We call it "high noon" because of the high star formation rates, but there's still plenty of quenching especially at the "nearer" z (but that's the point, I end up making a lot of figures splitting into four redshift bins of equal comoving space against different metrics so you can kind of "watch" galaxies march towards quiescence under different definitions and with different metrics: sersic n vs. z, axial ratio vs. z, sersic n vs. axial ratio, UVJ in different redshift bins, SFR vs. compactness). I only wish it were possible to more easily cognize a higher dimensional plot so put more of them together in a single plot lol.
I actually haven't had the pleasure to use ANY JWT data even for fun, I've been so busy with CANDELS. :( (They are lovely to look at, though!)
Pleasure to meet you — Astro Cat
Are you folks in astro? I'm graduating with an MS in astro in a matter of weeks (though starting PhD bridge... probably in the fall, I'm taking spring off). Right now I'm researching galaxy quiescence at 0.6 < z < 2.5 and hopefully publishing morphological metrics from CANDELS soon. Happy to see others at least with a cosmo background here — Astro Cat
I'm still curious about this. If we measure interstellar distances in km and not light years, and our clock is ticking a bit slower as we advance to our destination explain how that actual distance may diminish from our perspective beyond that calculated by D=RT, thus having us arrive early? Is my question even valid in the context of relativity? — jgill
Relative to Paris, it takes light less time to go to the moon and back than the distance involved. It's really close, but light travels faster than c relative to Paris, at least along this path. This is due to spacetime not being Minkowskian between here and the moon, and not so much due to the how Paris moves during that experiment.
In the frame of Paris (the coordinate system in which Paris stays stationary), eastbound light goes slower than westbound light, so signals sent via say 20 mirrors around the world will get back to Paris quicker in one direction than the other. This is the well known Sagnac effect. — noAxioms
In the frame of Paris, a light pulse in just the right place somewhere around the orbit of Neptune will coast to a halt, then reverse and go back the way it came — noAxioms
Oh yea: In cosmological coordinates with distance measured as comoving distance, light speed (comoving distance per second) in a vacuum slows over time, approaching but never reaching a halt. But there's a distance (about 16 BLY from where it gets emitted today) beyond which it will never reach even in infinite time, so if it doesn't slow to a halt, it will surpass this limit. That's the current comoving distance to the event horizon, and if light emitted now from there can never reach us, then light from here can't reach them either.
I have a graph of such coordinates if you don't know what I'm talking about. — noAxioms
In QFT, the universe contains 'interacting' fields. Every field permeates the entire universe, yes?
So does a 'photon'/field excitation really 'travel' at all?
Like a water wave or a mexican wave in a crowd of people. Each person just undulates in sequence order. Each person just stands up and sits down at the correct time. This gives the appearance of a moving wave. If a photon can appear at any point in space or time then perhaps it does not have to travel as it is already there and has been there since the big bang singularity. The speed of light would then be an observed constant of propagation through a universal field, but the 'photon' can arrive at any point in the universe instantly as a 'photon' has always existed at every point in the universe. — universeness
..and which can explain the hypothesis of the big bang and the universe as we know it being a "bubble" in a pure energy field. Like, if infinite and there are infinite quantum possibilities that can occur in that infinite energy, it would eventually lead to the possibility of a bubble where energy fades out and then deflates back into pure energy. Since that pure energy "locally" fades and that energy is between singularities within its "bubble" (like black holes), it appears as matter, like gas crystalizing in the air. — Christoffer
Well, there seems to be a consensus among the posters regarding what happens to time at lightspeed and perhaps beyond via simple extrapolation. There are attempts to describe this state but I feel we could improve upon them if only those who have the relevant info tried ... a little harder. — Agent Smith
This cannot work. For one thing, as stated above, there is no valid 'perspective of the photon'. Secondly, if unobstructed, no photon reaches an edge of the universe. For instance, light currently emitted from a star 16 billion light years away will never reach here period after any amount of time as measured by anything. This of course cannot be true in Minkowskian flat spacetime, but spacetime isn't flat in reality.
