In the book “Black Holes and the Universe” (Cambridge University Press, 1990) by Igor Novikov the author represents scientific explanations for Black Holes’ existence, describes methods that would help to locate and identify a black hole in the space. I. Novikov provides an obvious correlation between quasars’ and giant black holes’ formation. The author refers to the famous Hawking theory, which stresses the fact that a black hole slowly evaporates and therefore can cease its existence. (cf. pages 51-74.)
The author claims that stars’ matter can exist in a stable equilibrium whenever the two opposing forces are equaled: gravity (attracts matter towards the center) and gasses’ pressure (makes star’s matter being expanded outwards the centre). I. Novikov introduces two critical values for a star’s mass from which its balance is scarcely possible. He states that stars which are at least 1.2 times solar mass can evolve into a neutron star, while the others, which have more than two solar masses, are able to give birth to a black hole. The author concludes that stars’ critical mass values help to predict and estimate probabilities of black holes’, neutron stars’ and white dwarfs’ formation.
I. Novikov emphasizes that black holes usually cannot be detected. He describes a method, which is used to define black holes’ locations. The author tells that it would be very reasonable to look for black holes’ candidates among binary stars. I. Novikov discusses how to determine a mass ratio in case of binary stars and then he reveals the crucial fact that black holes do not radiate in general terms. The author concludes that applications of the ideas helped to clarify the nature of Cygnus X-1, the star, which is considered to be a black hole.
I. Novikov represents the concept, which just goes beyond our imagination. The brightest objects in the space, quasars have giant black holes in their centers. The author mentions the center of our galaxy, where quasars are supposed to be located.
The author considers a revolutionary idea, which gist is black holes’ evaporation. He states that black holes’ strong magnetic fields help to produce particles of specific nature. The author says that the particles can leave for the space, taking a portion of a black hole’s mass with them.
Adopted from: Novikov, I (Cambridge University Press, 1990), Black Holes and the Universe, (pages 51-74.)
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2 comments:
The Howking's theory which claims evaporating blackhole can be stopped, in this point I war hard to understand as I told you. Besides, the point that you mentioned binal star I want to listen more what you want to talk because it was very short moment to discuss and catch yout point. Thanks.
Your book is written in very scientific style. I see that you are eager to read it, and I would not be surprise if you've already read it.
Moreover, I noticed that every author's point of view supports by sifficient evedences or theory.
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