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Author Topic:   Does the universe have total net energy of zero?
cavediver
Member (Idle past 3665 days)
Posts: 4129
From: UK
Joined: 06-16-2005


(1)
Message 224 of 404 (645480)
12-27-2011 11:00 AM
Reply to: Message 223 by designtheorist
12-27-2011 10:03 AM


Re: Not a Bad Parable - I Fixed It
My guess is that either Clarke or Cano picked up Feynman's calculations prior to the renormalization, a step Feynman certainly knew was necessary.
You are talking pure gibberish again. Renormalisation (a process typically used in quantum field theory) has nothing to do with the calculations that Feynman was performing (purely classical, i.e. non-quantum). If you are going to use big words from physics, please ensure you know what they mean and how they are used.
Talking of gibberish...
Perhaps you missed the reasons the pseudotensor argument was rejected.
By whom?
The pseudotensors are not based on observational cosmology.
No, they are mathematical entities used in calculations. Do you also object to vector components as they are also not based upon "observational comsology"?
Many people reject pseudotensors saying they do not apply to general relativity.
Who are these "many people"?
What do you mean by them "rejecting" pseudotensors?
What do you mean by pseudotensors not "applying" to General Relativity, given that it is precisley in the field of General Relativity where pseudotensors are used
Edited by cavediver, : No reason given.

This message is a reply to:
 Message 223 by designtheorist, posted 12-27-2011 10:03 AM designtheorist has replied

Replies to this message:
 Message 228 by designtheorist, posted 12-27-2011 12:55 PM cavediver has replied

  
cavediver
Member (Idle past 3665 days)
Posts: 4129
From: UK
Joined: 06-16-2005


Message 227 of 404 (645496)
12-27-2011 12:22 PM
Reply to: Message 226 by designtheorist
12-27-2011 11:56 AM


Re: Not a Bad Parable - I Fixed It
Did you happen to read the web page by John Baez I linked above? According to the calculations he presents, the ratio of negative energy to positive energy if off by more than three decimal places.
1) That wasn't John's site, it was Bradford's.
2) Bradford's mass of Universe figure is way out. Once corrected, you will see he will get equivalent negative mass ~ positive mass, as already shown by Feynman, Modulus, and just about everyone else.
This is getting really tedious now.

This message is a reply to:
 Message 226 by designtheorist, posted 12-27-2011 11:56 AM designtheorist has replied

Replies to this message:
 Message 230 by designtheorist, posted 12-27-2011 1:06 PM cavediver has replied

  
cavediver
Member (Idle past 3665 days)
Posts: 4129
From: UK
Joined: 06-16-2005


(1)
Message 232 of 404 (645511)
12-27-2011 1:22 PM
Reply to: Message 228 by designtheorist
12-27-2011 12:55 PM


Re: Not a Bad Parable - I Fixed It
Renormalisation (a process typically used in quantum field theory) has nothing to do with the calculations that Feynman was performing (purely classical, i.e. non-quantum).
I'm not sure why you are claiming Feynman was not working in quantum theory.
What the hell are you gibbering about now? Feynman worked on many things in his life. At the moment, we are talking about a classical back-of the-envelope calculation he performed that has nothing to do with quantum theory.
Regarding pseudotensors being valid objects or not, perhaps I should have said "some people" instead of many people. Wikipedia says:
So who are these "some people"? I note that no reference is given so you simply have a single unattributed comment from Wikipedia, which goes on in the same sentence to point out why these "some people" are wrong!! And from this, you have the gall to state:
Perhaps you missed the reasons the pseudotensor argument was rejected.

This message is a reply to:
 Message 228 by designtheorist, posted 12-27-2011 12:55 PM designtheorist has replied

Replies to this message:
 Message 239 by designtheorist, posted 12-27-2011 4:07 PM cavediver has replied

  
cavediver
Member (Idle past 3665 days)
Posts: 4129
From: UK
Joined: 06-16-2005


(1)
Message 234 of 404 (645513)
12-27-2011 1:29 PM
Reply to: Message 230 by designtheorist
12-27-2011 1:06 PM


Re: Not a Bad Parable - I Fixed It
I have not been able to locate the 1962/63 Feynman paper yet
Here's the relevant part:
If now we compare this number (total gravitational energy M2G/R) to the total rest energy of the universe, Mc2, lo and behold, we get the amazing result that GM2/R = Mc2, so that the total energy of the universe is zero. It is exciting to think that it costs nothing to create a new particle, since we can create it at the center of the universe where it will have a negative gravitational energy equal to Mc2. Why this should be so is one of the great mysteriesand therefore one of the important questions of physics. After all, what would be the use of studying physics if the mysteries were not the most important things to investigate.
Evidence for the position is completely lacking.
Clearly
Every calculation and paper presented you have desperately dismissed despite your blatent incomprehension. You really are clutching at any available straw to be able to claim that you are right and Feynman, Hawking, Guth, Krauss, etc are wrong. You are hilarious.
What I find tedious are your unsupported assertions.
I really couldn't give a shit about anything you find.
Edited by cavediver, : No reason given.

