Physicists create black hole for sound

The mystery of the Hawking radiation may be explained by this. So, just like sound, if matter moves faster than light then the light that the matter carries gets trapped by the gravity and we cannot detect the light. Therefore the universe may have these massive black holes that may be holding something that reaches us but we do not know about the properties of these objects. Assuming that this something travels faster than light. Blackholes can be determined by the gravity they exert on other objects, but other properties of blackholes may not be visible to us. There may be anti-matter in these black holes that is not reaching us. This anti-matter may hold the answer to the mystery of the universe.

There was news recently that they have made radio waves travel faster than light. This test could be done with radio waves to see what happens to them in a black hole. Radio waves dont have light (?) but other properties can be tested.

An artificial black hole that traps sound instead of light has been created in an attempt to detect theoretical Hawking radiation. The radiation, proposed by physicist Stephen Hawking more than 30 years ago, causes black holes to evaporate over time.

physicists have also been developing 'black holes' for sound. They do this by coaxing a material to move faster than the speed of sound in that medium, so that sound waves travelling within it cannot keep up, like fish swimming in a fast-moving stream. The sound is effectively trapped in the stream-like event horizon.

The team cooled 100,000 or so charged rubidium atoms to a few billionths of a degree above absolute zero and trapped them with a magnetic field. Using a laser, the researchers then created a well of electric potential that attracted the atoms and caused them to zip across the well faster than the speed of sound in the material.

Source: www.newscientist.com...

You're seriously misunderstanding the whole notion of a black hole. It is certainly possible for something to travel faster than sound in a medium. We have jets that do that. They break the "sound barrier", which only means they're moving faster than sound.

You aren't going to find matter moving faster than the speed of light in a vacuum, however. That's not what makes a black hole. A black hole forms when a star collapses as a result of its own gravity. If the star is big enough (about 3 times the mass of our sun), the gravitational force is stronger than the nuclear forces resisting the collapse. The star would grow smaller and denser, until it became a black hole.

Supposedly the mass of the star winds up occupying a single point, making the star's density infinite. This is not universally accepted. What is more generally accepted that a black hole has something caled the "event horizon" that represents the "point of no return" for anything falling into the black hole. Before passing this event horizon, an object could at least in theory escape. Once this event horizon is passed (going inward), nothing can escape. It's like a Roach Motel for matter and energy. It checks in, but it doesn't check out.

There is no mystery about Hawking radiation. Stephen Hawking proposed this radiation some decades ago, and explained it then. Matter-antimatter pairs (virtual particles) are formed just beyond the event horizon. This happens all the time in space everywhere. But just beyond the event horizon, it can happen that one of the pair of particles falls into the black hole, while the other particle escapes. since the sum of the energy of these virtual particles must equal zero, but since one escapes (making the energy positive), the one that fell into the black hole is considered negative energy. The black hole loses a bit of mass. If the black hole loses more energy (mass) than it gains, then eventually it will disappear. AFAIK, Hawking radiation has not been observed, so we've got an explanation in search of a phenomenon that we don't know exists.

As for antimatter in the centers of black holes - well, we can't know, because we can't get anything past the event horizon. Nothing can come out. If we go in to find out, we can't come back out to talk about it. So no information can escape from a black hole, either.

Still, since the black hole was formed as a result of matter collapsing, I see no good reason why it should turn into antimatter.

reply to post by chiron613


In addition, Sound, like voltage, is an effect of energy. A sound wave has no existance of it's own, rather it exists as an effect on matter.

This is always hard for me to explain, but let's give it a shot. When you turn to someone in the grocery store and say "hey great price on spam, eh?", that sound reaches them at approx 750MPH. But they do not get hit by a 750mph gust of air from your mouth. In fact the air from your mouth doesn't go more than a foot or so and only travels about 10-20 MPH. The wave effect of the sound is transmitted from one molecule of air to another. This transmission effect has no speed limit and could *theoretically* be coaxed to go much faster than light depending on the material it is travelling on.

Originally posted by rogerstigers
reply to post by chiron613

 

In addition, Sound, like voltage, is an effect of energy. A sound wave has no existance of it's own, rather it exists as an effect on matter.

This is always hard for me to explain, but let's give it a shot. When you turn to someone in the grocery store and say "hey great price on spam, eh?", that sound reaches them at approx 750MPH. But they do not get hit by a 750mph gust of air from your mouth. In fact the air from your mouth doesn't go more than a foot or so and only travels about 10-20 MPH. The wave effect of the sound is transmitted from one molecule of air to another. This transmission effect has no speed limit and could *theoretically* be coaxed to go much faster than light depending on the material it is travelling on.

Thats because waves don't permanently displace media.