Our Universe 2: Redshift, Expansion & Dark Energy (Everyones Guide Series Book 16)

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Or we need to show that the idea is predictive in a way that alternative ideas are not. There are many unresolved issues surrounding SM and they are all well-documented in the literature,. Reading your articles made me think that my gut reaction was misguided. I have been concerned about whether naturalness was a good guide since , when the non-zero cosmological constant was discovered.

I was not alone. However, we cannot yet conclude whether naturalness is or is not a good guide. We need to proceed with open minds, and pursue all reasonable avenues — even rather wild-looking ones — until data provides additional clues.


I was wondering about that. If so we are short a few oom at worst!? Dear Professor, is emergence and naturalness synonymous? Emergence, in my mind, is a bit different in that if you start with the simplest of variables and have enough of them around, high intensity, then a change will happen because of chaos, there is no symmetry.

Because cancellation is impossible because we exist and the universe is infinitely large. If cancellation were possible then nothing would exist. So I see emergence as a better theory, place the ingredients in a pot, warm it up while stirring and allow it to cook and every time you stop the cooking time you will get a different flavor.

Put it back into the pot and repeat the process. Infinite small to infinite large is equal to 1. I am wondering if this issue exists independent of any cosmology? If the solar system was in the middle of an obscuring thing so that we could never have a theory as to whether the universe is expanding or not or is infinite or not, would this problem you are referring to still exist? But cosmology — standard or not — might bring in a quite surprising solution, or allow the problem to be evaded in a surprising way.

This is science in progress, and to solve the mystery, we need more data, and hopefully, the LHC will soon add new clues to this story. Just one number, the Higgs boson mass, and yet, out of this number we learn so much. I started from a hypothesis, that the known particles are all there is in the universe, even beyond the domain explored so far. From this, we discovered that the Higgs field that permeates space-time may be standing on a knife edge, ready for cosmic collapse, and we discovered that this may be a hint that our universe is only a grain of sand in a giant beach, the multiverse.

Well, I have had many conversations with Giudice, even over the last three days, including a half hour on the bus this afternoon. In this particular paragraph, perhaps for literary reasons, he presents himself as sure of this point of view; but in the scientific context, he is not so sure, and indeed, like most first-rate scientists, he considers many points of view, in order to try to see which one makes the most sense. Naturally we strive for elegance and accuracy.

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You can never know that any theory is the final correct one unless you observe the universe from outside. As you know Professor, it is possible to measure the strength of the wind by use of an anemometer, or light a lucimeter as the wind and light shall have a force. But supposing the principal mechanism of this universe does not have any so therefore we cannot measure it. However, but without it we would have no Space for classical physics or SMoP to exist. I am not sure that is possible, anything that has an effect on anything else can be measured.

How would something that by definition is responsible for all the effects e immeasurable? Do you have an opinion on this approach Matt? I have strong objections also. Many of these objections were also articulated with some slight differences by Schmaltz and Skiba. One set of objections are simply that the particles and forces that we know will not fit into this framework [there are scales at high energy that you cannot avoid, killing the idea on line one] unless you add new particles and perhaps forces at or around the TeV energy scale — just as in all other proposed dynamical solutions to the hierarchy problem, including supersymmetry etc.

And what Giudice showed today is just how complicated it is to find a set of additional particles and forces that are necessary in order to give this idea even a hint of a chance of working. I was not generally surprised though some of the details were eye-opening , but in any case it is good to see an explicit study. Another set of objections is that even if you succeed at this first stage, the properties of gravity will kill the idea.

No proposal for making gravity less dramatic at the Planck energy scale will avoid problems before you get to that scale. It is instructive to note here that precision measurements of electroweak parameters and of the electron dipole moment EDM tend to disfavor new physics at the low TeV scale. To my mind, there is an alternative question: is something else not quite right with one of the theories elsewhere? I do not know enough about the way we get to the standard model to offer anything useful here, but as a general principle in the history of science, one of the best signs that a theory is in trouble is when it relies on really weird coincidence, or extremely tight requirements.

On the other hand, the very tight requirement may actually indicate the presence of a deeper physical principle at work. Who thinks we know most of what there is to know about the physical sciences? I may be out of court here, but I believe a fundamental truth in physics has an inherent beauty to it, and head-scratching weirdness to me is ugly.

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Quotes like:. We cry because they are so gorgeous. You talk about the history of science, but have you learned its lesson? Science changes. The only requirement is that the equations of the new theory reduce to the old in the areas where the old was tested. Coincidences do happen. We humans tend to be suspicious of them, but they do occur. Matt brought up the case of the total eclipse. Once upon a time there was Bodes Law of planetary spacing…now we recognize it for what it was: a coincidence.

Today we have the equality of inertial and gravitational mass, surely that is no coincidence. Of course theories come and go, and a bad problem is that in forming a new theory, the theoretician has to use words to convey the principles, and sometimes the choice of words can be unfortunate, or for that matter, the way of presenting it. I do not know whether you have ever formed a theory that does not fit convention, but I assure you there are real problems.

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For me, the equality of inertial and gravitational mass is not a coincidence, but rather it directs us to ask, WHY are they equivalent? Yes, the apparent equality of size of the moon and sun as seen from here is a coincidence,but the point here is, we know why. It is an accident, and it was not always so.

Obviously, if something is moving away, the solid angle it makes gets smaller, and sooner or later it will equal some other angle. Worse, theories can be lost for the wrong reason. Lavoisier lead to that being rubbished, and while his analytical balance and the use of equivalent weights was a great advance, the dumping of phlogiston set chemistry back almost a century because it buried the chances of finding valence. Think of phlogiston as electrons. What it marks is the temperature variation in the accretion disk, where certain planets only form at certain temperatures.

Very interesting problem. Makes me think of the naturalistic fallacy related to the is-ought problem, examplary for numerous failed economic and social predictions. Thanks for your enlightening post. Is it still realistically possible that naturalness works and there are low ish mass particles that are produced too seldom for the LHC to see them even if the energy would be high enough? Interesting stuff Matt. Pingback: Naturalness is nature The Great Vindications.

Our universe is what it is. It is what it is. Perhaps that is unintentional. But people living on an island cannot understand its nature and origins without looking at the sea and the subsea world from which the island arose. We cannot fully understand our physics and universe until we understand the context in which they arose. Sean : Then what you say means we can never understand our universe since we can never fully understand the context , i think this point is very essential and for me it is an ipso-facto stand.

That will always be.

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Every discovery opens up new questions. Science does not offer full understanding of our universe , just a better understanding than alternative methodologies. Certainly we cannot fully understand the context in which our universe came into being, but that is a far, far different thing than saying we cannot understand our universe. Either way, some unanswered questions will always remain. If you are saying that you think it essential to at least believe that a full understanding of our universe is possible, then I have to disappoint you.

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Complete, total, perfect understanding is not possible. I really mean what you just wrote ….

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Full , Complete , Total , Encompassing understanding of our universe is beyond science and this is what Matt. Just said : M. Many November 17, at AM Reply You can never know that any theory is the final correct one unless you observe the universe from outside. Many, It was not clear to me that you were agreeing! But no matter where you observe the universe from, you cannot acquire full knowledge.

We may as well set that aside; it will never be. That answers a question someone else asked.