Physicists working with the Compact Muon Sponsol_fix (CMS) experiment at the Large Hadron Collider have ruled out the existence of certain quantum black holes, using a supervised methodology to establish concrete limits on theoretical physics beyond the Standard Model, according to a study published in Progress in High Energy Physics.
LHC Extends Search for Microscopic Black Holes
Researchers at UC Santa Barbara and the Incandela Lab have broadened the scope of searches for microscopic black holes, according to findings detailed in Progress in High Energy Physics. The investigation stems from a decades-old hypothesis suggesting that given sufficient energy and potential extra spatial dimensions—a concept integral to string theory—proton-proton collisions at the Large Hadron Collider could momentarily generate quantum black holes. Although these black holes would decay almost instantly, physicists theorized their decay patterns could be detectable.
“If you want to describe things that are small, you go to quantum field theory,” Tamas Vami, a researcher involved in the study, explained in a statement. “We have the Standard Model to describe all the particles, and it performs exceptionally well in practice. And when you go to the very, very big you have general relativity that would describe how big and massive objects behave.”
Did you know? The Planck scale represents a fundamental energy level significantly higher than the energies currently observable within the universe. Theorists posit that new physics detectable at the LHC could bridge this gap between quantum physics and general relativity.
Exclusion Limits Offer Real Scientific Knowledge
Using a new technique to scour data collected by the CMS detector up to energies of 12 Tera-electron volts (TeV), researchers failed to find evidence of quantum black holes or hidden dimensions. However, according to Incandela Lab researcher Danyi Zhang, the absence of a detection does not mean the experiment failed.
“It’s not a dead-end,” Zhang explained in a statement. “The result is an exclusion limit, which is a real, publishable statement: ‘If this thing existed with these properties, we’d have seen it. We didn’t, so we can rule it out here.’ That’s genuine knowledge about how the universe works.”
This transparency helps validate findings and understand the limits of the search.
Unifying Fundamental Forces and Future Physics
The discovery of quantum black holes could help solve mysteries surrounding spacetime and assist researchers in developing a theory of quantum gravity that unites general relativity and quantum physics. According to Tamas Vami, finding evidence would allow researchers to directly study quantum gravity as a step toward unifying all known fundamental forces.
The current search clears out part of the range where new physics could be hiding, shrinking the map over time, according to Zhang.
Frequently Asked Questions
What is a quantum black hole?
Unlike classic astrophysical black holes formed by collapsing massive stars, a quantum black hole is a theoretical microscopic object that would require energy to be compressed into a tiny volume, potentially via extra hidden dimensions.
Did the Large Hadron Collider discover quantum black holes?
Why are scientists searching for quantum black holes?
Finding quantum black holes could help researchers develop a theory of quantum gravity, uniting general relativity and quantum mechanics to bridge a century-old gap in physics.
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