DESI results: The first cracks in cosmology?
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- Опубликовано: 22 авг 2024
- Hi Spacecats, I'm Dr Maggie Lieu and welcome to my channel, where you can find all things space, astronomy and physics!
Links:
Desi results: arxiv.org/pdf/...
Validating on synthetic data arxiv.org/pdf/...
Desi sample: arxiv.org/pdf/...
Yin arxiv.org/abs/...
Media credits:
Lambda CDM simulation: Hartlap
Universe distribution: NASA GSFC
DESI’s three-dimensional “CT scan” of the Universe [TS9zVhIGuCI] = D. Schlegel/Berkeley Lab using data from DESI
M87 ESO
DESI LSS: Claire Lamman/DESI collaboration
Galaxies: SDSS berkley lab
Maisie's galaxy (LRG): NASA / STScI / CEERS / TACC / University of Texas at Austin / Finkelstein / Bagley
M33 (ELG): DESI Collaboration; Legacy Surveys; NASA/JPL-Caltech/UCLA; NSF's National Optical-Infrared Astronomy Research Laboratory
DESI robot singular: Joseph Silber/DESI
DESI robot simulation: Joseph Silber/DESI
Multiple video/images: DESI Collaboration
SDSS/DESI comparison: David J. Schlegel (Berkeley Lab using data from DESI) Acknowledgment: M. Zamani (NSF's NOIRLab)
BAO imprint: NASA/GSFC
BAO bump: NASA/GSFC
matter distribution cubes: NASA’s Goddard Space Flight Center/F. Reddy and Z. Zhai, Y. Wang (IPAC) and A. Benson (Carnegie Observatories)
Hubble tension: D’arcy Kenworthy
Unless stated otherwise, plots are from DESI cosmology paper (link above)
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I truly live in an embarrassment of knowledge and facts. Thank you for making some of it approachable.
You probably know a lot more than most of the world 🥰
Fascinating as ever and a great deal to think about!
Thank you 😇
I love how clearly and efficiently you explain the inforanation, such that an interested lay person can understand, but without dumbing it down too much. My new favorite astronomy channel!
I just imagined you saving the Universe with your mention of the 5th Element. One of my favorite movies, and you can Star in it with an alternate quintessence storyline as an astrophysicist astronaut protagonist. You can incorporate your new music theme at the beginning of your movie.🍿🤣 What color hair? Light Blue, Bluish-Silver for Sly……🥹 or ? Pleasant dreams.💭🥰
Im working on it 😊 i also used to have every colour hair - silver was my favourite 🙃
@@SpaceMog I hope you have a multi pass..
Thank you so much. I learned a lot. Here are some things for you to consider:
X. DEFINITIONS
MATTER: That which has mass, consists of the curvature of space-time and has an element of motion.
While the current definition of space in its simplest form customarily is: "a boundless three-dimensional extent in which objects and events occur and have relative position and direction" As can be seen, since we have redefined Matter in the context of the curvature of space-time, we must also redefine "Space" as well, herein and as best I can, as follows:
SPACE: That three dimensional extent in which objects and their events occur, wherein those objects of Matter are they themselves curved space-time, wherein the aforementioned space consists of and emerges via the unfolding of that Matter into various volumes and densities of Space by way of opportunistic rates of motion of Matter.
In it's simpler form:
SPACE: Unfolded Matter, emergent from rates of motion.
That's it and if I come up with a better definition or if someone else would like a try in the context of CIG Theory, please have a go at it. In this manner, a particle can become spatial and go through both slits in the double slit experiment.
CIG has redefined Matter and Space
Hi Dr Maggie, you seem to really understand your audience and get the learning curve just right.
Great channel! I just discovered it, and subscribed
Hi good to have you here 🥰
Thanks Dr Maggie Lieu for the great video on DESI and explaining the tension in the Lamda CDM model. 😊
Thank you for your support as always 🥰
I thought that if Dark Energy was not constant, it was going to be accelerating. If this is true, it is going to be the crunch and not the rip. Amazing. Thanks for the video!
