I'm very glad that binary is not in our neighborhood. Probably sterilizes everything within light years every time it flashes.
I had an idea that there has always been Dark Matter everywhere.
It made up 100% of our 'universe' until the Big Bang when Baryonic particles burst into the Dark Matter universe and coalesced into matter as we know it.
Or maybe there became just too much Dark Matter and some was ejected as Baryonic Matter since this does not interact with Dark Matter.
Until we discover actually what Dark Matter is, we will never know.
;-)
There is a word in German: "albern" - silly (children). Was Albert albern when he "bent" "space-time", "bent" coordinate systems, came up with this methodical nonsense, or did not recognize it;-?
Or does the grip of the elites even go so far back, and their do is again also marked by name, masked;-?
There is a word in German: "albern" - silly (children). Was Albert albern when he "bent" "space-time", "bent" coordinate systems, came up with this methodical nonsense, or did not recognize it;-?
Or does the grip of the elites even go so far back, and their do is again also marked by name, masked;-?
Welcome batteryman!
I'm not even sure how I want my dark matter to be served - hot, warm or cold? 😀
The "cold" in cold dark matter refers to the fact that its particles move slowly compared to the speed of light.
This is in contrast to hot dark matter which consists of particles that travel with ultrarelativistic velocities.
Apparently, the idea of hot dark matter (HDM) being the sole substance in explaining cosmic galaxy formation is no longer viable and it is necessary to include cold dark matter (CDM) and warm dark matter (WDM) under the larger umbrella of mixed dark matter (MDM)! 😱
https://en.wikipedia.org/wiki/Hot_dark_matter
What fun!
Should keep the detractors happy! 😉
Why Aren't Scientists More Skeptical Of Dark Matter?
Either scientists have got the rules wrong, and they need to be modified, or something else is at play above and beyond what they’d considered earlier.
Let's ask Ethan: https://www.forbes.com/sites/starts...ent-scientists-more-skeptical-of-dark-matter/
Either scientists have got the rules wrong, and they need to be modified, or something else is at play above and beyond what they’d considered earlier.
Let's ask Ethan: https://www.forbes.com/sites/starts...ent-scientists-more-skeptical-of-dark-matter/
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Is There Evidence for the Existence of Dark Matter?
Hubble has been observing the areas surrounding massive clusters of galaxies.
Light from more distant galaxies in the background is subject to gravitational lensing.
Below, the B1608+656 gravitational lens system which lies about five billion light-years away.
By 'reverse engineering' the bending of the light it can be shown where the densest concentrations of matter lie within the galactic clusters.
Some of the densest concentrations of mass do not lie where visible matter is observed and so may reveal the location of invisible (dark) matter within the galactic clusters.
Hubble has been observing the areas surrounding massive clusters of galaxies.
Light from more distant galaxies in the background is subject to gravitational lensing.
Below, the B1608+656 gravitational lens system which lies about five billion light-years away.
By 'reverse engineering' the bending of the light it can be shown where the densest concentrations of matter lie within the galactic clusters.
Some of the densest concentrations of mass do not lie where visible matter is observed and so may reveal the location of invisible (dark) matter within the galactic clusters.
Attachments
I tried unsuccessfully to get a discussion going on the previous science thread about how we can end up with a possible explanation for dark matter and dark energy but Galu and Steve found my postulations amusing. Let’s try again.
We always think of time as a canvas upon which events take place - it’s a naturally human view. Newton thought it was so and Einstein postulated time was an illusion. But maybe this is not what is actually happening. We calculate energy from power * time. But what if we look at this differently and think about time as an emergent property of entropy? Wherever energy is changing (think glass of hot water cooling to surrounding room temp or CMB temp dropping from initial BB conditions to now c 2.7 K), the result is it happens over time. In this view, time is being created by the dissipation of power - it’s not this blank canvas that stretches backwards and forwards. Things exist in the past because we made it so with our activities, or matter behaved in a way that left it’s mark. Things can be predicted in the future because matter obeys certain physical laws. However human endeavours less so because in general we are unpredictable (just study economics and you quickly realise ‘rational consumer’ is a misnomer). Although we may calculate the energy expended by a car moving from A-B, you could also say, by using energy,a car was moved in space (time) from A-B. So, a time difference was created by expending energy - this is just a different way of saying the car moved from point A to point B and perfectly consistent with Einstein’s space-time view.
Einstein spoke about space-time because they were two sides of the same coin and inextricably linked. If time is an emergent property of entropy in this way, it would manifest itself to us as space, or distance, which is what we see when we look at distant objects through telescopes or JWST (Of course to a photon, time doesn’t exist and the universe is actually quite small).
For dark matter, the clearest evidence is that the outer reaches of a galaxy revolve around the centre much faster than they should. Here, time is being created within the galaxy but since everything is gravitationaly bound (alert: analogy coming up here) its like water that’s swirled in a bucket. The water at the edges swirls much faster than it should because it’s constrained, and this is what’s happening with dark matter.
So, we don’t see cosmic expansion with gravitationally bound objects, and this is why the stars in the Milky Way or any other galaxy aren’t rushing away from each other - however, we do see it between gravitationally unbound bodies and an expanding cosmos.
The expansion of the universe would accelerate (as it is) because (another analogy coming up) you have this constant ‘push’ (I don’t want to use ‘force’ at this point) and just like F/M=a, a constant force acting on a body accelerates it.
