Lazytown Classroom

[chuft]

Pretty much mirrors the video that's 3 posts above your post with the tiny milky way in the vast void preview image

No, it doesn't at all. It's a brand new paper with a new theory that is neither LCDM nor MOND. Read the article. It's about time passing at different speeds in empty areas than in matter dense areas. What was perceived as acceleration is actually just more time passing, and things moving farther apart over that time, in low gravity areas like voids because time runs faster there.


An excerpt:


One of the biggest mysteries in science—dark energy—doesn't actually exist, according to researchers looking to solve the riddle of how the universe is expanding.

Their analysis has been published in the journal Monthly Notices of the Royal Astronomical Society Letters.

For the past 100 years, physicists have generally assumed that the cosmos is growing equally in all directions. They employed the concept of dark energy as a placeholder to explain unknown physics they couldn't understand, but the contentious theory has always had its problems.

Now a team of physicists and astronomers at the university of Canterbury in Christchurch, New Zealand are challenging the status quo, using improved analysis of supernovae light curves to show that the universe is expanding in a more varied, "lumpier" way.

The new evidence supports the "timescape" model of cosmic expansion, which doesn't have a need for dark energy because the differences in stretching light aren't the result of an accelerating universe but instead a consequence of how we calibrate time and distance.

It takes into account that gravity slows time, so an ideal clock in empty space ticks faster than inside a galaxy.

The model suggests that a clock in the Milky Way would be about 35 percent slower than the same one at an average position in large cosmic voids, meaning billions more years would have passed in voids. This would in turn allow more expansion of space, making it seem like the expansion is getting faster when such vast empty voids grow to dominate the universe.

Professor David Wiltshire, who led the study, said, "Our findings show that we do not need dark energy to explain why the universe appears to expand at an accelerating rate.

"Dark energy is a misidentification of variations in the kinetic energy of expansion, which is not uniform in a universe as lumpy as the one we actually live in."

[chuft]

Seems odd that company would expose login interfaces on the WAN side, especially with a preset password. Normally you only expose login interfaces on the LAN side, other than offering a VPN connection with a login for that.

I think the main concern with TP-LINK is that the Chinese government has access to the company.

[chuft]

I bet a lot of the James Bond stuff today goes on at router factories. If you can get access to routers in the factory/the manufacturing process, you can put hardware (not just firmware) backdoors on the boards. I think China was caught doing that a year or two ago.

[LazyPooky]

The new evidence supports the "timescape" model of cosmic expansion, which doesn't have a need for dark energy because the differences in stretching light aren't the result of an accelerating universe but instead a consequence of how we calibrate time and distance.

It takes into account that gravity slows time, so an ideal clock in empty space ticks faster than inside a galaxy.

Isn't this just how the formule works.

speed = m/s(t)

If you want to explain why a distance is longer (in empty space), make the time smaller (faster time) and the speed increases.
Or inside a galaxy the distance is shorter, so make the time larger (slower time) and the speed decreases.

So time is the variable. But why? Only because of gravity?

[boredjedi]

No, it doesn't at all. It's a brand new paper with a new theory that is neither LCDM nor MOND. Read the article. It's about time passing at different speeds in empty areas than in matter dense areas. What was perceived as acceleration is actually just more time passing, and things moving farther apart over that time, in low gravity areas like voids because time runs faster there.

Omg I got blue screened in the middle of typing this It. doesn't do it as much with the 24H2 update but it still happens every now and again.

I had read it and came away with Timescape being just an offshoot of MOND. Neither needs Dark Matter and Dark Energy.

From the article: "It takes into account that gravity slows time, so an ideal clock in empty space ticks faster than inside a galaxy."

That's how I always thought of it. And what I took away from that video. It's all pretty much covered in that video.
Matter, gravity, time and speed. High gravity greatly slows time. Low gravity does slow time but not as much.
No gravity time would pass unaffected. Meaning the baseline for time. Even in these voids, there is effects of gravity. Either from the local
galaxies residing in the void and gravitational influences from matter outside the void. All of it though still depends on our understanding
of gravity.

[boredjedi]

I bet a lot of the James Bond stuff today goes on at router factories. If you can get access to routers in the factory/the manufacturing process, you can put hardware (not just firmware) backdoors on the boards. I think China was caught doing that a year or two ago.

