Seeing the Light
I finished Price, "Cosmology, Time's Arrow, and That Old Double Standard". The double standard basicly says that if you use fine tuning (far from likely conditions) to get inflation and smoothness but later argue that times arrow is the direction of most statisticly likely evolution you are guilty of holding a double standard.
A fun quote:
"For present purposes the latter issue -that as to why the universe is not less homogeneous- is the more pressing"
Just a transitionary sentence of no real merit, except as an example of the kind of double-talk that obscures the issues. Science writing is full of bombast like this and worse. On multiple occasions I found myself counting off the conjoined negatives on my fingers. I guess if I was critiquing Hawking I would probably obfuscate a little out of nervousness.
My perspective on the issue of the closed universe, entropy, and time is still clouded.
Huw says that in a Gold universe entropy decreases close to any singularity, eg wacky physics near black holes. But isnt there a difference between the radius from a black hole and the fiducial cosmological size scale measure (a)? But I guess I always expected wacky thermodynamics near black holes anyway because with any kind of horizon, all microstates are not accessable, which I was taught is a key assumption for the statistical definition of entropy.
My favorite part is the examination of time sense when observing between positive and negative entropy gradients. The telescope cools when you point it at a reverse galaxy. Speaking of which, what is the "bilking argument"? Besides the loud discussion with my MCI representive. The funny stuff gets funnier when the discussion turns to the apparent paradox of time direction and radiation. There should be a whole bunch of radiation from the reverse universe right now (since the time goes backwards and is passing us in the opposite direction as we speak) Huw says we dont see this cause we have to look backwards to see reverse radiation and we can only see forwards. I wonder if he wrote this stuff with a straight face... But I say to him, what about scattering? I guess it doesnt matter because its still reverse scattering... arg!
I still like my donut theory.
Ah, the sillyness of time cosmology.
A fun quote:
"For present purposes the latter issue -that as to why the universe is not less homogeneous- is the more pressing"
Just a transitionary sentence of no real merit, except as an example of the kind of double-talk that obscures the issues. Science writing is full of bombast like this and worse. On multiple occasions I found myself counting off the conjoined negatives on my fingers. I guess if I was critiquing Hawking I would probably obfuscate a little out of nervousness.
My perspective on the issue of the closed universe, entropy, and time is still clouded.
Huw says that in a Gold universe entropy decreases close to any singularity, eg wacky physics near black holes. But isnt there a difference between the radius from a black hole and the fiducial cosmological size scale measure (a)? But I guess I always expected wacky thermodynamics near black holes anyway because with any kind of horizon, all microstates are not accessable, which I was taught is a key assumption for the statistical definition of entropy.
My favorite part is the examination of time sense when observing between positive and negative entropy gradients. The telescope cools when you point it at a reverse galaxy. Speaking of which, what is the "bilking argument"? Besides the loud discussion with my MCI representive. The funny stuff gets funnier when the discussion turns to the apparent paradox of time direction and radiation. There should be a whole bunch of radiation from the reverse universe right now (since the time goes backwards and is passing us in the opposite direction as we speak) Huw says we dont see this cause we have to look backwards to see reverse radiation and we can only see forwards. I wonder if he wrote this stuff with a straight face... But I say to him, what about scattering? I guess it doesnt matter because its still reverse scattering... arg!
I still like my donut theory.
Ah, the sillyness of time cosmology.
Labels: Entropy, Readings, Time's Arrow
0 Comments:
Post a Comment
<< Home