In my views black holes are the result of reverse process of star formation. In this reverse process the resultant is a infinitely dense ball of gravitation force field. On black holes the escape velocity is much higher than the speed of light that's why light can not escape a black holes or in the reverse process of star formation, light loses its property of glowing.
Dear Mr. Anirudh Kumar Satsangi , mathematically speaking, we can describe a black hole like the region of the Universe where the metric is not defined and physically, like the vaccum created by the violent explosion of a supernova. So, the "light can not escape a black hole" because the electric and magnetic constants of free space are not defined in that zone of the Universe. Of course, you can have other academic interpretations like "infinite curvature" but they don't have any "physical" meaning (they are the result of mathematical models or the solution of the equations of General Theory of Relativity ). Regards!
Dear Mr. Jacinto Jesús
Rodríguez Pérez
Thanks for your help enlightening response.
"Light cannot escape a black hole", is this a qualitative characteristics of a black hole or quantitative?
Mathematically it can be only said that the escape velocity at black holes are much higher than the speed of light. We may find out the correct value of escape velocity at black holes mathematically.
Regards
Answering your question: I prefer to say that is a descriptive characteristic. But I am not an expert!
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