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The Universe Is Hiding an Extra Dimension, Scientists Say
Caroline Delbert · 2026-05-27 · via Latest Content - Popular Mechanics

Here’s what you’ll learn when you read this story:

  • A new math model shows how very condensed spacetime could be part of general relativity.
  • The early universe and compact neutron stars both exemplify these exotic spacetimes.
  • Exotic spacetimes show extra “effective dimensions” that can help fit them into our understanding.

We experience the universe in four dimensions: three spatial dimensions and time. But what if that number isn’t fixed? What if the cosmos has a hidden extra dimension that only reveals itself under crushing pressure or blistering heat? A new study from Istanbul University proposes exactly that, and offers a mathematical framework to describe it.

The question matters because of the Big Bang. Cosmology’s biggest unsolved puzzle is what happened in the universe’s earliest moments, when all matter and energy were compressed into conditions so extreme that our standard physics crumble. It was only after the Big Bang that time and matter as we know them came into existence. Scientists seek analogies to those primordial conditions, such as extremely dense objects like black holes or neutron stars, so they can test their theories in at least an approximate way.

What connects all these exotic environments is a strange theoretical prediction: at very short distances or very high energies, spacetime may stop behaving as though it has exactly four dimensions. Scientists Lina Yıldız, Deha Kaykı, and Ertan Güdekli began their work, which appears now in European Physical Journal C, from the idea that different parts of our universe may appear to have more than the expected four “effective” dimensions precisely because of the extreme curvatures present in these regions. The researchers say that different parts of our universe may appear to us as having more than the expected “effective” four dimensions of length, width, depth, and time because of the “short distances or high energies” of these areas. They cite work going back to 2005 for this principle. Any areas showing strange dimensionality like this are edge cases of general relativity that must be interpreted into our existing body of physics knowledge.

So how do you build a theory that lets dimensions shift without wrecking everything else we know? The researchers’ answer draws on fractal geometry and a quantity called the Ricci scalar, which measures curvature in spacetime and how some pockets are different from the “flat space” around them. Using these tools, they constructed a new mathematical model in which the effective number of dimensions responds dynamically to local curvature. With a math expression in hand, the scientists and their peers can swap in and test this expression against other theories to see if the results make sense. And vitally, for areas that are less curved, the expression moves toward zero, meaning its results won’t clash with more well understood portions of physics.

This work shows that “high-curvature environments such as compact objects or the early Universe” can be understood using math that all extends from general relativity, rather than requiring us to add “an independent matter degree of freedom” with more parameters that must be accounted for. The model specifically highlights exotic scenarios without getting messy in the everyday universe we already understand well.

The math model also fits into the paradigm called scalar-tensor theory, or scalar-tensor model, without needing special additional math in order to play nicely. For now, the scientists concluded, their model has only been applied to the set of math where special curvatures “can be treated perturbatively,” or included in the field they’ve defined here as an addition to the usual four effective dimensions.

That’s a limited usage, but laying out both new terms and their domains gives other scientists a starting point. Cosmology requires a full Swiss Army knife of tools that you can swap and try in different scenarios without having to pick up a separate toolbox or Leatherman. Whoever wants to use the tiny scissors, in the spacetime curvature sense, will get to figure out how to make them.

So are there hidden dimensions lurking in our universe? According to this model, the answer is effectively yes, but only where spacetime curves hard enough to reveal them. In the gentle, flat space of everyday life, four dimensions are all you get. It's only at the extremes—the Big Bang, a black hole's core—that the universe appears to unfold extra room. The mystery isn't fully solved, but now there's a clean mathematical tool to keep prying it open.

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➡ Archaeologists Found a Skeleton Wearing a Silver Amulet. The Discovery Is Rewriting the History of Christianity.

➡ The Stray Dogs of Chernobyl Are Rapidly Mutating. Scientists Are Still Trying to Figure Out What It Means.

➡ New Evidence Could Upend What We Know About the Charles Lindbergh Baby Murder

Police Found Mysterious Notes in a Dead Man's Pocket. They Turned Out to Be Codes That Not Even the FBI Can Break.

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Your Consciousness Can Predict the Future, Some Scientists Say

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October / November 2025

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➡ Inside the Secret Island Where Death Is Optional

➡ A Legendary Ship Sank Without Warning. Fifty Years Later, Science Could Finally Solve the Mystery of the Edmund Fitzgerald.

➡ This Tech Rebel Threw Away $900 Million in a Municipal Dump. Can Robots Find His Lost Fortune?

➡ Sex Workers, LSD, and Mind Control: What Happened in the CIA's Lab of Nightmares at 225 Chestnut Street

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The Worst Air Disaster in American History Happened in Broad Daylight. Will More Mistakes Keep Happening?

➡ NASA Has a Plan to Save Earth from Planet-Destroying Asteroids. It Sounds Even Wilder than Science Fiction.

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➡ When You Die, a Psychedelic Molecule Shapes Your Final Moments of Consciousness, a New Theory Reveals.

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This Undersea Explorer Found America's Greatest Sunken Treasure. Then Things Got Really Weird.

➡ Is Bigfoot Hiding in the Swamps of Florida? This Group Says It Has Proof.

➡ Scientists May Have Gotten the Global-Warming Timeline Seriously Wrong.

➡ A Third State Now Exists Between Life and Death, Some Scientists Now Believe

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Scientists Successfully Revive a Dead Brain, Redefining the Boundary Between Life and Death

➡ Fingerprints Keep Leading to Wrongful Convictions. Why Do Courts Still Rely on Them?

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This Guy Says He Knows the Truth About UFOs. Should We Believe Him?

