This makes me so happy. It's an idea I had maybe 15 years ago. But I was a bartender, so everyone just threw plastic cups at me. Now who's laughing you old drunks?!?!
I know I don't often comment Anton, but you and your channel are, to me at least, the very reason why YouTube should exist; you break down complex topics so well and you really widen your audiences understanding and appreciation of all the wonderful science that is otherwise going largely ignored in media. Thank you, and your family, for providing us with such a gift.
A potentially really elegant solution. No exotic or new physics needed, just what we already understand applied with a finer detail. I like it! Looking forwards to hearing how this idea stands up against the new data to come.
I’ve always thought this. The missing dark energy idea always seemed like a cop out due to lack of full understanding. I had no idea it was seriously being studied, thanks for the information!
This is so wild to me. Im not a smart guy at all in terms of math or physics but when i first learned about the accelerating universe and the tension years ago i jokingly thought, "well maybe were just seeing the effects of time dilation on a cosmic scale due to galaxies clusters and gravity". Never once crossed my mind that the idea could have any merit.
There is an episode of Star Trek TNG called "timescape" where time moves differently at different points in space. In the show it's because technobable caused by a ship which used an artificial singularity as an energy source broke and shattered time in that area of space. They realised that the Enterprise was exploding in slow motion and were able to technobable time into going backwards and then preventing the shattering of spacetime in the first (or second) place.
This is really surprising to me. Not this idea, but the fact that it's new. Based on the bits and pieces I know about cosmology, I guess I just always assumed this sort of time dilation effect was already incorporated into existing models/theories and dark energy was still needed on top of it. It just always seemed so obvious to me as an outside observer to the field. Like I assumed surely they already considered it before resorting to positing the existence of some unknown dark energy.
As a physics teacher I am looking forward to some student questions when I next discuss dark energy. The wonderful thing about Timescape is it was hiding in plain sight, we just had to apply the General Theory of Relativity correctly. Instead we came up with an unsatisfactory plaster that is fraying around the sides and we added it to the curriculum! I love science!!
Existence is just lag. 8 minutes waiting on the sun, 24 hours waiting on the day, 365 days waiting for a new year, centuries of progress, millennia of evolution, eons of momentum, to lose the moment to the second hand. Happy new year Anton you wonderful person. To reaching for the stars and grabbing the moment.
This is a really clever idea. We have to see how well it fits observational data but if it does, not only dark energy would become unnecessary but may be even the Hubble tension would be gone (but at this moment, I do not even know if the idea changes the Hubble constant in the correct direction).
It came as a bit of a surprise that time dilation wasn’t already accounted for. I actually thought about it but more in the context of inflation. In the early universe you could imagine that small inhomogeneities would cause rabbit expansion that may appear even faster due to steep gradients in time dilation. Well cool stuff. Happy new year 🎉
The most interesting story I've heard this year, Anton, and well explained too. I've often wondered if the universe we observe isn't warped and twisted by gravitational lensing and time delay. Thanks and season's Greetings too.
Yes I thought of this as well! I kept calling it my fishbowl theory. Like you're looking at the rest of space through your own time dilated fishbowl. And you're looking through other fish bowls etc. brilliant! So glad you covered this! Excited to hear more about this
-So, what's the age of the universe? -It depends where.
The great revolution in astronomy of our lives will be replacing "there must be a factor we haven't discovered" with "this effect we already knew about is stronger than we had previously thought."
Anton, my dude, those are Kalamata olives in that sourdough at 7:08, not raisins. It’s delicious and I highly recommend it.
I always assumed they accounted for time dilation when figuring out the expansion rate and acceleration of the expansion. It surprises me that this is a new thing.
I’ve always felt that dark energy didn’t make sense, glad to see I’m not alone.
This would certainly explain why they find things surprisingly old.
@BAGG8BAGG