John G. Hartnett (born 24 March 1953 in Manjimup, Western Australia), is an Australian

young Earth creationist Young Earth creationism (YEC) is a form of creationism which holds as a central tenet that the Earth and its lifeforms were created by supernatural acts of the Abrahamic God between about 10,000 and 6,000 years ago, contradicting established ...

and

cosmologist Cosmology () is a branch of physics and metaphysics dealing with the nature of the universe, the cosmos. The term ''cosmology'' was first used in English in 1656 in Thomas Blount's ''Glossographia'', with the meaning of "a speaking of the wor ...

. He has been active with

Creation Ministries International Creation Ministries International (CMI) is a nonprofit organisation that promotes the pseudoscience of young Earth creationism. It has branches in Australia, Canada, New Zealand, Singapore, South Africa, the United Kingdom, and the United Stat ...

and is known for his opposition to the

Big Bang The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. Various cosmological models based on the Big Bang concept explain a broad range of phenomena, including th ...

theory and criticism of the

dark matter In astronomy, dark matter is an invisible and hypothetical form of matter that does not interact with light or other electromagnetic radiation. Dark matter is implied by gravity, gravitational effects that cannot be explained by general relat ...

and

dark energy In physical cosmology and astronomy, dark energy is a proposed form of energy that affects the universe on the largest scales. Its primary effect is to drive the accelerating expansion of the universe. It also slows the rate of structure format ...

hypotheses. He received both his BSc (Hons) (1973) and PhD with distinction (2001) from the School of Physics at the

University of Western Australia University of Western Australia (UWA) is a public research university in the Australian state of Western Australia. The university's main campus is in Crawley, Western Australia, Crawley, a suburb in the City of Perth local government area. UW ...

(UWA). He currently works as a Research Fellow at the

University of Adelaide The University of Adelaide is a public university, public research university based in Adelaide, South Australia. Established in 1874, it is the third-oldest university in Australia. Its main campus in the Adelaide city centre includes many Sa ...

, South Australia. He has published more than 200 papers in scientific journals, book chapters and conference proceedings, holds one patent, works on the development of ultra-stable cryocooled sapphire oscillators and participated on a Sapphire Clock Ensemble project (

Atomic Clock An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on atoms having different energy levels. Electron states in an atom are associated with different energy levels, and in transitions betwee ...

Ensemble in

Space Mission Spaceflight (or space flight) is an application of astronautics to fly objects, usually spacecraft, into or through outer space, either with or without humans on board. Most spaceflight is uncrewed and conducted mainly with spacecraft such a ...

) run by the

European Space Agency The European Space Agency (ESA) is a 23-member International organization, international organization devoted to space exploration. With its headquarters in Paris and a staff of around 2,547 people globally as of 2023, ESA was founded in 1975 ...

. He also has written articles for several creationist journals and, according to

, Hartnett "believes that God is the real creator of the universe as the Bible says."

Research interests

His research interests include ultra low-noise radar and ultra high stability

cryogenic In physics, cryogenics is the production and behaviour of materials at very low temperatures. The 13th International Institute of Refrigeration's (IIR) International Congress of Refrigeration (held in Washington, DC in 1971) endorsed a univers ...

microwave

oscillator Oscillation is the repetitive or periodic variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states. Familiar examples of oscillation include a swinging pendulum ...

s and clocks based on a pure single-crystal

sapphire Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide () with trace amounts of elements such as iron, titanium, cobalt, lead, chromium, vanadium, magnesium, boron, and silicon. The name ''sapphire ...

resonator A resonator is a device or system that exhibits resonance or resonant behavior. That is, it naturally oscillates with greater amplitude at some frequencies, called resonant frequencies, than at other frequencies. The oscillations in a reso ...

s. Applications for the latter are to provide low noise

local oscillator In electronics, the term local oscillator (LO) refers to an electronic oscillator when used in conjunction with a Frequency mixer, mixer to change the frequency of a signal. This frequency conversion process, also called Heterodyne, heterodyning ...

s to atomic physics labs, time and frequency atomic fountain standards, and very high frequency

VLBI Very-long-baseline interferometry (VLBI) is a type of astronomical interferometry used in radio astronomy. In VLBI a signal from an astronomical radio source, such as a quasar, is collected at multiple radio telescopes on Earth or in space. T ...

(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

pulsar A pulsar (''pulsating star, on the model of quasar'') is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its Poles of astronomical bodies#Magnetic poles, magnetic poles. This radiation can be obse ...

s (rotating

neutron stars A neutron star is the gravitationally collapsed core of a massive supergiant star. It results from the supernova explosion of a massive star—combined with gravitational collapse—that compresses the core past white dwarf star density to th ...

that produce highly periodic bursts of

radio wave Radio waves (formerly called Hertzian waves) are a type of electromagnetic radiation with the lowest frequencies and the longest wavelengths in the electromagnetic spectrum, typically with frequencies below 300 gigahertz (GHz) and wavelengths g ...

s; 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 A resonator is a device or system that exhibits resonance or resonant behavior. That is, it naturally oscillates with greater amplitude at some frequencies, called resonant frequencies, than at other frequencies. The oscillations in a resonat ...

, detection of WISPs using low noise microwave techniques, tests of the fundamental theories of physics, such as

special Special or specials may refer to: Policing * Specials, Ulster Special Constabulary, the Northern Ireland police force * Specials, Special Constable, an auxiliary, volunteer, or temporary; police worker or police officer * Special police forces ...

and

general relativity General relativity, also known as the general theory of relativity, and as Einstein's theory of gravity, is the differential geometry, geometric theory of gravitation published by Albert Einstein in 1915 and is the current description of grav ...

, measurement of drift in fundamental constants and their

cosmological Cosmology () is a branch of physics and metaphysics dealing with the nature of the universe, the cosmos. The term ''cosmology'' was first used in English in 1656 in Thomas Blount's ''Glossographia'', with the meaning of "a speaking of the wo ...

implications and

cosmology Cosmology () is a branch of physics and metaphysics dealing with the nature of the universe, the cosmos. The term ''cosmology'' was first used in English in 1656 in Thomas Blount's ''Glossographia'', with the meaning of "a speaking of the wo ...

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. According to Moshe Carmeli, Professor of Theoretical Physics at Ben Gurion University in Beer Sheva, Israel, Hartnett asserted in his theory that there is no need to assume the existence of

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.

References

Bibliography

* * * (46 search results for "Hartnett") * "David Kaiser is a professor...at the Massachusetts Institute of Technology... His physics research focuses on early-universe cosmology..." {{DEFAULTSORT:Hartnett, John (physicist) 1952 births Living people 20th-century Australian male writers 20th-century Australian non-fiction writers 20th-century evangelicals 21st-century Australian male writers 21st-century Australian non-fiction writers 21st-century evangelicals Academic staff of the University of Adelaide Australian evangelicals Australian male non-fiction writers Australian physicists Christian Young Earth creationists Cosmologists Evangelical writers People from Manjimup, Western Australia University of Western Australia alumni