That's a definite. Started after 2009 with CPUs. That Intel Management Engine issues. AMD joined in too
AMD Secure Technology (formally called Platform Security Processor) after 2013 .
But I'm sure there's stuff nobody has discovered yet. I remember gloating about my
AMD chip from 2009 was clean of that public dubious backdoor stuff. Now
with the new AMD CPU I'm snooped on no doubt. Besides the Windows snooping.

In the immortal words of Weird Al "Be aware: There's always someone that's watching you."

Wait thought there was a spy Steph emoji image.

[boredjedi]

Christmas Minerals 🎄

[chuft]

Isn't this just how the formule works.

speed = m/s(t)

If you want to explain why a distance is longer (in empty space), make the time smaller (faster time) and the speed increases.
Or inside a galaxy the distance is shorter, so make the time larger (slower time) and the speed decreases.

So time is the variable. But why? Only because of gravity?

Yes. Time moves slower in a gravitational field. Even on Earth this is an engineering problem because satellites in orbit - like GPS satellites - have to keep precise time and be in sync with the ground, but time passes more slowly on Earth's surface than it does in orbit, because the surface is deeper in the gravity well. Adjustments have to constantly be made because time is passing faster in orbit and the satellite clocks run faster than clocks on Earth.

Acceleration is similar. Say you have a guy on a space station and a guy in a rocket ship. The ship flies away then later flies back. One of the two guys will be older when the ship gets back. Now in Einsteinian physics we have relativity, you can view the ship as standing still and the station moving away, or you can view the station standing still and the ship moving away. Both are valid and it just depends on the observer's point of view.

But the fact is one guy is younger after all this. And it will be the guy on the rocket. The reason is because he is the one who really moved away. How can you tell? He experienced acceleration. As things speed up they become more massive, gravity increases and time slows down. He aged less during the trip because he accelerated away, then accelerated in the other direction (decelerated) to stop, then accelerated back towards the station, then accelerated away (to slow down) in other direction to stop at the station.

He felt the acceleration (like you do when in a car and you speed up and are pulled back into the seat) and instruments would measure it as force just like gravity. Inside a spaceship with no windows you can't tell whether a force you are feeling is gravity or acceleration. There is no difference.

This slowing down of time due to acceleration and increase in mass is why you will sometimes read about the idea of someone traveling close to the speed of light on a long trip and coming home only to find hundreds of years have passed on Earth but only a few days or months for the person on the ship.

But yes the paper is saying that due to the increased mass in areas of the universe that have stars, time runs slower there, while in the great voids, time moves much faster. Therefore the expansion has more time to go on and things look farther away than they should from the point of view of the mass rich area. For someone on Earth 8 months might go by while 12 months has gone by in the void. This gives an extra four months in the voids during which moving objects move further. To us it looks like they are moving really fast, but they aren't, they just get more time to move in.

[chuft]

Omg I got blue screened in the middle of typing this It.

Your computer knew it was wrong.

I had read it and came away with Timescape being just an offshoot of MOND. Neither needs Dark Matter and Dark Energy.

No, MOND changes the laws of gravity to account for observed phenomena on the edges of galaxies being different than expected. This paper isn't requiring a change to the laws. It is saying the time difference explains why stuff in matter poor areas seems to be moving faster than in matter rich areas.

From the article: "It takes into account that gravity slows time, so an ideal clock in empty space ticks faster than inside a galaxy."

That's how I always thought of it. And what I took away from that video. It's all pretty much covered in that video.

I can't tell you how you always thought of it, but I watched the entire video and it definitely does not say anything about time explaining the observations. Which is not surprising because this is a major new paper by a group of astrophysicists, and that is a month old video by who knows who. This is a major challenge to LCDM and the idea of dark energy, saying the current laws of physics explain the observed phenomena without requiring the "law of gravity change" of MOND.

Matter, gravity, time and speed. High gravity greatly slows time. Low gravity does slow time but not as much.
No gravity time would pass unaffected. Meaning the baseline for time. Even in these voids, there is effects of gravity. Either from the local
galaxies residing in the void and gravitational influences from matter outside the void. All of it though still depends on our understanding
of gravity.

The video does not say that the apparent acceleration of the universe expansion is actually just due to time passing faster in some regions than others due to differences in mass. That is what makes the paper so important.

[boredjedi]

The video does not say that the apparent acceleration of the universe expansion is actually just due to time passing faster in some regions than others due to differences in mass. That is what makes the paper so important.

Yeah I got that. Maybe I was reading more into that video than there was or
there was another video I watched that involved time, mass the usual.
Not the same as that paper but on the same theme.

