A Fifth Fundamental Force Could Really Exist, But We Haven’t Found It Yet – Universe Today

The universe is governed by four fundamental forces: gravity, electromagnetism, and the strong and weak nuclear forces. These forces drive the motion and behavior of everything we see around us. At least thats what we think. But over the past several years theres been increasing evidence of a fifth fundamental force. New research hasnt discovered this fifth force, but it does show that we still dont fully understand these cosmic forces.

The fundamental forces are a part of the standard model of particle physics. This model describes all the various quantum particles we observe, such as electrons, protons, antimatter, and such. Quarks, neutrinos and the Higgs boson are all part of the model.

The term force in the model is a bit of a misnomer. In the standard model, each force is the result of a type of carrier boson. Photons are the carrier boson for electromagnetism. Gluons are the carrier bosons for the strong, and bosons known as W and Z are for the weak. Gravity isnt technically part of the standard model, but its assumed that quantum gravity has a boson known as the graviton. We still dont fully understand quantum gravity, but one idea is that gravity can be united with the standard model to produce a grand unified theory (GUT).

Every particle weve ever discovered is a part of the standard model. The behavior of these particles matches the model extremely accurately. We have looked for particles beyond the standard model, but so far we have never found any. The standard model is a triumph of scientific understanding. It is the pinnacle of quantum physics.

But weve started to learn it has some serious problems.

To begin with, we now know the standard model cant combine with gravity in the way that we thought. In the standard model, the fundamental forces unify at higher energy levels. Electromagnetism and the weak combine into the electroweak, and the electroweak unifies with the strong to become the electronuclear force. At extremely high energies the electronuclear and gravitational forces should unify. Experiments in particle physics have shown that the unification energies dont match up.

More problematic is the issue of dark matter. Dark matter was first proposed to explain why stars and gas on the outer edge of a galaxy move faster than predicted by gravity. Either our theory of gravity is somehow wrong, or there must be some invisible (dark) mass in galaxies. Over the past fifty years, the evidence for dark matter has gotten really strong. Weve observed how dark matter clusters galaxies together, how it is distributed within particular galaxies, and how it behaves. We know it doesnt interact strongly with regular matter or itself, and it makes up the majority of mass in most galaxies.

But there is no particle in the standard model that could make up dark matter. Its possible that dark matter could be made of something such as small black holes, but astronomical data doesnt really support that idea. Dark matter is most likely made of some yet undiscovered particle, one the standard model doesnt predict.

Then there is dark energy. Detailed observations of distant galaxies show that the universe is expanding at an ever-increasing rate. There seems to be some kind of energy driving this process, and we dont understand how. It could be that this acceleration is the result of the structure of space and time, a kind of cosmological constant that causes the universe to expand. It could be that this is driven by some new force yet to be discovered. Whatever dark energy is, it makes up more than two-thirds of the universe.

All of this points to the fact that the standard model is, at best, incomplete. There are things we are fundamentally missing in the way the universe works. Lots of ideas have been proposed to fix the standard model, from supersymmetry to yet undiscovered quarks, but one idea is that there is a fifth fundamental force. This force would have its own carrier boson(s) as well as new particles beyond the ones weve discovered.

This fifth force would also interact with the particles we have observed in subtle ways that contradict the standard model. This brings us to a new paper claiming to have evidence of such an interaction.

The paper looks at an anomaly in the decay of helium-4 nuclei, and it builds off an earlier study of beryllium-8 decays. Beryllium-8 has an unstable nucleus that decays into two nuclei of helium-4. In 2016 the team found that the decay of beryllium-8 seems to violate the standard model slightly. When the nuclei are in an excited state, it can emit an electron-positron pair as it decays. The number of pairs observed at larger angles is higher than the standard model predicts, and is known as the Atomki anomaly.

There are lots of possible explanations for the anomaly, including experiment error, but one explanation is that its caused by boson the team named X17. It would be the carrier boson for a (yet unknown) fifth fundamental force, with a mass of 17 MeV. In the new paper, the team found a similar discrepancy in the decay of helium-4. The X17 particle could also explain this anomaly.

While this sounds exciting, theres reason to be cautious. When you look at the details of the new paper, theres a bit of odd data tweaking. Basically, the team assumes X17 is accurate and shows that the data can be made to fit with their model. Showing that a model can explain the anomalies isnt the same as proving your model does explain the anomalies. Other explanations are possible. If X17 does exist, we should have also seen it in other particle experiments, and we havent. The evidence for this fifth force is really weak.

The fifth force could exist, but we havent found it yet. What we do know is that the standard model doesnt entirely add up, and that means some very interesting discoveries are waiting to be found.

Source: New evidence supporting the existence of the hypothetic X17 particle, by Krasznahorkay, A. J., et al.

Source: Observation of anomalous internal pair creation in be 8: A possible indication of a light, neutral boson, by Krasznahorkay, A. J., et al.

Like Loading...

See the rest here:

A Fifth Fundamental Force Could Really Exist, But We Haven't Found It Yet - Universe Today