Relative to a cosmological coordinate system (a coordinate system in which the size of the universe is not bounded), light fades to zero energy (proper distance method) or coasts to a halt (comoving distance method). Both of those are the same coordinate system with different methods of specifying distance between objects. — noAxioms
I don't know. Discover a new source of energy so efficient people can't ignore it? — khaled
I think the 2nd is much more likely, leading to the conclusion that most or all such universes support life; a conclusion that fatally undermines the so called strong anthropic principle — Devans99
the Many-Worlds Interpretation of QFT, especially with respect to QG (quantum cosmology) entails that the Planck Era universe c13.8 billion years ago in superposition (so-called) BB consisted in a countless universes each constituted by every possible physical value (i.e. ratios we designate "constants"), with this, our current "anthropic" universe just one of many possible universe; thus, the plausibility of which alone debunks the "need for" "intelligent" "fine tuning" — 180 Proof
I suggested it is scientists who we must rely on to solve the situation and we must not rely on finding and segregating a group to be the target of our anger because that will lead to no solution — god must be atheist
Why are you fighting that, and why are you trying to distort the truth, denouncing scientific work and denouncing the importance of it? — god must be atheist
So... Greta is a politician?
It is not only the politician that makes people vote one way or another. it is the scientists who have given us the facts about global warming / climate change. It is not the politicians who've given us that insight. — god must be atheist
If all the politicians were employed in political ways to reverse or stop the global warming effects, but all scientists were forbidden to work on it, (as a hypothetical situation), how far would we get to solving the problem? — god must be atheist
It is only technology and science that can solve that problem, not votes. — god must be atheist
You are missing the point, Staticphotn. We are all keep on burning, no matter which side of the sticker line we are on. It does not matter whether one gives a shit or not. If you give a shit, you keep burning the fossil fuels. If you don't give a shit you keep on burning the fossil fuels. You are blind to this?? . — god must be atheist
I have no idea why that would seem to be an explanation to them. — Terrapin Station
What would be the merit of that? It just seems like an arbitrary fantasy notion. — Terrapin Station
Hard--and maybe impossible--for me to relate to thinking that everything is an idea or that it would seem to someone like it has been created from a thought. — Terrapin Station
It is the very fact that our universe is not computable, i.e. that it is a model of the ToE which contains true facts but that are unprovable from the ToE, that determines the very nature of our universe. It is rather a multi-world system that very much looks like the religious take on heaven and hell. — alcontali
Now that you have spoken of thepossible origins of the universe, how does the idea of God come into play? — sydell
But, I wrestle with not knowng who or what that creator is,or if I am to learn something that would lead me to believe there is none. — sydell
Everything I have said about justifying evil, has not been said in context of the bad that you have spoken of, and that I have found acceptable. It has been spoken of in context of the cosmic forces of good and evil that vie for dominance in the mind. And that is an important difference to understand.
I have said that if the world gave no place for cosmic evil in the mind, then all that remains is good, and there is still ample creativity in that setting. Further to that, I said that (cosmic) good is the only reason creativity exists, and that (cosmic) evil is only a destructive force. — Serving Zion
I say that in absence of evil, all people being individuals with individual strengths, interests and experiences, together are no less able to create than if evil is to exist. I say this because creativity itself is an expression of love, which is antithetical to evil. IOW, evil is, in truth, the force that destroys. In absence of evil, therefore, is potential for everlasting life - and it's interesting when you dig into the meaning of the text in Genesis 3:24, to find out what it means to have Cherubim and a sword of fire guarding the way to the tree of life. Only because Adam had guilt, could the flaming sword sear his conscience, and only because he had fallen, could he not stand in judgement of the one who would rob him of his access to life. — Serving Zion
Yes, that is my life, precisely! — Serving Zion
My real complaint is that the bad keeps getting in the way of the good, and there is no power against it because justice is woefully absent. — Serving Zion
Not necessarily. Culture is constantly fluid. One thing we can know for sure, is that vacuum cleaners and chemical technology have (potentially) contributed the greatest advances in environmental health, by reducing presence of toxic dusts and molds in homes. On the other hand, the pollutants from vehicular transport exposes us to harmful dusts and fumes that probably life would suffer less if the clock was rolled back. And that's besides mentioning the more obvious sufferings that polution has brought to the world, the extinctions from humans pillaging the environment, mass murders, riots, man-made diseases, nuclear fallouts, indoctrinations, forced medications, politicians disregard for justice, judges revelling in their wickedness, social disdain for holiness, beggars lying for drugs, cities imprisoning homeless to prepare for sports events, radicals chopping heads off in the name of God, laws making pregnancy an alternative to working and marriage, etc.