This message is a reply to:
 Message 230 by designtheorist, posted 12-27-2011 1:06 PM designtheorist has not replied

  
cavediver
Member (Idle past 3665 days)
Posts: 4129
From: UK
Joined: 06-16-2005


(2)
Message 238 of 404 (645523)
12-27-2011 4:05 PM
Reply to: Message 236 by Percy
12-27-2011 3:18 PM


Re: Not a Bad Parable - I Fixed It
There are people here who would love to dispassionately discuss physics with you
Really? Throughout this thread we have seen examples of designtheorist making dogmatic statements of "fact", only to be shown each time that he is incorrect; making accusations of errors, each time only revealing ignorance of the subject.
There is no disgrace for ignorance in this subject area - it is complex and immensely counterintuitive - and questions and requests for explanations will be treated with respect and courtesy by many here. But the hubris being shown by designtheorist is off the scale. Why on earth would anyone want to discuss physics with someone showing such characteristics?
but it seems like both sides have too big a stake in being right.
Sides? I'm sorry, I don't see any sides. Unless a blind man declaring that the sky is orange is a "side".

This message is a reply to:
 Message 236 by Percy, posted 12-27-2011 3:18 PM Percy has seen this message but not replied

  
cavediver
Member (Idle past 3665 days)
Posts: 4129
From: UK
Joined: 06-16-2005


Message 241 of 404 (645526)
12-27-2011 4:21 PM
Reply to: Message 239 by designtheorist
12-27-2011 4:07 PM


Re: Not a Bad Parable - I Fixed It
I see where you are confused. Feynman's name has come up on this thread in respect to two separate calculations. One is the net zero energy calculation. The other has to do with the energy density of empty space.
Ah, ok - sorry, yes I thought you were talking about the net zero calculation. The infinity answer to the cubic meter of empty space is simple quantum mechanics, and gives you one of the five answers that Baez presented. It is completely meaningless for this current topic. Baez's point about the zero-point energy best being considered as undetermined by quantum theory is the right way forward on that particular issue. Feynman was pointing out what a naive application of quantum mechaincs would produce.
I have clearly stated that I am more interested in observational cosmology because observation trumps theory.
But how do you measure the effective negative gravitional energy of the Universe from observation? You cannot. It requres taking observationally determined parameters and feeding them into the theory - General Relativity in this case. Without the theory, you would still think you were living in a Newtonian universe.
The only observational calculations presented so far show the ratio of positive to negative is not 1 but is off by three decimal places.
No, it is not. That is a recreation of the Feynman net-zero calculation, but has the mass of the Universe off by three decimal places. Once corrected, this makes the positive and negative energy contributions equal up to order of magnitude. As Feynman demonstrated.
Edited by cavediver, : No reason given.

This message is a reply to:
 Message 239 by designtheorist, posted 12-27-2011 4:07 PM designtheorist has replied

Replies to this message:
 Message 244 by designtheorist, posted 12-27-2011 9:34 PM cavediver has replied

  
cavediver
Member (Idle past 3665 days)
Posts: 4129
From: UK
Joined: 06-16-2005


Message 249 of 404 (645581)
12-28-2011 7:36 AM
Reply to: Message 244 by designtheorist
12-27-2011 9:34 PM


Re: Not a Bad Parable - I Fixed It
This is correct, but the pseudotensor approach does not do this. The pseudotensor approach works exactly the same way after the discovery of dark energy as it did before.
Wrong, that approach works with a cosmological constant, , whatever its value. So it works with no dark enegy - - and it works with dark energy - .

This message is a reply to:
 Message 244 by designtheorist, posted 12-27-2011 9:34 PM designtheorist has not replied

Replies to this message:
 Message 250 by NoNukes, posted 12-28-2011 8:22 AM cavediver has not replied

  
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