Recent content by AWA

Ah, ok, you mean a history of 10^-32 seconds. A bit short to call it hystory I'd say, but time is relative or so they say. If inflation were true, let's imagine it is, there you have your fundamental law for the structure of the distribution of matter at large-scale, don't you think?

If the homogeneity and isotropy were there from the very first moment of existence of matter, I can't figure out what particular history you refer to here.

I like wikipedia and often use it, but you must be aware of its limitations, and contrast info with other sources, the problem with traditional encyclopedias is different, they are dated very fast, many by the time they get published. To keep on topic, I'd like to ask you if in your opinion...

Sure, if they are right, then it should be impossible. The problem to use this as support of the standard model is that it might be highly improbable to find any with our current technology in a reasonable amount of time if the models weren't in fact right. How would you calculate the...

What was the name of the model before it was called LCDM? I call it CDM since we didn't know about dark energy yet, in that thread two fish argues that the dscovery of the accelerated expansion was a pretty radical thing at the time and that it took some effort for cosmologists to make it fit in...

Have you read the posts? Starting with posts 19 and 22 and subsequents.

In this thread you say exactly the opposite to Old Smuggler https://www.physicsforums.com/showthread.php?t=425163&page=2 I guess you are the argumentative type without real solid positions on anything, that changes arguments on convenience. Like you are trying to sell arguments and you can...

I specified it is circular when they are used without other aditional observations. Certainly is hard to find something "really big" like many of the things you list because we would have already found out, accelerated expansion was pretty radical and could have killed CDM , but as Chalnoth...

I meant that the observation has been claimed, not entering on whether the claim is right, I was using it just as an example since Chronos brought it up. The core of my reflection is more general, and it's been generally responded by saying that noone's come up with anything better than what...

Well that observation seems to have been made but discredited on grounds of impossibility according to our model, and statistical irrelevance. So it's a good example of what I am saying, discordant observations are either integrated, dismissed as irrelevant for statistical reasons, or completely...

Unless the model is built in such a way that whenever an observation that doesn't agree with the assumptions does show up (say, like faint SNaeIa) it can be integrated by changing the parameters of the model. So it's not so simple, the assumptions are alway right it seems, or would you give me...

I can't quite follow the logic from the invariant vacuum tensor to the necesity of including some sort of universal time coordinate in the presence of matter. Precisely GR is about the possibility to formulate any metric. Obviously this metric will include a time coordinate that you can consider...

Well, this is actually a deviation or distraction from the main discussion. It is quite obvious that General covariance affects the GR field equations, not individual tensors, therefore the specific covariance or invariance (or lack of) of the matter stress-energy tensor is totally irrelevant...

I probably didnot express it correctly, I was considering that when in the vacuum solutions of GR we make Tab=0, so I figured that all the components are zero in this case, on the other hand, I realize that vacuum is supposed to have some energy, very high according to QFT, so I'm a little...

So , the vacuum tensor obviously satisfy it since all its components are zero and the electromagnetic tensor too because it has no trace so it has a Poincare group, right? But massive fields wouldn't because they would have to have pressure components with opposite sign to the energy density...