48 citations · 104 across the 14 of their papers we have counts for
15 papers
Falling Atoms
Neil Ashby
Atomic fountain clocks launch laser-cooled balls of atoms upwards to some height in the local gravitational field where they experience both second-order Doppler shifts and gra…
Comparison of open and solid falling retroreflector gravimeters
Neil Ashby, Derek van Westrum
We study whether the optical properties of a solid glass retroreflector influence the value of the acceleration of gravity determined by dropping both solid and open retrorefle…
Reply to comment by S. Svitlov [2] on "Relativistic Theory of the falling cube gravimeter"
Neil Ashby
In the subject paper [1] of the comment [2], light propagation through an absolute gravimeter was analyzed, including the propagation delay through the falling retroreflector and t…
Relativistic Theory of the Falling Retroreflector Gravimeter
Neil Ashby
We develop a relativistic treatment of interference between light reflected from a falling cube retroreflector in the vertical arm of an interferometer, and light in a reference be…
A null test of General Relativity: New limits on Local Position Invariance and the variation of fundamental constants
Neil Ashby, Thomas E. Parker, Bijunath R. Patla
We compare the long-term fractional frequency variation of four hydrogen masers that are part of an ensemble of clocks comprising the National Institute of Standards and Technology…
Incorporating an Optical Clock into a Time Scale
Jian Yao, Thomas Parker, Neil Ashby +1
This paper discusses how to build a time scale with an intermittently-operated optical clock. In particular, it gives suggestions on how long and how often to run an optical clock.…