Particle number fluctuations in a non-ideal pion gas

1 Time - Resolved Measurements of Thermodynamic Fluctuations of the Particle Number in a Dilute Fermi Gas

We report on time-resolved measurements of thermodynamic fluctuations in the number of particles in a dilute Fermi gas. The gas is comprised of thermal quasiparticles, confined in a superconducting Al box by large-gap Ta leads. The average number of quasiparticles is about 10 5. This number fluctuates due to the quasiparticle generation and recombination processes. The number is measured from t...

Time-resolved measurements of thermodynamic fluctuations of the particle number in a nondegenerate Fermi gas.

We report on time-resolved measurements of thermodynamic fluctuations in the number of particles in a nondegenerate Fermi gas. The gas is comprised of thermal quasiparticles, confined in a superconducting Al box by large-gap Ta leads. The average number of quasiparticles is about 10(5). This number fluctuates due to quasiparticle generation and recombination. The number is measured from the tun...

Particle number fluctuations in a cloven trapped Bose gas at finite temperature

Condensate fluctuations of a trapped, ideal Bose gas.

For a non-self-interacting Bose gas with a fixed, large number of particles confined to a trap, as the ground-state occupation becomes macroscopic, the condensate number fluctuations remain microscopic. However, this is the only significant aspect in which the grand canonical description differs from canonical or microcanonical in the thermodynamic limit. General arguments and estimates includi...

Observations of density fluctuations in an elongated Bose gas: ideal gas and quasicondensate regimes.

We report in situ measurements of density fluctuations in a quasi-one-dimensional 87Rb Bose gas at thermal equilibrium in an elongated harmonic trap. We observe an excess of fluctuations compared to the shot-noise level expected for uncorrelated atoms. At low atomic density, the measured excess is in good agreement with the expected "bunching" for an ideal Bose gas. At high density, the measure...