Dark Energy Is Not Real, New Data Analysis Finds

According to our current understanding of astrophysics, the universe is not only expanding, but also growing at an ever-increasing rate. The most-accepted model for this expansion attributes the accelerated expansion to dark energy – but what if it’s wrong? A group of astrophysicists have offered up a different explanation, which they call the “timescape” model. They claim that it fits the data better than dark energy. Let’s take a look.

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#science #sciencenews #physics #cosmology

[nicksallnow-smith]

If you prove a previous Nobel prize winner wrong do you automatically get a Nobel prize yourself?

[dadananda]

I think the explanation here missed out the main point - which is that time will run slower in regions of 'high' density (galaxies and galaxy clusters) than in regions of low density between the galaxy clusters. If this time dilation is factored into the observations for expansion of the universe, the apparent acceleration of the expansion drops out as a consequence. In other words, the acceleration is not real, it is an artifact due to the variable "timescape" nature of the universe.

[SivaranjanGoswami]

A faulty initial assumption combined with a strong mathematical model can sometimes predict and explain observations with incredible accuracy. Most ancient scholars believed in the geo-centric model. But they introduced complex concepts like epicycle and predicted planetary motions with high accuracy with their rigorous mathematical model. This is the reason why it was so hard to establish the heliocentric model.

[T_Mo]

From a video design standpoint, I appreciate how the color gradient in the blouse and sleeves matches the background gradient into the desktop, and emphasizes the hand gestures.

[edgewaterz]

"All models are wrong, but some are useful." Thank you for that! Happy New Year!

[curteaton]

I think we all knew this intuitively. Clearly dark energy is just a place holder for new science.

[lotsofstuff]

Negative pressure does exist in the universe though. My mother produced quite a lot of it when I was young. She may have been the primary source

[csdn]

Just a note, astrophysists are beginning to think that the local group (which makes up the Milkyway, Andromeda, and M-87) are actually within a void (voids are not empty, but they do have smaller amounts of galaxies within them). They think that it is this void that is causing the issues seen with the Hubble tension.

[BayLeafff]

I'm sure that stock footage of South America at 3:15 gave a few people a jolt when it zoomed right in on their location lol

[jeffreyestahl]

Back in the 1980s, I'd built a model (and subsequent paper which I could never find a publisher due to it being some 60 pages long and, in the words of one journal editor, "Too radical" back in 1991) which posited that spacetime could be lumpy. The areas of higher density (hence lumpiness) would have gravitational pulls all themselves. The downside of this approach was the realization that universal constants of physics might change over time as the universe expanded and changed. This meant the variation of energy and momentum, instead of being exactly zero, became a regional integral of a function whose limit approached zero over time. (BTW, this approach held open the possibility of breaking the Femtosecond barrier near the Big Bang) I still stand by that hypothesis, even though my Physics days are some 35 years behind me. I failed, but I'm glad to see that others have begun moving where I was initially about 45 years ago. It's good to see Astrophysics starting to break out of its dogmatic phase. I never agreed with the Dark Energy/Matter hypothesis. It always seemed overly complicated as an explanation. When theorizing about Cosmology, the simplest models should be the ones pursued.

[lucianonotarfrancesco]

I really appreciate how you avoid the sensationalist clickbaity bs, and just make a honest effort to explain a paper in 5 minutes to a general audience. Thanks. Happy new year!

[VictorJimenez-ceqy]

Fun fact, the top view of the city at 3:20 is the city of Popayan, Colombia. It made me happy to see a city of my home country in the video 😄

[Taomantom]

The best start to a new year! Thank you, Sabine, and a fortuitus New Year to you! Post Script: This is a very intriguing theory to my mind and Its New!

[kevinricherson]

In a group on Facebook, we used to discuss the fact that time doesn't move at the same rate everywhere as the effects of gravity are not evenly distributed throughout the universe.

[かみく-pj]

Just watched Anton Petrov's video on this and its pretty exciting to hear two takes on the idea, and hear even more information from it!
Also lots of visuals!

As someone who is terrified of scientific paper language, I appreciate it.

[brothermine]

It's good to see the Timescape paper & model being discussed in several Youtube channels. Hopefully it won't be ignored by mainstream cosmologists, and they will feel compelled to try to falsify it.

[arekkrolak]

Dark energy is just a way of saying: we have no clue why expansion accelerates :)

[halixol]

Oh god... finally.
I have commented on this topic on YT on 2-3 occasions more than a decade ago, as i had the same gut feeling why an accelerating expanding universe did not make sense. All the measurements assume that light and time and redshifting behaves the same way throughout the entire galaxy. My feeling was that we are in a sort of "bubble" which can distort the observations from outside of the bubble. As if you are a fish in a glass bowl, and assume that everything you observe outside the bowl behaves the same way.
Well, my perceived "bubble" can be explained in many ways, and these NZ guys nailed it :)

[Zafar]

Happy new year Dr Sabine. We follow you from Uzbekistan.

[anton]

The biggest hurdle to learning new things is when you think you know it all.