Hoop Conjecture

Hoop Conjecture

The Hoop Conjecture, proposed by Kip Thorne in 1972, states that an imploding object forms a black hole when, and only when, a circular hoop with a specific critical circumference could be placed around the object and rotated. The critical circumference is given by 2 times Pi times the Schwarzschild radius corresponding to the object's mass.

Thorne calculated the effects of gravitation on objects of different shapes (spheres, and cylinders that are infinite in one direction), and concluded that the object needed to be compressed in all three directions before gravity led to the formation of a black hole. With cylinders, the event horizon was formed when the object could fit inside the hoop described above. The mathematics to prove the same for objects of all shapes was too difficult for him at that time, but he formulated his hypothesis as the hoop conjecture.

ee also

*General relativity

References

* Thorne, Kip, "", W. W. Norton & Company; Reprint edition, January 1, 1995. ISBN 0-393-31276-3.


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Kip Thorne — Infobox Scientist name = Kip Thorne image width = 240px caption = birth date = birth date and age|1940|6|1 birth place = Logan, Utah death date = death place = residence = nationality = field = Physics work institution = Caltech alma mater =… …   Wikipedia

  • General relativity — For a generally accessible and less technical introduction to the topic, see Introduction to general relativity. General relativity Introduction Mathematical formulation Resources …   Wikipedia

  • Contributors to general relativity — General relativity Introduction Mathematical formulation Resources Fundamental concepts …   Wikipedia

  • Mass in general relativity — General relativity Introduction Mathematical formulation Resources Fundamental concepts …   Wikipedia

  • Список известных учёных-релятивистов —   Это служебный список статей, созданный для координации работ по развитию темы.   Данное предупреждение не ус …   Википедия

  • Известные учёные-релятивисты —       Служебный список статей, созданный для координации работ по развитию темы.   Данное предупреждение не устанавл …   Википедия

  • Ron Kellogg — Ronald A. (Ron) Kellogg Jr. (born December 19 1962 in Omaha, Nebraska) is a former American college and professional basketball player, best known for his college days as a left handed sharpshooter for the successful Larry Brown coached Kansas… …   Wikipedia

  • Waitoreke — (Maori Otter, New Zealand Otter, Kaureke) Creature Grouping Cryptid Data Country New Zealand Region South Island …   Wikipedia

  • Anthropology and Archaeology — ▪ 2009 Introduction Anthropology       Among the key developments in 2008 in the field of physical anthropology was the discovery by a large interdisciplinary team of Spanish and American scientists in northern Spain of a partial mandible (lower… …   Universalium

  • Meindert Hobbema — (bapt. October 31, 1638, Amsterdam December 7, 1709, Amsterdam), was a landscape painter of the Dutch school. The Water Mill by Meindert Hobbema (1663 68) Oil on wood, 77,5 x 111 cm. Musées Royaux des Beaux Arts, Brussels …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”