Definitions
Wiktionary
- n. physics Anything having eight poles or electrodes, but especially a combination of two quadrupoles used for controlling beams of charged particles
Examples
“The reported anomalies the team examined are many – two prominent cold spots, strength of the quadrupole, lack of large angular scale CMB power, alignment of the quadrupole and octupole components, hemispherical or dipole power asymmetry, to name but a handful – but the reasons for the apparent anomalies are few.”
Seven-Year WMAP Results: No, They're NOT Anomalies | Universe Today
“Nevertheless, the supermode idea is still constrained — the dipole cancels, but there are higher-order effects (quadrupole and octupole) that are observable.”
Superhorizon Perturbations and the Cosmic Microwave Background
“We show that an adiabatic superhorizon perturbation in a LCDM universe does not generate a CMB temperature dipole, and we derive constraints to the amplitude and wavelength of a superhorizon potential perturbation from measurements of the CMB quadrupole and octupole.”
Superhorizon Perturbations and the Cosmic Microwave Background
“In particular, the octupole moment (l = 3) is now in much better agreement than it used to be.”
“2S1 / 2-2F7 / 2 electric octupole transition in a single 171Yb+ ion, Phys.”
“But we still need to develop a narrower probe laser to drive the octupole clock transition more efficiently and without perturbing the ion's spectrum too much.”
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