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#spacetime

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Cosmic ceilidh

Hundreds of scientists are set to perform a new Scottish country dance inspired by the ripples in spacetime whose existence was first theorised by Albert Einstein.

Researchers from the University of Glasgow teamed up with the culture and research organisation Science Ceilidh to develop a dance to mark the 10th anniversary of the historic first detection of gravitational waves.

gla.ac.uk/news/headline_119503

www.gla.ac.ukCosmic ceilidh dance set to celebrate historic science discoveryResearchers from the University of Glasgow teamed up with the culture and research organisation Science Ceilidh to develop a dance to mark the 10th anniversary of the historic first detection of gravitational waves.

New theory proposes time has three dimensions, with space as a secondary effect

New theory proposes time has three dimensions, with space as a secondary effect

Time, not space plus time, might be the single fundamental property in which all physical phenomena occur, according to a new theory by a University of Alaska Fairbanks scientist.

It's about 'time', ha, ha. I said for a long 'time' that if it wasn't for time, we wouldn't be here. Physicality depends on it, whether you are a biological being, a star, or a speck of dust.

#time #space #Spacetime #reality

phys.org/news/2025-06-theory-d

Phys.org · New theory proposes time has three dimensions, with space as a secondary effectBy Rod Boyce

Scientists have found evidence supporting Einstein’s prediction of “gravitational memory,” a permanent spacetime distortion caused by gravitational waves. New research suggests these wrinkles might be detectable using existing technology, revolutionizing our understanding of black hole collisions and Einstein’s general relativity.

@goodnews

#Physics #Einstein #BlackHoles #SpaceTime #GravitationalWaves #Science #GoodNews #Astronomy
livescience.com/space/black-ho

Live Science · Unproven Einstein theory of 'gravitational memory' may be real after all, new study hintsBy Andrey Feldman

   
#ThoughtExperiment: Many #Worldlets?

or in other words, fractions of #World, not the whole World. #TimeTraveler #theories often involve splitting or multiplying #universes. Time Travel events divide #spacetime into two near-identical clones. Grandfather lives and does not, you did not meet yourself and then you did. But if we think this through further, its scope might not be quite so universal as it is typically presented.

Take 3 heavenly bodies: Mother #Earth, the #AlphaCentauri triple star system (at 4+ light years away), and #Polaris, the #NorthStar (at 400+ light years away).

Now we program our #TimeMachine to take us back one year (#retrograde) where we meet ourselves. Hi us guys! This all takes place in one year. There's the original us, there's us leaving the present, and there's us meeting ourselves a year earlier — standard #boilerplate #scifi #movie #script.

Alpha Centauri will have to wait another 3 years before any of this information can get to there. This is related to the concept of a #lightcone which expands at the speed of light. This doesn't sound quite so much like a newborn twin universe, does it? Now what about the North Star? It will have to wait 433 years for news of our Time Travel event. And that's still pretty much in our tiny #celestial neighborhood.

The point is that the effects of such events are largely localized and rapidly diluted as we move farther away. This still has its problems, but it doesn't quite feel like the whole universe dividing into two — maybe part of it. Possibilities are that in moving further out, the effects of a Time Travel incident may be 'blurred out', as are anomalous samples in the law of large numbers.

🔗 Wikipedia.org/wiki/Many-worlds#ManyWorlds
🔗 Wikipedia.org/wiki/Light_cone#LightCone
🔗 Wikipedia.org/wiki/Time_travel#TimeTravel
🔗 Wikipedia.org/wiki/Law_of_larg#LawOfLargeNumbers

wikipedia.orgMany-worlds interpretation - Wikipedia
Continued thread

🎬 PS: For a beautifully clear (and delightfully mind-bending!) explanation of what might have existed before the Big Bang, check out PBS Space Time’s fantastic episode, "What Happened Before the Big Bang?" hosted by astrophysicist Matt O’Dowd. Highly recommended as a thoughtful companion to this thread! 🌌🌀✨

👉 Watch it here on PBS Space Time pbs.org/video/what-happened-be

www.pbs.orgPBS Space Time | What Happened Before the Big Bang? | Season 5 | Episode 29We actually have a pretty good idea of what might have happened before the Big Bang.

A rare cosmic phenomenon called an #Einstein ring.

There are two galaxies, separated by a large distance. The foreground galaxy is at the center, while the background galaxy appears to be wrapped around the closer galaxy, forming a ring. 

The light from the more distant object is bent about a massive intermediate object because #spacetime, the fabric of the #Universe itself, is bent by mass, and therefore light travelling through #space and #time is bent as well.

esa.int/ESA_Multimedia/Images/

Continued thread

2/2…or #Spacetime if you prefer. Unfortunately they look different and possibly are from somewhere else. Also interestingly they seem to be becoming less and less reticent about demonstrating those performance capabilities to our latest detection technologies.At this point the evidence is hard to ignore. We probably don’t need a new accelerator. All of the challenges in this current situation encompass our inability to get over ourselves, literally.