On the accuracy of the ALMA flux calibration in the time domain and across spectral windows

Posted by klaurent Peking

Kavli Affiliate: Gregory Herczeg | First 5 Authors: Logan Francis, Doug Johnstone, Gregory Herczeg, Todd R. Hunter, Daniel Harsono | Summary: A diverse array of science goals require accurate flux calibration of observations with the Atacama Large Millimeter/Submillimeter array (ALMA), however, this goal remains challenging due to the stochastic time-variability of the “grid” quasars ALMA […]


Continue.. On the accuracy of the ALMA flux calibration in the time domain and across spectral windows

Robust laboratory limits on a cosmological spatial gradient in the electromagnetic fine-structure constant from accelerometer experiments

Posted by klaurent Tokyo

Kavli Affiliate: Yevgeny V. Stadnik | First 5 Authors: Yevgeny V. Stadnik, , , , | Summary: Quasar absorption spectral data indicate the presence of a spatial gradient in the electromagnetic fine-structure constant $alpha$ on cosmological length scales. We point out that experiments with accelerometers, including torsion pendula and atom interferometers, can be used as […]


Continue.. Robust laboratory limits on a cosmological spatial gradient in the electromagnetic fine-structure constant from accelerometer experiments