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In the book “Black Holes and Time Warps” by Kip Thorne it is mentioned on pg 121 that Einstein didn’t believe that black holes existed so the thinking that black holes can exist didn’t come directly from his writing, thoughts, or how he interpreted his relativity theories. Because Einstein cast doubts on black holes, it seems valid to question or understand why some scientists agree they exist. In the related thread below, most posters discussed whether black holes could exist largely based on formulas. Unfortunately different scientists use different formulas. In this thread I'd like to discuss this question based on rational thinking of basic physics concepts.
Question
Can gravity be so strong that light slows down to nothing or even a negative speed? I thought the general limitations in Relativity were than gravity can become so strong that light slows down to almost nothing but not quite? Aren’t gravity and light speed inversely related, the stronger the gravitational pull, the slower light speed will be in trying to escape the gravitation pull, till the point where gravity is almost infinitely strong and light speed is almost infinitely small?
Related thread
Black holes and whether General Relativity views light as a ballistic particle?
https://www.physicsforums.com/showthread.php?t=268585
In the book “Black Holes and Time Warps” by Kip Thorne it is mentioned on pg 121 that Einstein didn’t believe that black holes existed so the thinking that black holes can exist didn’t come directly from his writing, thoughts, or how he interpreted his relativity theories. Because Einstein cast doubts on black holes, it seems valid to question or understand why some scientists agree they exist. In the related thread below, most posters discussed whether black holes could exist largely based on formulas. Unfortunately different scientists use different formulas. In this thread I'd like to discuss this question based on rational thinking of basic physics concepts.
Question
Can gravity be so strong that light slows down to nothing or even a negative speed? I thought the general limitations in Relativity were than gravity can become so strong that light slows down to almost nothing but not quite? Aren’t gravity and light speed inversely related, the stronger the gravitational pull, the slower light speed will be in trying to escape the gravitation pull, till the point where gravity is almost infinitely strong and light speed is almost infinitely small?
Related thread
Black holes and whether General Relativity views light as a ballistic particle?
https://www.physicsforums.com/showthread.php?t=268585