More than one Big Bang?

[CraigD]

Originally Posted by Moadib

So Hawking radiation is a possible explaination for what happens to matter in a black hole, …

Hawking radiation provides a mechanism by which black holes “evaporate”, not into a gas, but into about equal numbers of particle and antiparticles which annihilate to produce photons. This takes a tremendously long time, however.

A counterintuitive characteristic of Hawking radiation is that its power (power = energy/time) is

, which is inversely proportional to the square of its mass. The time for a black hole to complete evaporate is

. Thus, a typical stellar mass black hole takes about years, while a supermassive one like our galaxy’s will take about years, durations so large (considering that the universe is currently about years old) as to be practically eternities.

Though it predicts an eventual end of the far, far future black hole era, what Hawking radiation is really good for is explaining why we don’t see lots of small black holes. Using the formula above, a 1 kg black hole would evaporate (“evaporate” is a deceptive word, as the energy released, about , is equivalent to 250 million tons of TNT explosive, released much more suddenly) in less than seconds. Most physicist take comfort in the idea that Hawking radiation assures that nothing we can do with particle accelerators or nuclear weapons can create a little black hole that eats the Earth.

Originally Posted by Moadib

… are there any good explainations for the apparent excesses of the white hole?

The best accepted current explanation is that most super-bright objects once thought of as possible white holes, and generally called quasars (for “quasi stellar”, or “false star-like”) are actually whole galaxies with large amounts of matter falling toward the supermassive black hole in their centers, and being heated to radiate intensely before reaching them. A galaxy in this condition is said to have an active galactic nucleus. AGNs eventually “blow themselves out”, as their radiation drives the infalling matter away from their nucleus, so galaxies spend most of their time with inactive nuclei. Our Milky Way galaxy currently has an inactive nucleus, a fortunate thing for fragile biological beings like us.

[Moadib]

So the excess matter is explained as just a more condensed galaxy? and if the galaxy is compress or close to the black hole why is so much light escaping... not that close?

and craig for president!