The Universe is expanding at an accelerating rate. The cause of this is believed to be dark energy with a constant negative pressure. DESI results think that this is not actually constant... its getting weaker. Thanks for watching 🥰
@@SpaceMog So, does it mean that the dark energy gets diluted, hence not a direct property of the space itself? That would be a profound clue indeed. Thank you for your work.
Let's go! The robot fiber optic holder is so cool.
I love learning so much exciting stuff from you. I wonder if the dark energy problem will ever be solved as satisfyingly as the ultraviolet catastrophe was solved a century ago. I imagine it would be some surprising brilliant discovery like it was then.
It will be a big breakthrough when it is solved :)
Hearing about the bot tech of DESI 🤯 thanks for this timely and informative video Dr Maggie 👍
My friend is the operator of the camera... i was trying to get him to send me the video of it pumping crazily but he didnt get it to me in time 🥲 but that was the moment that made me perk up to this amazing instrument 🥰
@@SpaceMog not easy but you managed to get the point across just fine 👏❤️
Thanks so much for creating and sharing this educational and entertaining video. Keep it up! 😻
I’ll have to study this interesting video, especially, since you mentioned the Big Crunch at the end. I’ll have to come back and add questions later, since I’ve got nothing at the moment.😅 Besides, you’ve had a long day already finishing this video.💖
You finished that soo quickly! There's a lot to process for sure 😅 With being in the lab every day, I wasnt sure I would even get today's video out, but glad you appreciate all this work :-) hope you have a great day - bed for me now :-)
I know I can be exhausting asking sooo many questions. I decided you deserve a break from me at least for tonight.😇 And, you know, your worm experiments have me fascinated too today with sooo many questions already!🤪 Sorry… you’re just tooo magicnetically attractive.🥲😻
Thank you for explaining the math. You really hit the detail amount spot on. And what a cool result.
Thanks!
Aww thank you! 😊
Thank you! Great info.
That little song is good.
Please have your people contact Dr. Tyson, we need you on Startalk!
*Looks around* - still just me 🤷♀️ :-)
Lol. Funny, smart and beautiful. Why isn't there a ring on your finger?
With further study of this baryonic acoustic oscillation should discourage proponents of lambda CDM using a "big bang", "black holes" and "dark energy" in association with the beginning or intrinsic nature of the universe because a "big ring" or "big echo" fits too well with the science of this universal "quientessence".
4 more years of data to go - and even better when done from space with Euclid :-)
Hi Dr. Lieu, great video! I've been very interested in the idea that the cosmological constant could be variable. Is there any discussion on whether it could vary not only through time or scale factor, but directionally? I ask because the 2021 and 2022 studies from Nathan Secrest et al show an unexpected anisotropic dipole level at sigmas 4.9 and 5.1. Love the background btw!
Hi Jordan, great question. I made a video on the axis of evil a while back, not sure if you've seen that one yet, but looking for anisotropy particular in the CMB is a big thing. It's not expected, and its important for any evidence to rule out other systematics, but if there is any, its small. If you search anisotropic cosmological models, you'll find so many examples of such theories e.g. Bianchi cosmologies. Thank you!
It's always struck me as strange on the face of it, that we can be confident that 95% of the universe is some unknown 'stuff' that no theory preditcted and that we cannot directly observe or detect and can only wildly guess at what it might be. But we're confident it exists lol....
As a retired STEM scientist (Applied Mathematics and Statistics) among other things, having the popularizers of science so strongly sell as real/true for so long to constantly be wrong is making scientists to start to be treated no different than priests arguing about how may angels can fit on the head of a pin. I wonder if _Idiocracy_ happens with a bang (all at once) or a whimper, e.g., _The Reproducibility Crisis_ also on ytube.
*sigh* its frustrating
@@SpaceMog Just be careful. I'm retired so I have nothing to attack, but you're still working. If you did watch Sabine's Hossenfelder's interview about scientific fraud (the ability to reproduce modern studies has dramatically decreased almost to ZERO) is kinda ok, because "everyone does it," I wonder if you were as horrified as I watching them say and agree, meh, no biggie.
I was like WUT!? The Scientific Method is the only thing we humans have as a defense against "anything goes..." but we don't need to use it all the time... 🤕
I now can no longer even link ytube videos in my comments otherwise I would have... they get immediately censored these days.
Stay safe.
I miss Final Space!
