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Old March 8, 2004, 10:20   #91
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(there are actually some promising leads)

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Old March 8, 2004, 10:22   #92
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Originally posted by Jon Miller
well, I have not ran into one of his theories in my classes
I suppose it depends what he means by 'few'. I would probably rank him in the top 100 living particle physicists, but that doesn't include other branches of physics or anyone dead. His renown is purely because of his disability - if he didn't have his condition, no-one outside physics would have heard of him.

Have you heard of Sydney Coleman for example? Or Sheldon Glashow? Or Howard Georgi? Or Matinus Veltman? They have all had more impact imho, and I could go on and on....

I am sure he is cleverer than me though
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Old March 8, 2004, 10:24   #93
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Originally posted by Rogan Josh


Have you actually read any papers written by these 'eminent scientists'? Or are these theories translated to you via the popular media? So are you saying that you believe pro-Big-Bang scientists because they have the best PR? I too am an 'eminent scientist', but you never believe anything I say

The Big Bang is an extrapolation of known physics over 17 orders of magnitude. Doesn't that seem like a big leap to you?

Let's tackle just one problem with the big bang. The idea with the BB was that there was an initial explosion of energy and all matter was created out of that energy, right? Basically, there was a wash of photons (light) and a lot of the photons split into particle-anti-particle pairs, creating the matter we see around us today. But what happened to all the anti-matter? The theories all tell us that anti-matter must have been produced in equal amounts - so where did it go?

This is known as the Baryon-Asymmetry problem and is just one of the many many problems we have with the BB. But we never hear anything about it in the popular press.
Easy answer. It has been shown that certain antiparticles have a propensity to turn into normal particles. That, along with other things, is why the universe would not behave the same if every particle was switched to its anti-(or anti-anti-)particle.
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Old March 8, 2004, 10:24   #94
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Last I had read, matter and antimatter were NOT created in equal amounts, but instead matter was created in slightly large amounts, and what we see is the matter that was left after most matter and anti-matter annahilated themselves.
That's the idea, but it doesn't work. They need to have a theory which explicitly violates CP (which is essentially a time-revesal symmetry). The Standard Model does this (and this has been verified experimentally) but not nearly enough to explain the baryon asymmetry.
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Old March 8, 2004, 10:26   #95
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There is no temporal symmetry. There is ATP symmetry, though (antimatter temporal parity). If you ran the universe backwards, switched left and right, and turned every particle into its antiparticle, the universe would look exactly the same.
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Old March 8, 2004, 10:46   #96
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There is no temporal symmetry. There is ATP symmetry, though (antimatter temporal parity). If you ran the universe backwards, switched left and right, and turned every particle into its antiparticle, the universe would look exactly the same.
That is the whole point. If you assume CTP (it is more usual to use 'C' for 'charge conjugation') then CP-violation is the same as T-violation. The Standard Model violates CP and thus T, but only a little bit.
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Old March 8, 2004, 10:47   #97
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It violates CP symettry because there IS not CP symmetry. Only CPT.
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Old March 8, 2004, 10:49   #98
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there is CP symmetry

it is just broken in weak interactions

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Old March 8, 2004, 10:50   #99
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Rogan Josh

were you a particle phenomenologist?

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Old March 8, 2004, 10:50   #100
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Thus, there ISN'T CP symmetry...
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Old March 8, 2004, 10:53   #101
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if so could you help me with my HW?



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Old March 8, 2004, 10:54   #102
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Quote:
Originally posted by skywalker
Thus, there ISN'T CP symmetry...
yes there is

it is just broken in some interactions

it is an excellent symmetry in strong interactions for example

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Old March 8, 2004, 11:12   #103
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Science and Religion are not mutually exclusive.

Volkswagon built my car. I can study the end product as much as I want, indeed until I understand everything about every part and build the car myself. It doesn't change the fact that Volkswagon made the car. Science is the study of the works wrought by God. I don't believe in the "puff there it is" version of creationism. God is a little more creative than that

And while religion ultimatley requires faith, how is science any different? Religious minded people examine their form of "evidence," mainly metaphysical, and come to a point where they can accept a theory as true. Scientists collect as much evidence as possible, normaly physical, until they come to a point where they can accept a theory (note THEORY of gravity) as true.

And lets not kid ourselves, each side also shares a very similar trait: not everyone comes to the same conclusion. There are many different religions, and then sects within each religion. There are many different scientific theories out there, and many different divisions about the understanding of those theories.

