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With a black hole, as it accumulates mass, the event horizon expands. Hawking radiation can cause evaporation and this should result in mass loss and a reduction in the event horizon over time. What happens in the case of a white hole? Matter can only be ejected from a white hole. While a black hole can stop light at its horizon it may be that a white hole's horizon is where the speed of light is reached and spacetime is then ejected along with the mass within it. Would this result in a shrinking or expanding horizon? What about radiation or one of a pair of particles out of the horizon? Does this reduce the mass of the cosmic bulk? What actually drives the expansion outwards?This is my next project.
Well we haven't seen one up close but there is plenty of evidence that a variety of dense objects exist. The ultimate dense object is a black hole.
box, box, box...I haven't directly observed you, but I have enough indirect evidence to assert that there is an incredibly dense object which does not shed light on anything... (sorry, I had to)Similarly, by observing the movements of stars at the center of our galaxy, we are able to assert that there is an incredibly dense (lots of mass in a small volume) region that does not emit light. Observations of radiation bursts also corroborate the notion of black holes existing.
We are not 100% certain about anything. We have evidence. As more evidence is gathered, some theories are ultimately shown to be false, and better explanations are found, but no matters are completely settled. Ever. That does not mean that these theories are useless.
This is my next project.
Quote from: jeffreyH on 09/04/2015 00:11:31This is my next project.What will your starting point be?