Can a Universe be Reborn from a Super Massive Black Hole?

Can a Universe be Reborn from a Super Massive Black Hole?

by Ju Boo Lim - Tuesday, 29 October 2019, 11:38 am 

Earlier I posted my answer on the Schwarzschild radius for a black hole for the Sun, Earth and Moon asked in this forum discussion

 I gave the answers as:

1.       The Schwarzschild radius for the Sun = 2,954 metres

2.       The Schwarzschild radius for Earth = 8.869513457 x 10-3 metres

3.       The Schwarzschild radius for the Moon 1.0913 x 10 -4 metres .

Then I worked out the Event Horizon radii also for the other two biggest planets in our Solar System, namely, Jupiter and Saturn

Here are the results:

1.       Schwarzschild radius for Saturn 0.844 metres

2.       The Schwarzschild radius for Jupiter 2.82 metres

But I forgot to mention it is not possible for any planet or star except for a neutron star or stars with at least 5 – 10 solar masses to become a black hole when they burn out their nuclear fuel and began to collapse under gravity

What I wrote there and here are just in theory and only for academic interest based on the equation 2Gm/ c2 where G = gravitational constant, m = mass of the star, and c = velocity of light.

But in practice it is neither possible for our own Sun, nor the Earth and Moon to collapse into a black hole because none of them are massive enough.

Even our own middle-age Sun when it runs out of fuel in another 5 billion years’ time, may just bloat up as a giant red star to engulf the Earth, maybe up to Jupiter. It is just not massive enough to become even a neutron star, let alone a black hole.

But suppose all the 250 billion sun-like stars in our own Milky Way Galaxy and the entire Universe were to run out of hydrogen-helium fuel and collapse in theory, what then would the sizes of their black hole?

Here’s the answer I worked out for theoretical academic interest only

1.       The Schwarzschild radius for the Milky Way 1.7133 x 10 15 metres = 181 light year

2.       The Schwarzschild radius of the Universe 8.911 x 1025 metres = 9,419,661,734 light years

Again, this may not be likely as the individual stars masses are different, and their life spans are also different, and it is highly they will not all collapse together at the same time to become  the most massive and biggest black hole in the future 

But what happens if they do? Will their Schwarzschild radius remain the same?

My feeling is, probably the density would be so enormous that even their supermassive black hole itself may squeeze even further to become just one point as if it was in the beginning before the Big Bang.

Is this possible? If this is possible my feeling is that the Universe can begin another episode of the Big Bang, collapse, Bang again like a Pulsating Universe. Is this possible?

I am not saying my “theory” is correct or possible. I am only asking a question out of academic interest

Thanks for reading

jb lim

Malaysia