➡ Scientists Are Now One Step Away From Solving Nuclear Fusion—And Unlocking Unlimited Energy.

➡ A Million-Dollar Heist Rocked the Art World— Then Amateur Sleuths Cracked the Case

➡ A New Era of Missile Warfare Has Begun—and the U.S. Isn’t Ready

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➡ A Clue Hidden in a 400-Year-Old Map Might Have Just Solved One of America's Greatest Mysteries

➡ Inside the Deranged Plot to Smuggle Cocaine With an Armed Soviet-Era Submarine

➡ This Brilliant Engineer Helped Build the B2 Bomber—Then He Sold America's Stealth Secrets to China

➡ Your Consciousness Can Connect With the Whole Universe

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➡Untold Secrets Reveal How the Castle Bravo Test Became America’s Worst Nuclear Disaster

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➡ The Sidewinder Missile Ruled the Air—Then the Soviets Stole the Design

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➡This Man Knows the Truth About Amelia Earhart. Why Doesn't Anyone Believe Him?

➡ The Army's Machine Gun Is No Match for Cheap Chinese Body Armor. So It's Making a New One.

➡ Russia Built a Stunning Rival to the Supersonic Concorde—and Then It Fell From the Sky

➡ A Navy Admiral Says Underwater UFOs Are a Threat—and the Pentagon is Withholding Secrets

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➡4 Black Eggs Have Surfaced From the Depths of the Ocean— and the Mysterious Creatures Inside Are Baffling Science

➡ A $2 Million Treasure Appeared in a Kentucky Cornfield. No One Knows Where It Came From.

➡ A Million-Dollar Heist Rocked the Art World— Then Amateur Sleuths Cracked the Case

➡ A New Era of Missile Warfare Has Begun—and the U.S. Isn’t Ready

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➡The Man Who Knows Too Much About Area 51

➡ How the FBI Took Down the Internet's Most Dangerous Website

➡ A Staggering New Clue Emerges in the D.B. Cooper Hijacking Mystery

➡ The Wildest Prison Break in U.S. History

➡ The Secret to a Perfect Lawn Lies in One of These 10 Electric Lawnmowers

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➡The Incredible Mystery of NASA’s Missing Moondust

➡ Inside the Final Fiery Minutes of the East Palestine Train Wreck

➡ Scientists Believe They’ve Unlocked Consciousness—and It Connects to the Entire Universe

➡ Why This Unstoppable Stealth Bomber Will Rule the Skies

➡ America Is Developing a New Nuclear Bomb—But Can’t Test Whether It Works

➡ The 8 Best, Expert-Recommended Solar-Powered Generators

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Special Issue: Nukes

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How Deadly Nuclear Waste Is Menacing This St. Louis Neighborhood

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A New Clue In Amelia Earhart's Disappearance Emerges From the Ocean

How an Alleged Water Bandit Stole $25 Million in Water from Thirsty California Farms

A Coal Mine Exploded and 300 Miners Died. What Went Wrong?

China Just Built a Terrifying New Aircraft Carrier and May Soon Dominate the Seas

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How Rats Took Over Our Cities—And Why We Can't Stop Them

This Language Is on the Verge of Extinction. Can It Be Saved?

➡ America's Deadliest Warplane Returns in a New Doomsday Role

This Amateur Diving Group Kept Solving Cold Cases. Then Its Own Skeletons Surfaced.

The Scientific Breakthrough That Could Put an End to Gray Hair.

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Immortality Is in Reach. But It’s Not What We Imagined.

Your Next iPhone (and Nuclear Subs) Will Be Powered By Space Metal

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China and Russia Have Cracked the Stealth Code. Can the U.S. Regain Air Dominance?

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The CIA’s Secret Plan to Build a Laser Beam Powered by the Human Mind

The 747 Ruled the Skies—Then One Slammed Into a Mountain

➡The Race to Contain AI Before Singularity

These Florida Homes Aren’t Just Hurricane-Proof—They’re Blueprints for the Future

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AI Is on the Cusp of Taking Control—This Is How It May All Go Wrong

There’s No Weapon Russia Fears More Than the HIMARS Rocket Launcher

➡The Nuclear-Submarine Arms Race Is Getting Intense, and the U.S. Just Took a Massive Leap Forward

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The Greatest Treasure Hunt in American History Ended—and Then Things Got Weird

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➡ Is Death Real?

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➡ The Navy’s New $13 Billion Aircraft Carrier Is Already Obsolete. This Weapon Can Save It.

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Can America's M1 Abrams Still Compete With China's and Russia's Latest Battle Tanks?

Inside the Final Minutes of the Concorde Disaster—and How It Doomed Supersonic Travel for Decades

How the Massive Cargo Ship Felicity Ace Sank, Taking $400 Million Worth of Exotic Supercars With It

I Turned My Old Gas-Guzzler Into a Zippy EV for $15,000

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Cosmic Secrets of the 17 Most Powerful Mega-Telescopes on Earth—and Beyond

Can the Air Force's Secret, Hypersonic Jet Reclaim the Skies From Russia and China?

For 50 Years, the Zodiac Killer's 340 Cipher Stumped the FBI—Then Three Amateurs Cracked the Code

America's Most Fearsome Howitzer Has Entered the War in Ukraine

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➡ Every Single Drone Fighting in the Skies Over Ukraine

How to Buy a New Car in 2022 Without Getting Fleeced

This Megastructure Could Keep Us Alive Forever

➡ The Race to Revolutionize EV Batteries

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Caroline Delbert is a writer, avid reader, and contributing editor at Pop Mech. She's also an enthusiast of just about everything. Her favorite topics include nuclear energy, cosmology, math of everyday things, and the philosophy of it all.