are able to shield themselves against extreme thermal conditions and produce a balanced sex ratio, according to the new study published in Current Biology journal Ye et al/Current Biology Science news in pictures Elephant poaching rates drop in Africa African elephant poaching rates have dropped by 60 per cent in six years, an international study has found. It is thought the decline could be associated with the ivory trade ban introduced in China in 2017. Reuters Science news in pictures Ancient four-legged whale discovered in Peru Scientists have identified a four-legged creature with webbed feet to be an ancestor of the whale. Fossils unearthed in Peru have led scientists to conclude that the enormous creatures that traverse the planet’s oceans today are descended from small hoofed ancestors that lived in south Asia 50 million years ago A. Gennari Science news in pictures Animal with transient anus discovered A scientist has stumbled upon a creature with a “transient anus” that appears only when it is needed, before vanishing completely. Dr Sidney Tamm of the Marine Biological Laboratory could not initially find any trace of an anus on the species. However, as the animal gets full, a pore opens up to dispose of waste Steven G Johnson Science news in pictures Giant bee spotted Feared extinct, the Wallace's Giant bee has been spotted for the first time in nearly 40 years. An international team of conservationists spotted the bee, that is four times the size of a typical honeybee, on an expedition to a group of Indonesian Islands Clay Bolt Science news in pictures New mammal species found inside crocodile Fossilised bones digested by crocodiles have revealed the existence of three new mammal species that roamed the Cayman Islands 300 years ago. The bones belonged to two large rodent species and a small shrew-like animal New Mexico Museum of Natural History Science news in pictures Fabric that changes according to temperature created Scientists at the University of Maryland have created a fabric that adapts to heat, expanding to allow more heat to escape the body when warm and compacting to retain more heat when cold Faye Levine, University of Maryland Science news in pictures Baby mice tears could be used in pest control A study from the University of Tokyo has found that the tears of baby mice cause female mice to be less interested in the sexual advances of males Getty Science news in pictures Final warning to limit "climate catastrophe" The Intergovernmental Panel on Climate Change has issued a report which projects the impact of a rise in global temperatures of 1.5 degrees Celsius and warns against a higher increase Getty Science news in pictures Nobel prize for evolution chemists The nobel prize for chemistry has been awarded to three chemists working with evolution. Frances Smith is being awarded the prize for her work on directing the evolution of enzymes, while Gregory Winter and George Smith take the prize for their work on phage display of peptides and antibodies Getty/AFP Science news in pictures Nobel prize for laser physicists The nobel prize for physics has been awarded to three physicists working with lasers. Arthur Ashkin (L) was awarded for his "optical tweezers" which use lasers to grab particles, atoms, viruses and other living cells. Donna Strickland and Gérard Mourou were jointly awarded the prize for developing chirped-pulse amplification of lasers Reuters/AP Science news in pictures Discovery of a new species of dinosaur The Ledumahadi Mafube roamed around 200 million years ago in what is now South Africa. Recently discovered by a team of international scientists, it was the largest land animal of its time, weighing 12 tons and standing at 13 feet. In Sesotho, the South African language of the region in which the dinosaur was discovered, its name means "a giant thunderclap at dawn" Viktor Radermacher / SWNS Science news in pictures Birth of a planet Scientists have witnessed the birth of a planet for the first time ever. This spectacular image from the SPHERE instrument on ESO's Very Large Telescope is the first clear image of a planet caught in the very act of formation around the dwarf star PDS 70. The planet stands clearly out, visible as a bright point to the right of the center of the image, which is blacked out by the coronagraph mask used to block the blinding light of the central star. ESO/A. Müller et al Science news in pictures New human organ discovered that was previously missed by scientists Layers long thought to be dense, connective tissue are actually a series of fluid-filled compartments researchers have termed the “interstitium”. These compartments are found beneath the skin, as well as lining the gut, lungs, blood vessels and muscles, and join together to form a network supported by a mesh of strong, flexible proteins Getty Science news in pictures Previously unknown society lived in Amazon rainforest before Europeans arrived, say archaeologists Working in the Brazilian state of Mato Grosso, a team led by archaeologists at the University of Exeter unearthed hundreds of villages hidden in the depths of the rainforest. These excavations included evidence of fortifications and mysterious earthworks called geoglyphs José Iriarte Science news in pictures One in 10 people have traces of cocaine or heroin on fingerprints, study finds More than one in 10 people were found to have traces of class A drugs on their fingers by scientists developing a new fingerprint-based drug test. Using sensitive analysis of the chemical composition of sweat, researchers were able to tell the difference between those who had been directly exposed to heroin and cocaine, and those who had encountered it indirectly. Getty Science news in pictures Nasa releases stunning images of Jupiter's great red spot The storm bigger than the Earth, has been swhirling for 350 years. The image's colours have been enhanced after it was sent back to Earth. Pictures by: Tom Momary

Equally frightening is the reason for this approaching limit, which Cliff says is because “the laws of physics forbid it.”