🚀
Cosmological lambs, ok I get it now, I thought that upside down v looked suspicious
Greeks hey! 😅
If there is an uncertain fog, hey queries here is the SPACE MOG!. Her I found real researched facts, thank you for enlighten us with your knowledge. Dr Lieu if you don't mind then please make videos on other topics such as Inside earth, light is liar, dimensions and so on as the way of your explanation is too good I like your videos. In the case of queries about how to do? please ask, I would answer your queries.
- Yours SPACECAT🥰
Illustrations of the BAO are always shown as expanding rings. Is the actual BAO expanding in 3 dimensions (hollow spheres)?
Correct!
In this episode of our universe I’m just gonna say MIAUU and try to process what I don’t understand 🙂🙃🙂🧸😼😽but thanks anyway Ms/Mrs/Dr Lieu
😬 watch on repeat 🙃🫠
This video was completely on point and with the observations of recent paper where black holes are emitting non baryonic matter it is safe to assume that we could be being fooled by an illusion of accelerating expansion past the speed of light which makes a lot more sense then a universe accelerating in expansion past the speed of light... maybe they will give you the nobel prize and you will be my wife💯💚💜😉
Thank you 😊 you would have to win a Nobel prize too if we are to have an equal relationship 😜
@@SpaceMog I'm not allowed to win Nobel prizes... I would have at least three by now otherwise lol... You can have the glory... as long as im with you i wouldn't mind it...💯
Tried to understand but my mind is too cluttered with jumbled memories to make sense of what you've explained to well.
Breathe deep the gathering...
If I understand it correctly, DESI data is saying dark energy (lambda) dilutes with time ? might it be related to entropy ?
Correct, but i dont see how that relates to entropy...
The mystery of dark energy will be solved someday. Until then, it's like magic.
🤞🏻
I love your channel play but science makes my head hurt. Keep up the great work and I will try harder to understand the complexities.cheers❤
As a Space Cat in training, I, too, second your comment. I love exploring what Dr Maggie Lieu is passionate and knowledgeable about. There is so much to explore. With that said/typed, I do get reminded of the fact that I may have not been as attentive to the physics/maths professors during my time in school. 😊
Sorry! Its hard to get the balance right without making a super long video, this is already on the longer side for me 😅 but ill try harder!
@@SpaceMog Oh? Please! I do not mind the challenge and that there is always enough for us ummm non-brainiacs to explore and to enjoy exploring. Certainly I speak for many when sharing a huge thank you for sharing your ideas and passions. Wishing to you and to all Space Cats a wonderful Spring (a wonderful Autumn for you Southern hemisphere Space Cats) and more. 🌺
❤
Quick make more stuff up
How are nearer luminous red galaxies "dead", but older emission line galaxies at farther redshifts are alive and active with new star formation? Shouldn't galaxies that are nearer be younger and more active than galaxies that are farther away?
Could the cosmic tension just be another aspect of the Higgs field
I didn't know 4bn ly was nearby. What kinda vehicle you got?
Does this mean that our Big Bang was someone else's ending Big Crunch?
What's behind the CMB?
Could your DESI data confirm that the stellar entities that are releasing the most ENERGY are also the entities that have the greatest RED SHIFT? Normalized one to the other to an even spatial background field (i.e. isolated and corrected to remove RED SHIFT expansions from other foreground and background "OTHER RED SHIFTS", such that one is only seeing the Red Shift of that specific stellar entity alone. And that the isolated RED SHIFT correlates to the greatest energy release (released from the entity into Space, not contained and not released) (actually not into Space but a creation of Matter to Space) is proportional to the greatest expansion.
And this correlates to an expansion (creation of Space from Matter) ENERGY to SPACE based on ENERGY. And does this align in any way with the CUPI as calculated in the book "I Have Become Space" ? In other words, please use your data to confirm CIG Theory. It's right there. CIG Theory is the fundamental explanation for the data you are seeing. Please investigate. In CIG Theory, E=MC2 interprets "E" as new Volumes (SPACE ITSELF). Thank you kindly. Excellent - thank you so so much.