No, the world is in a bad way, like never before, and on a global scale, and in the whole world, with the whole world aware of these things, nobody has stopped it, and the ones who would stop it if they had power, are not drawing interest from those who have the power.. in fact to the contrary they are seen as enemies because of the natural indignation that the truth is, the powers are afraid of standing in proximity to them, for fear of how they might measure up to the stature of their name in light of the truth.. — Serving Zion
I see Evil spreading in our world. We are more and more divided. We destroy one another, other species, the environment. We see love as a weakness, suffering as a strength, unsustainable growth that leads to destruction as desirable, profiting at the expense of others as a success. If that Evil keeps spreading that world will turn into a desolate wasteland, almost devoid of love, beauty, life, happiness. — leo
So, we don't know whether we are "capable of producing a model that rigorously replicates the behavior of the universe"; how could we ever know such a thing? It might seem to us that we have a model that does, but how could we know that what seems to us is real in any "absolute sense", or even what that question could mean? — Janus
Something that is thought of as being necessary is something which is simply thought of as necessarily being. So, the laws of nature might be thought of as necessary if they are either eternal or ordained by God — Janus
Sure, but in the context you seem to be considering- a "theory of everything" which is usually understood to be a theory which would unify the so-called "four fundamental forces"- the question could be asked as to whether those forces are everlasting. — Janus
I mean if we could ever explain everything, then that would entail that what we are explaining would be everlasting, no? Otherwise we would not have explained everything. — Janus
What other method could there be for understanding the universe? We can reason about human behavior and understand it in ways which are not usually thought of as being part of the scientific method, to be sure, but that kind of understanding is not usually thought of as "understanding the universe" but rather " understanding ourselves". — Janus
I would say that metaphysics does not consist in understanding the universe, but in understanding the ways in which we are able to think about things. Only the empirical method can test whether our ways of thinking can plausibly be thought to be accurately modeling the physical universe. But maybe I've misunderstood what you were aiming at? — Janus
As Popper convincingly showed, scientific theories, including those concerning "laws of nature" can never be deductively or empirically verified as either necessary or everlasting. — Janus
Then how about answering both questions as separate items? — Harry Hindu
sp. in other words could we hold all the ideas involved in an all encompassing model? I doubt it, but I think it's speculative either way — Coben
How would we ever know that we have simulated all natural phenomema?
It's a different question than asking if we could understand the model, isn't it? — Harry Hindu
If the premise had been, “can reason and logic explain that which is present to human observation or mere thought” I wouldn’t have been so quick to jump. The human cognitive system, re: reason, is a relational system, re: logical, therefore it is by means of a methodology based on reason and logic a human should ever claim to know anything at all.
I see no reason to suspect you do not accept that physical science is grounded by pure reason, at least in its theoretical domain, which all science must be at some point. Whether the laws which justify our understanding of the world inhere in the world and are merely discovered, or are rationally determined a priori in response to the affect of the world on our sensibility, is sufficient to demonstrate the absolute necessity for pure reason with respect to the human’s ultimate seeking after knowledge.
Nevertheless, in a certain sense, you are correct, insofar as nothing whatsoever a consciously interactive human ever does, excepting pure reflex or sheer accident, is not immediately preceded by the thought of it, which is the epitome of reason and logic, however rational/irrational, logical/illogical it may be. — Mww
1) So, deduction first, testing later?
2) So, we have the issue of what the mind can reason and deduce itself to in terms of conclusions. But then we also must have access to whatever we need to test direclty, physically. And we would need the technology, presumably necessary to do those tests. And we would need to know what technology to create that would aid us in those tests.
There seem to be a lot of contingent factors. And anyone saying they are sure, seems to be speculating wildly. — Coben