Neither side has given up on inovation or modification of those theories. I know hundreds of poeple, who after examining the "evideance", switched from one religion to another. I also know many college chums who have changed their line on science from week to week. New religious groups form every day, new scientific theories are advanced every day, and the most extreme of the inovators in each field are treated in much the same way.

The only difference between religion and science is what each consider evidence, and since the evidence for each comes from idependant sources (pysical or non) they can exist happily next to each other. Unless of course you are hell bent on MAKING contridictions (ie hard corps creationists).
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Old March 8, 2004, 11:18   #104
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Quote:
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Science and Religion are not mutually exclusive.
Indeed. It was a Catholic priest who's work the theory grows out of.
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Old March 8, 2004, 11:27   #105
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Originally posted by Jon Miller
Rogan Josh

were you a particle phenomenologist?

JM
I would like to think that I still am!

Yes, CP is exact in strong interactions. It is just violated in weak interactions. The interesting question is whether or not it will be violated by the Higgs boson's interactions. If it is, then maybe we can scrounge up enough CP violation to get round the baryon assymmetry problem.

To my mind, this will be one of the most interesting things to look for at the Large Hadron collider (although supersymmetry would be pretty exciting too )
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Old March 8, 2004, 14:37   #106
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Indeed. It was a Catholic priest who's work the theory grows out of.
And whats even more surprising is that he was Belgian.
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Old March 8, 2004, 16:43   #107
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Quote:
Originally posted by Jon Miller


yes there is

it is just broken in some interactions

it is an excellent symmetry in strong interactions for example

JM


That's like saying the human body is symmetrical - except if you look at the heart and a bunch of other organs
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Old March 8, 2004, 21:42   #108
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Originally posted by Kucinich




That's like saying the human body is symmetrical - except if you look at the heart and a bunch of other organs
denzel washington is symmetrical.
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Old March 8, 2004, 23:15   #109
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Quote:
Originally posted by Kucinich




That's like saying the human body is symmetrical - except if you look at the heart and a bunch of other organs
yes

and making even bigger statements (like that Md = Mu = 0 and so there is an additional symmetry) seems to be half of what particle physics is based on (I am only a second year Grad Student)

if you don't like that, than you don't like physics since the 60s

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Old March 8, 2004, 23:20   #110
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I was once teaching some (mostly science) students about Empedocles and they were complaining that "Love" and "Strife" were stupid names for cosmological forces.

So I said, "The Big Bang?"

...and there was an embarrassed silence.

You'd think that they could have come up with a better name. I mean, presumably there was no atmosphere of any kind, so it didn't even make an audible noise.
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Old March 8, 2004, 23:24   #111
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the name was created by a preist

it gained popularity in the media, we didn't really see the point of renaming it

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Old March 8, 2004, 23:26   #112
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Is that the royal "we"?
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Old March 8, 2004, 23:26   #113
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No, it wasn't. It was coined by critics of the theory.
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Old March 8, 2004, 23:29   #114
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Lay off the green hats, niDe. They will be the death of you.
Not death, just PCR
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Old March 8, 2004, 23:32   #115
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Old March 8, 2004, 23:33   #116
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No, it wasn't. It was coined by critics of the theory.
So it wasn't a priest and it wasn't John Miller.

You'd think that there was a better name for it. How about "The Primal Eructation"?

Back OT - I don't care one way or the other. I fail to see how a big bang makes any difference.

In some respects the elephants/tortoise theory is better.
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Old March 8, 2004, 23:33   #117
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'You see people, to believe in Big Bang is to believe in God, for if an entire universe can come into existence from nothing and since this event has never happened again, then this single event, this creation of Universe, this Big Bang must be God's will and work.'

who said the big bang was the start of it all??? perhaps the bigbang is just somewhere in the middle of a larger process. who said it's never happened before??? maybe many bigbangs have happened in the past. maybe there are several areas right now that are the results of a big bang.
So you will concede your (scientific!) religion to the dustbin of an infinite regressive?

So what did start it all?
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Old March 8, 2004, 23:34   #118
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Quote:
Originally posted by Agathon
In some respects the elephants/tortoise theory is better.
Which ones?
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Old March 8, 2004, 23:36   #119
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You'd think that there was a better name for it. How about "The Primal Eructation"?
Blame Fred Hoyle.
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Old March 8, 2004, 23:40   #120
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Don't you get smart with me boy!!

Obviously, the one with four elephants and one tortoise. Why would any rational person believe otherwise?
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