If time is indeed as described, it would not contradict relativity, thermodynamics or the arrow of time hypotheses.
We still won’t have an explanation for gravity . . . To be continued 🙂
We always think of time as a canvas upon which events take place - it’s a naturally human view. Newton thought it was so and Einstein postulated time was an illusion. But maybe this is not what is actually happening. We calculate energy from power * time. But what if we look at this differently and think about time as an emergent property of entropy? Wherever energy is changing (think glass of hot water cooling to surrounding room temp or CMB temp dropping from initial BB conditions to now c 2.7 K), the result is it happens over time. In this view, time is being created by the dissipation of power - it’s not this blank canvas that stretches backwards and forwards. Things exist in the past because we made it so with our activities, or matter behaved in a way that left it’s mark. Things can be predicted in the future because matter obeys certain physical laws. However human endeavours less so because in general we are unpredictable (just study economics and you quickly realise ‘rational consumer’ is a misnomer). Although we may calculate the energy expended by a car moving from A-B, you could also say, by using energy,a car was moved in space (time) from A-B. So, a time difference was created by expending energy - this is just a different way of saying the car moved from point A to point B and perfectly consistent with Einstein’s space-time view.
Einstein spoke about space-time because they were two sides of the same coin and inextricably linked. If time is an emergent property of entropy in this way, it would manifest itself to us as space, or distance, which is what we see when we look at distant objects through telescopes or JWST (Of course to a photon, time doesn’t exist and the universe is actually quite small).
For dark matter, the clearest evidence is that the outer reaches of a galaxy revolve around the centre much faster than they should. Here, time is being created within the galaxy but since everything is gravitationaly bound (alert: analogy coming up here) its like water that’s swirled in a bucket. The water at the edges swirls much faster than it should because it’s constrained, and this is what’s happening with dark matter.
So, we don’t see cosmic expansion with gravitationally bound objects, and this is why the stars in the Milky Way or any other galaxy aren’t rushing away from each other - however, we do see it between gravitationally unbound bodies and an expanding cosmos.
The expansion of the universe would accelerate (as it is) because (another analogy coming up) you have this constant ‘push’ (I don’t want to use ‘force’ at this point) and just like F/M=a, a constant force acting on a body accelerates it.
If time is indeed as described, it would not contradict relativity, thermodynamics or the arrow of time hypotheses.
We still won’t have an explanation for gravity . . . To be continued 🙂
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Unless we find out why the outer galaxy moves at same rate as inner galaxy we are in dark. No pun intended. May be due to near singularity black hole create even gravity across certain distance and the gravity does not change with distance square
It's nice to have you back in the fold, Bonsai. I remember our long discussions well.
It's not that I find your postulations amusing, it's just that they're a little too cerebral for me! 🤓
Time as an emergent property of entropy?
I've written before that it can be argued that time is an illusion which emerges only in a thermodynamic context.
I can do no better than quote the words of Carlo Rovelli, the Italian theoretical physicist and founder of loop quantum gravity theory.
I see that The 1975 are scheduled to play during the final day of the TRNSMT festival from Glasgow Green.
There's highlights coverage on BBC Scotland tomorrow (Sunday) from 9 pm till midnight.
I wish I was 50 years younger!
Did anyone notice the saltires in the background? 😉
Are all the girls in Scotland good-looking? 🙂
Anyway, I still don't totally get Bonsai's theory about Time being emergent and all that. But seems better than Electric Universe theories.
And aren't many useful Physical Conservation Laws, time-reversable by nature?
I have gleaned an equation for Black Hole Entropy based on surface area A and some other familiar constants:
https://en.wikipedia.org/wiki/Black_hole_thermodynamics
The reduced Planck's Constant makes it a bit Quantum IMO. Seems simple enough anyway. Lp is the Planck length which is very small indeed, IIRC.
Anyway, I still don't totally get Bonsai's theory about Time being emergent and all that. But seems better than Electric Universe theories.
And aren't many useful Physical Conservation Laws, time-reversable by nature?
I have gleaned an equation for Black Hole Entropy based on surface area A and some other familiar constants:
https://en.wikipedia.org/wiki/Black_hole_thermodynamics
The reduced Planck's Constant makes it a bit Quantum IMO. Seems simple enough anyway. Lp is the Planck length which is very small indeed, IIRC.
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Well I’m not disagreeing with him on that specific point, just on how time is viewed. Rovelli also thinks about time as a continuum going from the past to the future. I am postulating it arises from energy changes so it’s something that is produced, not something at its deepest level that exists on its own as a blank canvas. We don’t see it in gravitationally bound systems, but it’s still happening. For we humans it’s profoundly locked up in our world view and it makes perfect sense to think about time the way we do as we go about our daily business. Who’d have thought before Einstein that time could dilate or that it’s passage was not at a fixed rate?
This view of course will raise the question ‘what then is entropy and why does heat flow from hot to cold?’ Fair enough, what you get with the one hand etc etc. another layer to peel off the onion.
(Unfortunately loop quantum gravity does have it detractors and they are serious physicists in their own right - it leaves some questions unanswered. That doesn’t detract of course from Rovelli’s undoubted brilliance 🙂).
Only the good-looking ones get photographed! 😉
The 1975 will be available soon: https://www.bbc.co.uk/programmes/p0fxqlvf
Very small indeed!
If you measured the diameter of an atom in Planck lengths, and you counted off one Planck length each second, it would take you 10,000,000 times the current age of the universe!