Maybe, and a theoretical maybe at that, with of curse CIG Theory in mind, and to further vindicate Halton Arp, and with the Cosmological Non-constant in mind, and to offer that Albert E. has gotten a final word over Neil's B., the following could be considered: According to CIG Theory, the most Dark Energy will be created at a time when the most Energy (light motion of matter) is being released, actually the creation of Space from Matter (not Space from Space as is the current discussions among Cosmologists).
So, a slowing over time of Dark Energy will be evident when that light in the Universe has already become Space and as such there is little light leftover to become more Space. This will be gradual. I am trying to explain in the context of CIG Theory why you are seeing the slowing promulgation, the weakening of Dark Energy over time, since there is less light Matter to turn into Dark Energy (Space). In the EMS the Dark Energy wavelength will be very very long, shorter for Dark Matter, still shorter for Visible Light, and shortest for Black Holes, the full curvature of Spacetime. Please look at CIG Theory in the context of DESI team findings of a weaker Dark Energy, of Dr. Mariangela Lisanti's Dark Matter waves, of Halton Arp's Red Shift Anomalies, of the Measurement Problem, and of the Vacuum Catastrophe.
So, the greatest expansion (Hubble Non-Constant) will take place when there exists the most light in the Universe and when there is no light left, the expansion of Space will stop. The Hubble Tension can be explained away as in the early Universe there existed a propensity for less light to escape and become the long long longest wavelength Dark Energy. Then at a later time, the light was much more pronounced, and the fast moving matter unfolded to become the Dark Energy. That Energy is weakening as the light fades.
Love and Science Hashtag STAN StringTheoryinANutshell {\} ;x
Good one! Thanks!
There is no dark energy. There is only one reason to postulate it, to explain the exponential expansion rate of the universe. The expansion was discovered in 1929. The concept of dark energy became mainstream after it was discovered that the expansion is accelerating in 1998.
If something accelerates at a constant rate it will get faster and faster. If a ship travels at a constant 1g acceleration rate it would achieve about 95% light speed in 1 year.
Electricity is drawn towards potential and the universe as a whole behaves the same way. Electricity comes into our homes because the neutral circuit provides the potential. It's drawn towards grounding rods for the same reason.
Physicists in the last century did not postulate dark energy because they understood that the expansion is a fundamental property of the universe. The fact that the expansion is accelerating does not invalidate their reasoning. It's what the known laws of physics would predict provided gravitational forces are not strong enough to counteract the process.
All studies to find dark energy have been fruitless because it doesn't exist. To say there is dark energy is to say there is 5 fundamental forces, there is 4
Gravity by itself would slow the expansion of the universe. It was a shock when in the late 90's expansion was found to be accelerating.
@@craigtevis1241 If something accelerates at a constant rate it will get faster and faster.
@shawns0762 If something accelerates there must be some force in action. Dark energy is the placeholder for that force.
Im not a huge fan of dark energy either 😅
Our lights would not come on if the neutral circuit didn't provide the potential to draw the electricity. We don't postulate some force driving the electrons and we should not postulate some force driving the expansion. Planck, Einstein, Bohr, Schrodinger, Dirac, Heisenberg, Feynman and every other physicist before 1998 didn't believe in it for the reasons I stated
Girl, you’re my new hero. Keep it up. Love your videos!
Cheers!!
😮
Cosmology has been a fantasty for the last 100 years and fewer clues existed before. The Nobel Prize in Physics in 1971 was awarded to Dennis Gabor for his invention and development of holographic methods. Over 50 years, we've known that what we are looking at it space, is not locally real. When you are studying, what is essentially dead light that left stars billions of years ago, what was there, is no longer there, all you are really studying is light. Not the Universe itself.
They very much do have dark energy wrong And won't listen to reason. It's literally the Æther under a new label
💋
Dr Mog's presentation clearly illustrates the awful predicament of modern cosmologists, astrophysicists et al: clueless
dofuss's grappling to untangle the mysteries of dark this and that - concepts which they themselves have created!
Let them all retire I say: abandon their grants and chairs and slink back into the shadows of ancient mystics!
Thanks for the video! Can't wait to see what DESI does in the future.
Thanks for watching 💗
Cosmology isn't broken. Our understanding of cosmology is broken.
60% dark energy, 30% dark matter, 10% visible matter. That's my estimate.
😻