The current best upper limit on the electron neutrino mass is 0.1 eV, as determined by the KATRIN experiment.

The current best upper limit on the muon neutrino mass is 0.1 eV, as determined by the IceCube experiment.

The current best upper limit on the tau neutrino mass is 1 eV, as determined by the OPERA experiment.

Neutrino mass contributes to the total mass-energy density of the universe, which affects the expansion rate of the universe. The more neutrino mass there is, the slower the universe expands.

Neutrino mass affects the growth of density perturbations in the early universe. The more neutrino mass there is, the more difficult it is for density perturbations to grow and form large-scale structures.

The search for neutrino mass is an active area of research, and there is currently no conclusive evidence for or against neutrino mass. Several experiments are currently underway to try to measure neutrino mass more precisely.

There are several proposed mechanisms for generating neutrino mass, including the Higgs mechanism, the seesaw mechanism, and the radiative mechanism. Each of these mechanisms has its own advantages and disadvantages, and the question of which mechanism is responsible for neutrino mass is still an open one.

Neutrino mass has a number of implications for particle physics beyond the Standard Model. It requires the existence of new particles, such as the right-handed neutrino, and it requires the modification of the Standard Model to include these new particles. Additionally, neutrino mass may provide a window into new physics at very high energies.

Neutrino mass has a number of potential applications, including probing the properties of dark matter, studying the evolution of the universe, and searching for new particles. Neutrino mass could also be used to develop new technologies, such as neutrino-based detectors and neutrino-powered spacecraft.

There are a number of challenges in measuring neutrino mass. Neutrinos are very difficult to detect, neutrino mass is very small, and neutrino oscillations make it difficult to measure neutrino mass. Despite these challenges, there are a number of experiments that are currently underway to try to measure neutrino mass more precisely.

Neutrino mass plays an important role in the formation of the early universe. Neutrino mass contributes to the total mass-energy density of the universe, which affects the expansion rate of the universe. Neutrino mass also affects the growth of density perturbations in the early universe, which eventually leads to the formation of large-scale structures such as galaxies and clusters of galaxies.

There are a number of proposed solutions to the problem of neutrino mass. The Higgs mechanism is one possible solution, which involves the existence of a new particle called the Higgs boson. The seesaw mechanism is another possible solution, which involves the existence of new heavy neutrinos. The radiative mechanism is a third possible solution, which involves the exchange of virtual particles between neutrinos and other particles.

Neutrino mass has a number of implications for cosmology. Neutrino mass affects the expansion rate of the universe, the formation of large-scale structures in the universe, and the cosmic microwave background radiation. Neutrino mass also affects the abundance of light elements in the universe.

Neutrino mass has a number of implications for astrophysics. Neutrino mass affects the evolution of stars, the formation of neutron stars and black holes, and the emission of neutrinos from supernovae. Neutrino mass also affects the properties of neutrinos themselves, such as their oscillation probabilities.