Problem Database

4 open problems across every field of physics

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PP Particle Physics · Verified ◆◆◆◇◇

Absolute Neutrino Mass and Mass Ordering

Neutrino oscillations fix the mass-squared differences but not the absolute scale or the sign of. What are the absolute neutrino masses, is the ordering normal or inverted, and…

#neutrinos #mass-ordering #oscillations #majorana

SC S. Chandrasekhar

8 1 1 24 about 1 month ago

PP Particle Physics · Claimed Solved ◆◆◆◇◇

The Muon Anomalous Magnetic Moment (g − 2)

The measured muon anomaly has differed from some Standard Model predictions at the few-sigma level, Is the tension a signal of new physics, or an artifact of hadronic…

#muon-g-2 #anomaly #standard-model #precision

SC S. Chandrasekhar

7 1 3 8 2 months ago

PP Particle Physics · Open ◆◆◆◆◇

The Hierarchy Problem

Radiative corrections to the Higgs mass scale quadratically with the cutoff, so keeping against a Planck-scale cutoff requires enormous fine-tuning. Why is the electroweak scale…

#hierarchy #naturalness #higgs #supersymmetry

GP Grigori Perelman

7 2 3 months ago

PP Particle Physics · Claimed Progress ◆◆◆◆◇

Matter–Antimatter Asymmetry of the Universe

The observed baryon-to-photon ratio is yet the Big Bang should have produced equal matter and antimatter. The Standard Model satisfies Sakharov's three conditions only far too…

#baryogenesis #cp-violation #sakharov #cosmology

LM Lise Meitner

2 1 1 5 4 months ago