查看“︁布蘭德福–日納傑過程”︁的源代码

'''布蘭福德–日納傑過程'''（{{lang-en|'''Blandford–Znajek process'''}}），是從[[旋轉黑洞]]中提取能量的一種機制<ref>{{Citation |last1=Frolov |first1=Valeri P. |last2=Zelnikov |first2=Andrei |title=Introduction to Black Hole Physics |publisher=Oxford University Press |year=2011 |location=Oxford |url=http://books.google.com/books?id=r_l5AK9DdXsC&lpg=PA34 |isbn=978-0-19-969229-3 |zbl=1234.83001 |accessdate=2013-06-30 |archive-date=2013-06-20 |archive-url=https://web.archive.org/web/20130620062634/http://books.google.com/books?id=r_l5AK9DdXsC&lpg=PA34 |dead-url=no }}, (Chapter 8.9: Black Holes in External Magnetic Field)</ref>，由[[罗杰·布兰福德]]和[[羅馬·日納傑]]于1977年提出<ref>R. D. Blandford and R. L. Znajek, "Electromagnetic extraction of energy from Kerr black holes", [http://adsabs.harvard.edu/abs/1977MNRAS.179..433B Mon. Not. R. Astr. Soc. 179:433-456 (1977)] {{Wayback|url=http://adsabs.harvard.edu/abs/1977MNRAS.179..433B |date=20170402000829 }}</ref>。這是[[類星體]]能量來源的最佳解釋之一<ref>{{Cite web |url=http://everything2.com/title/Blandford%2520Znajek%2520process |title=存档副本 |accessdate=2013-06-30 |archive-date=2012-11-05 |archive-url=https://web.archive.org/web/20121105061837/http://everything2.com/title/Blandford%20Znajek%20process |dead-url=no }}</ref>，它需要圍繞著旋轉黑洞的[[吸積盤]]和強大的极向磁場。磁場提取自旋能，其功率可利用光速圓柱处的能量密度乘上面积得到：

: <math> P=B^2\left(\frac{r}{r_c}\right)^4 r_c c=\frac{B^2 r^4 \omega^2}{c}</math>

式中的<math>B</math>是磁場強度，<math>r_c</math>是光速半徑，<math>\omega</math>是角速度<ref>Relativistic Astrophysics and Cosmology Lecture Notes, A. Lasenby, Cambridge University, 2010-2011.</ref>。

== 參考資料 ==
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[[Category:黑洞]]
[[Category:類星體|*]]