Fontem paginae Radius Schwarzschildianus inspicere

[[Fasciculus:Radius Schwarzschildianus.svg|thumb|upright=1|Radius Schwarzschildianus.]]
[[Fasciculus:Black hole optics.png|thumb|upright=1|"Umbra foraminis nigri" (regio aterrima{{dubsig}} in hac imagine) radium habet circa dupli radii Schwarzschildiani.]]

'''Radius Schwarzschildianus''' est parametrum [[physica|physicum]] quod in {{Creanda|en|Schwarzschild metric|d|Q742969|metrica Schwarzschildiana}} [[radius|radium]] [[horizon eventuum|horizontis eventuum]] [[foramen nigrum|foraminis nigri]] indicat. Cuique [[massa]]e est suus peculiaris radius Schwarzschildianus (exempli gratia, radius Schwarzschildianus [[Tellus|Telluris]] est 0.887 [[metrum|cm]]), et quaeque massa intra [[sphaera]]m sui radii Schwarzschildiani compressa foramen nigrum appellatur.

Nomen radii Schwarzschildiani in honorem [[astronomus|astronomi]] {{Creanda|en|Karl Schwarzschild|de|Karl Schwarzschild|d|Q57145|Carolus Schwarzschild|Caroli Schwarzschild}} electum est, qui [[solutio aequationis|solutionem]] exactam theoriae [[relativitas generalis|relativitatis generalis]] ad casum foraminum nigrorum non [[rotatio|rotantium]] attinentem computavit.

Radius Schwarzschildianus per sequentem [[aequatio]]nem definitur,

:<math>r_\text{s} = \frac{2 G M}{c^2}</math>

ubi {{mvar/G}} est [[constans gravitatis]], {{mvar|M|nota=𝘔 est massa corporis}} est [[massa]] corporis, et {{mvar/c}} est [[celeritas lucis]].<ref>{{cite book
	| last = Kutner
	| first = Marcus
	| title = Astronomy: A Physical Perspective
	| publisher = [[Cambridge University Press]]
	| year = [[2003]]
	| page = [https://archive.org/details/astronomyphysica00kutn/page/148 148]
	| url = https://archive.org/details/astronomyphysica00kutn
	| url-access = registration
	| isbn = 9780521529273
}}</ref><ref>{{Cite book
	| last = Guidry
	| first = Michael
	| url = https://books.google.com/books?id=6HWIDwAAQBAJ
	| title = Modern General Relativity: Black Holes, Gravitational Waves, and Cosmology
	| date = [[3 Ianuarii]] [[2003]]
	| publisher = Cambridge University Press
	| isbn = 978-1-107-19789-3
	| pages = 92
	| language = en
}}</ref>

Tamquam formula ostendit, sic cum massa crescat [[densitas]] foraminis nigri decrescit, ergo omni densitati ({{mvar|ρ|nota=𝜚 est densitas}}) est suus peculiaris radius Schwarzschildianus:

:<math>r_\text{s} = \sqrt{\frac{3 c^{2}}{8 \pi G \rho}}</math>

Exempli gratia, densitas [[aqua]]e est 1000 [[chiliogramma|kg]]/[[metrum|m]]<sup>3</sup>, ergo maxima sphaera aquea quae non fit foramen nigrum radium habet {{Num|400920754}} [[chiliometrum|km]] (circa 2.67 [[Unitas astronomica|UA]]). Cum densitas [[universum|universi]] aestimetur 8.5 × 10<sup>−27</sup> [[chiliogramma|kg]]/[[metrum|m]]<sup>3</sup>, maximus radius qui foramen nigrum non gignit est circa {{Num|14545269281}} [[annus luce mensus|annorum luce mensorum]], qui etiam est fere radius universi observabilis.<ref>{{cite web
	| url = https://www.discovermagazine.com/the-sciences/the-universe-is-not-a-black-hole
	| title = The Universe is Not a Black Hole
	| last = Carroll
	| first = Ioannes
	| date = [[28 Aprilis]] [[2010]]
	| website = Discover Magazine
	| access-date = [[25 Octobris]] [[2023]]
}}</ref>

== Notae ==
<references />

{{NexInt}}
* [[Ergosphaera]]
* [[Foramen nigrum revolvens]]
* [[Sagittarius A*]]
* [[Stella degener]]

[[Categoria:Astronomia]]
[[Categoria:Foramina nigra]]
[[Categoria:Notiones in physica]]
[[Categoria:Physica]]
{{Myrias|Physica}}