Scientists continue to revisit theories built decades ago to explain forces that we still do not fully understand — like dark matter and dark energy. These ideas have become the foundation for how we study the universe and its expansion. Even though they can’t be seen directly, scientists still rely on these ideas to explain much of what we observe. But a new experiment might be the first step toward finding actual evidence — and it’s pushing back on some of the usual ways physics has been tested.
How the dark matter implies in the universe?
Astrophysicist Fritz Zwicky introduced the idea of dark matter in 1933 while studying the Coma Cluster. He noticed that the galaxies were moving in ways that didn’t make sense based on the visible matter alone, suggesting something unseen was holding them together.
Zwicky suggested there had to be a kind of “cosmic glue” holding everything in place — something we couldn’t see, but that added extra gravity. A few years earlier, in 1929, Edwin Hubble had shown that the universe was expanding. So if something invisible was holding galaxies together, what was pushing them apart?
In 1998, after studying distant supernovas, a team led by astrophysicist Michael Sutter proposed another unseen force — now called dark energy — to explain the acceleration of that expansion. Neither of these theories has been proven, but they remain some of the best explanations we have for how the universe works.
Unusual energy patterns identified by scientists at CERN
Now, for the first time, scientists working with the Compact Muon Solenoid (CMS) detector at CERN’s Large Hadron Collider (LHC) in Geneva have tried a new way to look for what’s being called “New Physics” — evidence of phenomena that go beyond the Standard Model.
Their focus is on something called “soft unclustered energy patterns.” These are faint energy signals that don’t group into the usual particle clusters, and some newer theories predict they could be the result of unknown particles.
Daniel Whiteson, a physicist at the University of California, Irvine, who didn’t take part in the study, explained that these soft energy patterns don’t point to just one new particle. Instead, they match predictions from a range of theories — particularly those where unknown particles interact with each other, but not with the ones scientists have already identified.
One idea is that these patterns could come from what scientists call the “Hidden Valley” — a hypothetical realm of particles that exists alongside the visible universe but barely interacts with it. This dark sector might help explain things like dark matter, which seems to make up much of the universe but can’t be seen directly.
What is the Hidden Valley?
The Standard Model is still the leading theory for explaining how particles like electrons, quarks, and neutrinos behave and interact. It focuses on three main forces — electromagnetic, weak, and strong — and has been backed by decades of testing in labs and particle accelerators. But there are still big gaps.
The Standard Model doesn’t explain dark matter, dark energy, or even gravity in the universe — the fourth fundamental force. Gravity is explained through Einstein’s general theory of relativity, which focuses on how mass affects the shape of space and time. But since it operates differently from the other fundamental forces, gravity hasn’t been successfully added to the Standard Model.
These missing pieces have led to new theories like supersymmetry (which suggests every known particle has a hidden partner), extra dimensions, and string theory. Many of these ideas include the possibility of a Hidden Valley — a group of unknown particles that mostly interact with each other, but not with the ones we observe in everyday matter.