John Hartnett

Research interests His research interests include ultra low-noise radar and ultra high stability cryogenic microwave oscillators and clocks based on a pure single-crystal sapphire resonators. Applications for the latter are to provide low noise local oscillators to atomic physics labs, time and frequency atomic fountain standards, and very high frequency VLBI (Very-Long-Baseline-Interferometry) radio-astronomy. The terrestrial clock technology co-developed by him is claimed to be the most stable in the universe, with Hartnett et al. stating that it outperformed the stability of signals generated by pulsars (rotating neutron stars that produce highly periodic bursts of radio waves; such astronomical sources are then used as natural clocks e.g. for tests of physics). Further on, he is interested in the development of cryocooled CSO resonators, detection of WISPs using low noise microwave techniques, tests of the fundamental theories of physics, such as special and general relativity, measurement of drift in fundamental constants and their cosmological implications and cosmology and the large scale structure of the universe. He is also part of a team of scientists who are building liquid helium-cooled oscillators used by sapphire clocks for the National Metrology Institute of Japan in Tsukuba, Japan. Hartnett asserted in his theory that there is no need to assume the existence of dark matter in the universe.

Publications John Hartnett is the author of the book "Starlight, Time and the New Physics" (2007). and co-author of the book "Dismantling the Big Bang".

Patents P1 "Temperature Compensated Oscillator"; US Patent Number 7,046,099, issued 16 May 2006. Obtained from US patent search.