The Higgs Boson and Tiny Black Holes: A Cosmic Catastrophe Averted?
Although our Universe seems stable, having existed for 13.7 billion years, recent experiments suggest it may be at risk due to the instability of a fundamental particle: the Higgs boson.
In new research by my colleagues and me, just accepted for publication in Physical Letters B, we show that some models of the early Universe, involving objects called light primordial black holes, are unlikely to be correct because they would have triggered the Higgs boson to end the cosmos by now.
The Higgs boson is responsible for the mass and interactions of all known particles. Particle masses result from elementary particles interacting with the Higgs field. The existence of the Higgs boson confirms the existence of this field, which is uniform across the Universe. This uniformity allows us to observe consistent physical laws throughout the cosmos.
However, the Higgs field may not be in its lowest possible energy state. It could theoretically drop to a lower energy state in a certain location, drastically altering the laws of physics in a process known as a phase transition. This would create low-energy bubbles of space with different physical properties, where particles like electrons, protons, and neutrons would behave differently. Such a change would be catastrophic, effectively ending the Universe as we know it.
Recent measurements from the Large Hadron Collider (LHC) at CERN suggest that such an event could occur, but likely only in the distant future—thousands of billions of years from now. This is why the Universe is considered “meta-stable” rather than unstable; the end is not imminent.
For a bubble to form, the Higgs field needs sufficient energy. Due to quantum mechanics, the Higgs field’s energy is constantly fluctuating, making bubble formation statistically possible, though unlikely. However, in the presence of strong gravitational fields or hot plasma, the field could more easily form bubbles, borrowing energy from these sources.
While the early Universe was hot enough to provide energy for bubble formation, thermal effects likely stabilized the Higgs field, preventing catastrophic phase transitions. This stabilization is why we still exist today.
Our research indicates that primordial black holes, which could have formed from overly dense regions of spacetime shortly after the Big Bang, would have caused continuous bubbling in the Higgs field. These black holes, unlike those formed from star collapses, could be as light as a gram. Theoretical models suggest their existence, but they would have evaporated by now due to Hawking radiation—a process where black holes emit radiation and lose mass.
As these black holes evaporate, they would locally heat the Universe, creating hot spots much hotter than the surrounding space but still cooler than the Hawking temperature. Our calculations and simulations show that these hot spots would cause the Higgs field to bubble, but since we are still here, such black holes likely never existed. This finding rules out cosmological scenarios predicting their existence.
However, if evidence of primordial black holes is found, it could indicate unknown factors protecting the Higgs field from bubbling, possibly pointing to new particles or forces. Regardless, this research highlights the vast mysteries still to be uncovered about the Universe on both the smallest and largest scales.
Source: The Higgs Boson and Tiny Black Holes: A Cosmic Catastrophe Averted?
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