Dr. Karan Jani Profile picture
Oct 29, 2017 7 tweets 3 min read Twitter logo Read on Twitter
1. Modest attempt to summarize PhD thesis in 10 tweets. It presented a theoretical, observational & astrophysical perspective on black holes
2. Thesis had 3 parts (10 Ch.): #NumericalRelativity (Einstein on supercomputers), blackhole search in #LIGO & #GravitationalWave universe👇🏻
3. #NumericalRelativity simulation gives us EXACT spacetime physics when 2 black holes collide. It takes 50k hours on fastest supercomputers
4. We provided a recipe to conduct such simulations & extract dynamics of black holes in extreme gravity (when they collide at ~speed of💡)
5. When the very first gravitational wave was recorded by LIGO, 100s of our simulations helped to prove the signal came from black holes.
6. One of the algorithm to 1st detect gravitational wave is so robust, it doesn't even need models for blackhole! We showed its applications
7. Using this algorithm, we surveyed volume of space containing 100mil galaxies to look for Goldilocks of black holes (100-10000x mass of 🌞)

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More from @AstroKPJ

Apr 6, 2018
Starting a recurring thread on BLACK HOLES. From history to our modern understanding and, in between, any bizarre facts about it.
1. The idea of "dark stars" - from where light cannot escape - became obvious since we figured in the late 1600s that the speed of light is indeed finite. Here is a quote by philosopher-scientist John Michell from 1784.

(Source: Wikipedia)
2. After Einstein published his breakthrough paper on Special Theory of Relativity in 1905, it was known: (i) nothing travels faster than the speed of light, (ii) speed of light is constant for all observers. Therefore, a "dark star" is 'black' for all observers of the Universe.
Read 21 tweets

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