When I read that paper, it sounded all so familiar. Local differences in time and gravity/mass etc..
Even the Earth doesn't have uniform gravity due to clumpy matter which would affect time imperceivable to us
but is measurable with the equipment they have nowadays. Even the tippy top of the atmosphere
at the space boundary is not uniform. I can imaging then that the boundary of the universe is not uniform either.
Clumpy. Assuming there is a boundary. Time will tell which model is right LCDM, MOND and now
Timescape (assuming it holds up to further independent observations). The battle continues.

Bottom line to all this is that we all have to keep adjusting our clocks

[boredjedi]

There seems to be only one video on youtube about this posted 3 days ago
Wonder if I had come across this when I was falling asleep on the smart TV.


Dr. Ryan Ridden. He's listed on the published paper "Ryan Ridden-Harper"

6:30 "I've been working with the creator of the timescape model Professor David Wiltshire
and two Phd Students Zach Lane and Antonia Seifert to test this question with supernova"

[chuft]

Dark energy always struck me as a kludge when observations didn't match their model, they just invented something to explain it. Something undetectable and thus unfalsifiable. Unfalsifiable things are generally bad theories.


Some imperial British dude with a pith helmet calculated the mass of Mount Everest around 1910 by using a plumb-bob and seeing how far it was pulled sideways off the vertical (by Everest's gravity) when he suspended it in the vicinity of Everest.

[boredjedi]

Yeah I never understood it myself. I'm just an innocent bystander catching all the info.
I do admit that the timey wimey stuff as a whole is trippy. Just how say one being
can be residing in a higher mass density slower time region the perception would
be for every 1 year that passes for it the time here would be 10 years have passed.
As an example. Like the Black Hole event horizons and time slowing.

Then add to that, which I haven't touched upon yet, the time perception of an organism's metabolic rate.
The reason time passes slower when we are young and have a higher metabolic rate and as we get old
time just goes by like a snap of finger as metabolic rate slows.

Makes the brain just wanna explode sometimes

You know I don't remember if I knew that our system
resides in a local hot bubble. This Nasa news

Interstellar Tunnels Found Connecting Our Solar System to Other Star Systems
They just happened to drop that bit of information about the bubble before
touching on the tunnels.

Voids and Bubbles

[chuft]

Don't be fooled by the channel name. It's pure bullshit.

"Welcome to NASA Space News, your daily premier source for space exploration, innovation, and astronomy news and updates. We are an independent American news agency that covers the latest discoveries, missions, and events in the field of space science and technology. We are not affiliated with NASA or any other space agency"

One reason I read, rather than watch videos, is because I know who wrote it, when they published it, where it was published, which publication editorial board peer reviewed it, and what data and citations back up what they are saying. Who is narrating that video? Who wrote the script? Where are the citations to back up what they are saying?

I am very skeptical of any "pop science" stuff on the internet coming from people I have never heard of, not affiliated with any academic organization. There are tons of videos out there with people saying whatever they think will get them clicks and money, or just crazy nonsense they make up, and no peer review or other process to ensure what they are saying is accurate.

I could watch videos like this, but at the end, I am left wondering how much they just made up out of thin air, and I realize it's a waste of time.

[boredjedi]

The information is legit for both the Local Hot Bubble and Tunnels

Aims. We aim to extract spatial and spectral information from each constituent of the SXRB in the western Galactic hemisphere, focusing on the local hot bubble (LHB).

"we found tunnels of dust cavities filled with hot plasma, potentially forming a wider network of hot interstellar medium."

https://www.aanda.org/articles/aa/fu...a39313-20.html

Space can surprise even those who spend their lives studying it. People often think of our solar system as just a few planets and a bunch of empty space.

Yet new observations suggest we have been living inside a hot, less dense region, and that there may even be a strange cosmic channel connecting us to distant stars.

After years of careful mapping, a new analysis reveals what appears to be a channel of hot, low-density plasma stretching out from our solar system toward distant constellations.

Astronomers from the Max Planck Institute recently confirmed it using data from the eRosita instrument. Dr. L. L. Sala, lead researcher, and colleagues shared these findings in a paper published in the journal Astronomy & Astrophysics.

https://www.earth.com/news/interstel...o-other-stars/

More articles on it


Bubble - https://www.space.com/milky-way-hot-...ble-supernovas

Tunnel - https://www.techexplorist.com/new-in...-bubble/92494/

EDIT: Ugh forgot to add that the video has the link in their description for the Astronomy & Astrophysics article link I posted below as well.