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by Drachmar » Thu Jan 14, 2010 9:23 pm
UnhealthyTruthseeker wrote:Drachmar wrote:I have to admit that's totally above my head.
Essentially, I would believe that if the universe is accelerating faster than it did after the initial expansion, that some sort of bubble effect would occur. In other words, we would see a greater expansion closer to the earth, than was measured closer to the edge of the universe.
We're not accellerating faster than the extremely early universe.It goes like this (roughly):
Extremely early = inflationary universe, electroweak era, GUT era, etc. expansion was super rapid here
Radiation dominated era: The dark energy density fell off quite a bit after the initial inflation, leading to an immense release of radiation. At this time the universe expanded like the square root of time.
Matter dominated era: Some of the radiation condensed into matter, a lot of the radiation lost its energy due to the expansion of space stretching out the wavelengths of light. (Remember that the energy of light is proportional to the inverse of its wavelength.) At this time, the majority of the energy in the universe was not light, but matter. At this time the universe expanded like the cube root of time squared.
Dark dominated era: Dark energy density is constant, but matter density isn't. As space expands more and more, the density of matter decreases, but the density of dark energy stays the same. This means that the amount of dark energy eventually overtakes the amount of matter energy. At this time, the universe expands exponentially.
by Drachmar » Thu Jan 14, 2010 9:25 pm
Free Soviets wrote:i got your billions and billions right here, bub
by Errinundera » Thu Jan 14, 2010 9:28 pm
Dragontide wrote:If God is suppose to be the one creating and destroying worlds and star systems then why are the black holes (that are at the center of every galaxy) doing it? God is much bigger than trivial things like one universe's little ole big bang.
by Drachmar » Thu Jan 14, 2010 9:36 pm
Errinundera wrote:Dragontide wrote:If God is suppose to be the one creating and destroying worlds and star systems then why are the black holes (that are at the center of every galaxy) doing it? God is much bigger than trivial things like one universe's little ole big bang.
I guess that means that at the centre of god is a truly gargantuan black hole.
by UnhealthyTruthseeker » Thu Jan 14, 2010 9:43 pm
Drachmar wrote:God really sucks.
by Drachmar » Thu Jan 14, 2010 9:48 pm
by Allbeama » Thu Jan 14, 2010 9:51 pm
by Infactum » Thu Jan 14, 2010 10:56 pm
UnhealthyTruthseeker wrote:Drachmar wrote:I have to admit that's totally above my head.
Essentially, I would believe that if the universe is accelerating faster than it did after the initial expansion, that some sort of bubble effect would occur. In other words, we would see a greater expansion closer to the earth, than was measured closer to the edge of the universe.
We're not accellerating faster than the extremely early universe.
It goes like this (roughly):
Extremely early = inflationary universe, electroweak era, GUT era, etc. expansion was super rapid here
Radiation dominated era: The dark energy density fell off quite a bit after the initial inflation, leading to an immense release of radiation. At this time the universe expanded like the square root of time.
Matter dominated era: Some of the radiation condensed into matter, a lot of the radiation lost its energy due to the expansion of space stretching out the wavelengths of light. (Remember that the energy of light is proportional to the inverse of its wavelength.) At this time, the majority of the energy in the universe was not light, but matter. At this time the universe expanded like the cube root of time squared.
Dark dominated era: Dark energy density is constant, but matter density isn't. As space expands more and more, the density of matter decreases, but the density of dark energy stays the same. This means that the amount of dark energy eventually overtakes the amount of matter energy. At this time, the universe expands exponentially.
by Dragontide » Thu Jan 14, 2010 11:09 pm
Allbeama wrote:Still no proponents of the "God snapped his fingers" theory?
by UnhealthyTruthseeker » Thu Jan 14, 2010 11:33 pm
Infactum wrote:Interestingly, I know a (Physics) grad student who doesn't really accept the Big Bang/Inflationary universe and all that. His position is that the evidence for what happened before a certain time is much to uncertain to really ascertain what was going on (I get the impression the inflation tends to mess with the precision of the data). I'm not really sure how I feel about that, but it was the most interesting argument against modern cosmology I've heard (Physics/Math major here).
by Christmahanikwanzikah » Thu Jan 14, 2010 11:54 pm
UnhealthyTruthseeker wrote:Waterlow wrote:I love it, especially as it's classic '...and then a miracle occurred...' physics of the big holes in equations kind. Which is not to dismiss it, I just like the creativity (something sorely lacking in a lot of physics). Tachyons, for example: genius.
Tachyons aren't accepted by most physicists.
by Astralsideria » Fri Jan 15, 2010 12:05 am
by Drachmar » Fri Jan 15, 2010 2:02 am
Infactum wrote:UnhealthyTruthseeker wrote:Drachmar wrote:I have to admit that's totally above my head.
Essentially, I would believe that if the universe is accelerating faster than it did after the initial expansion, that some sort of bubble effect would occur. In other words, we would see a greater expansion closer to the earth, than was measured closer to the edge of the universe.
We're not accellerating faster than the extremely early universe.
It goes like this (roughly):
Extremely early = inflationary universe, electroweak era, GUT era, etc. expansion was super rapid here
Radiation dominated era: The dark energy density fell off quite a bit after the initial inflation, leading to an immense release of radiation. At this time the universe expanded like the square root of time.
Matter dominated era: Some of the radiation condensed into matter, a lot of the radiation lost its energy due to the expansion of space stretching out the wavelengths of light. (Remember that the energy of light is proportional to the inverse of its wavelength.) At this time, the majority of the energy in the universe was not light, but matter. At this time the universe expanded like the cube root of time squared.
Dark dominated era: Dark energy density is constant, but matter density isn't. As space expands more and more, the density of matter decreases, but the density of dark energy stays the same. This means that the amount of dark energy eventually overtakes the amount of matter energy. At this time, the universe expands exponentially.
Interestingly, I know a (Physics) grad student who doesn't really accept the Big Bang/Inflationary universe and all that. His position is that the evidence for what happened before a certain time is much to uncertain to really ascertain what was going on (I get the impression the inflation tends to mess with the precision of the data). I'm not really sure how I feel about that, but it was the most interesting argument against modern cosmology I've heard (Physics/Math major here).
by United Technocrats » Fri Jan 15, 2010 3:40 am
UnhealthyTruthseeker wrote:So, are there any people here that have a problem with cosmology? That's what this thread is for.
by Acadzia » Fri Jan 15, 2010 4:28 am
by Free Soviets » Fri Jan 15, 2010 8:12 am
by The_pantless_hero » Fri Jan 15, 2010 8:27 am
Bottle wrote:Equality is a slippery slope, people, and if you give it to the gays you have to give it to the polygamists and if you give it to the polygamists you have to give it to the serial dog molesters and if you give it to the serial dog molesters you have to give it to the machine fetishists and the next thing you know you're being tied up by a trio of polygamist lesbian powerbooks and you can't get out because the safety word is case sensistive!
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