At the core of Cliff's argument are what he calls the two most dangerous numbers in the universe. These numbers are responsible for all the matter, structure, and life that we witness across the cosmos.

And if these two numbers were even slightly different, says Cliff, the universe would be an empty, lifeless place.

World still three minutes from ‘apocalypse’ according Doomsday Clock

Dangerous No. 1: The strength of the Higgs field

The first dangerous number on Cliff's list is a value that represents the strength of what physicists call the Higgs field, an invisible energy field not entirely unlike other magnetic fields that permeates the cosmos.

As particles swim through the Higgs field, they gain mass to eventually become the protons, neutrons, and electrons comprising all of the atoms that make up you, me, and everything we see around us.

Without it, we wouldn't be here.

We know with near certainty that the Higgs field exists because of a groundbreaking discovery in 2012, when CERN physicists detected a new elementary particle called the Higgs boson. According to theory, you can't have a Higgs boson without a Higgs field.

Mass hysteria: The Large Hadron Collider in Cern, Geneva, where scientists continue to search for the Higgs boson (Getty Images)

But there's something mysterious about the Higgs field that continues to perturb physicists like Cliff.

According to Einstein's theory of general relativity and the theory of quantum mechanics — the two theories in physics that drive our understanding of the cosmos on incredibly large and extremely small scales — the Higgs field should be performing one of two tasks, says Cliff.

Either it should be turned off, meaning it would have a strength value of zero and wouldn't be working to give particles mass, or it should be turned on, and, as the theory goes, this “on value” is “absolutely enormous,” Cliff says. But neither of those two scenarios are what physicists observe.

The Higgs boson

“In reality, the Higgs field is just slightly on,” says Cliff. “It's not zero, but it's ten-thousand-trillion times weaker than it's fully on value — a bit like a light switch that got stuck just before the 'off' position. And this value is crucial. If it were a tiny bit different, then there would be no physical structure in the universe.”

Why the strength of the Higgs field is so ridiculously weak defies understanding. Physicists hope to find an answer to this question by detecting brand-new particles at the newly upgraded particle accelerator at CERN. So far, though, they're still hunting.

Dangerous No. 2: The strength of dark energy

Dark matter (Nasa/ESA/European Southern Observatory)

Cliff's second dangerous number doubles as what physicists have called “the worst theoretical prediction in the history of physics.”

This perilous number deals in the depths of deep space and a mind-meltingly complex phenomenon called dark energy.

Dark energy, a repulsive force that's responsible for the accelerating expansion of our universe, was first measured in 1998.

Still, “we don't know what dark energy is,” Cliff admits. “But the best idea is that it's the energy of empty space itself — the energy of the vacuum.”

If this is true, you should be able to sum up all the energy of empty space to get a value representing the strength of dark energy. And although theoretical physicists have done so, there's one gigantic problem with their answer:

The Large Hadron Collider at CERN which may have discovered the Higgs Boson particle in December (Reuters)

“Dark energy should be 10120 times stronger than the value we observe from astronomy,” Cliff said. “This is a number so mind-boggling huge that it's impossible to get your head around ... this number is bigger than any number in astronomy — it's a thousand-trillion-trillion-trillion times bigger than the number of atoms in the universe. That's a pretty bad prediction.”

On the bright side, we're lucky that dark energy is smaller than theorists predict. If it followed our theoretical models, then the repulsive force of dark energy would be so huge that it would literally rip our universe apart. The fundamental forces that bind atoms together would be powerless against it and nothing could ever form — galaxies, stars, planets, and life as we know it would not exist.

On the other hand, it's extremely frustrating that we can't use our current theories of the universe to develop a better measurement of dark energy that agrees with existing observations. Even better than improving our theories would be to find a way that we can understand why the strength of dark energy and the Higgs field is what it is.

Getting answers could be impossible

The multiverse is a hypothetical set of parallel universe that exist simultaneously (Getty)

Cliff said there is one possible way to get some answers, but we might never have the ability to prove it.

If we could somehow confirm that our universe is just one in a vast multiverse of billions of other universes, then “suddenly we can understand the weirdly fine-tuned values of these two dangerous numbers [because] in most of the multiverse dark energy is so strong that the universe gets torn apart, or the Higgs field is so weak that no atoms can form,” Cliff said.

To prove this, physicists need to discover new particles that would uphold radical theories like string theory, which predicts the existence of a multiverse. Right now, there's only one place in the world that could possibly produce these particles, if they exist, and that's the Large Hadron Collider at CERN.

And physicists only have two to three years before CERN shuts the LHC down for upgrades. If we haven't found anything by then, Cliff said, it could signal the beginning of the end.

“We may be entering a new era in physics. An era where there are weird features in the universe that we cannot explain. An era where we have hints that we live in a multiverse that lies frustratingly beyond our reach. An era where we will never be able to answer the question why is there something rather than nothing.”

Check out the TED talk below:

Loading....

Read more: