Øyvind Grøn
Encyclopedia
Øyvind Grøn is a Norwegian physicist.
He was born in Oslo
, and is a twin
. He took the cand.real. degree at the University of Oslo
in 1973, majoring in meteorology
. He followed up with the dr.philos. degree in 1990 with a thesis on repulsive gravitation. He started his academic career as a research assistant
at the University of Oslo, and has also been a lecturer there. He was appointed as a professor at Oslo University College
in 1994, having been an associate professor since 1985. He has also been professor II at the University of Oslo since 1994.
He has been a member of the editorial board of the European Journal of Physics
. He is also known for his popular
contributions, through the Norwegian Broadcasting Corporation, in popular articles and lectures, in books as well as the encyclopedias Store norske leksikon
and Norsk biografisk leksikon
.
, the physics in a rotating reference system (Ehrenfest paradox
) and repulsive gravitation associated with vacuum energy. Together with Erik Eriksen at the University of Oslo he has also studied properties of the electromagnetic field produced by accelerated electric charges. They have in particular shown how gravitation impacts such fields. Grøn has also found new solutions to equations in Einstein's theory of gravity that describe time space where one can travel backwards in time. In several studies Grøn has focused on relativistic models of the universe. He has, among other things, shown that it is possible to interpret observations from cosmos so that the concept of dark energy is unnecessary. The relationship between gravitation and time and between gravitation and entropy are also themes where Grøn has contributed several journal articles. He has also contributed to the Kaluza-Klein theory that represents a geometric and unified theory of electromagnetism and gravitation. According to this theory the world is five dimensional with a compact spatial dimension so small that it is not observable directly. He has shown that the electric field around a charged particle is the projection of the relativistic inertial dragging field caused by the particle's movement around the fifth dimension in our four dimensional spacetime. Grøn has written three books on the theory of relativity.
He was born in Oslo
Oslo
Oslo is a municipality, as well as the capital and most populous city in Norway. As a municipality , it was established on 1 January 1838. Founded around 1048 by King Harald III of Norway, the city was largely destroyed by fire in 1624. The city was moved under the reign of Denmark–Norway's King...
, and is a twin
Twin
A twin is one of two offspring produced in the same pregnancy. Twins can either be monozygotic , meaning that they develop from one zygote that splits and forms two embryos, or dizygotic because they develop from two separate eggs that are fertilized by two separate sperm.In contrast, a fetus...
. He took the cand.real. degree at the University of Oslo
University of Oslo
The University of Oslo , formerly The Royal Frederick University , is the oldest and largest university in Norway, situated in the Norwegian capital of Oslo. The university was founded in 1811 and was modelled after the recently established University of Berlin...
in 1973, majoring in meteorology
Meteorology
Meteorology is the interdisciplinary scientific study of the atmosphere. Studies in the field stretch back millennia, though significant progress in meteorology did not occur until the 18th century. The 19th century saw breakthroughs occur after observing networks developed across several countries...
. He followed up with the dr.philos. degree in 1990 with a thesis on repulsive gravitation. He started his academic career as a research assistant
Research assistant
A research assistant is a researcher employed, often on a temporary contract, by a university or a research institute, for the purpose of assisting in academic research...
at the University of Oslo, and has also been a lecturer there. He was appointed as a professor at Oslo University College
Oslo University College
Oslo University College , Norwegian: Høgskolen i Oslo is the largest state university college in Norway, with more than 11,000 students and approx. 1100 employees...
in 1994, having been an associate professor since 1985. He has also been professor II at the University of Oslo since 1994.
He has been a member of the editorial board of the European Journal of Physics
European Journal of Physics
The European Journal of Physics is an international peer-reviewed, scientific journal dedicated to maintaining and improving the standard of physics education in higher education...
. He is also known for his popular
Popular science
Popular science, sometimes called literature of science, is interpretation of science intended for a general audience. While science journalism focuses on recent scientific developments, popular science is broad-ranging, often written by scientists as well as journalists, and is presented in many...
contributions, through the Norwegian Broadcasting Corporation, in popular articles and lectures, in books as well as the encyclopedias Store norske leksikon
Store norske leksikon
Store norske leksikon, abbreviated SNL, is currently the second most comprehensive contemporary Norwegian language encyclopedia. The SNL was created in 1978 when the two publishing houses Aschehoug and Gyldendal merged their encyclopedias and created the company Kunnskapsforlaget. The name...
and Norsk biografisk leksikon
Norsk biografisk leksikon
Norsk biografisk leksikon is the largest Norwegian biographical encyclopedia.The first edition was issued between 1921 and 1983, including 19 volumes and 5,100 articles...
.
Scientific profile
Grøn has conducted research within the areas of general relativity, cosmology and classical electromagnetism. He has thrown new light on themes like the twin paradoxTwin paradox
In physics, the twin paradox is a thought experiment in special relativity, in which a twin makes a journey into space in a high-speed rocket and returns home to find he has aged less than his identical twin who stayed on Earth...
, the physics in a rotating reference system (Ehrenfest paradox
Ehrenfest paradox
The Ehrenfest paradox concerns the rotation of a "rigid" disc in the theory of relativity.In its original formulation as presented by Paul Ehrenfest 1909 in the Physikalische Zeitschrift, it discusses an ideally rigid cylinder that is made to rotate about its axis of symmetry...
) and repulsive gravitation associated with vacuum energy. Together with Erik Eriksen at the University of Oslo he has also studied properties of the electromagnetic field produced by accelerated electric charges. They have in particular shown how gravitation impacts such fields. Grøn has also found new solutions to equations in Einstein's theory of gravity that describe time space where one can travel backwards in time. In several studies Grøn has focused on relativistic models of the universe. He has, among other things, shown that it is possible to interpret observations from cosmos so that the concept of dark energy is unnecessary. The relationship between gravitation and time and between gravitation and entropy are also themes where Grøn has contributed several journal articles. He has also contributed to the Kaluza-Klein theory that represents a geometric and unified theory of electromagnetism and gravitation. According to this theory the world is five dimensional with a compact spatial dimension so small that it is not observable directly. He has shown that the electric field around a charged particle is the projection of the relativistic inertial dragging field caused by the particle's movement around the fifth dimension in our four dimensional spacetime. Grøn has written three books on the theory of relativity.