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In a new paper, a group of physicists claims to have confirmed the existence of “negative time.” I had never heard of this, but I had a look at the paper. And I think I have figured it out.
Paper: https://arxiv.org/abs/2409.
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This result challenges our fundamental intuition about how time flows, but that is what makes physics beautiful. The fact that photons can exhibit negative group delay in a transparent medium has been theoretically predicted for a while, but seeing it confirmed experimentally with such precision is exciting. It reminds me of how AI image generators can now create visuals that seem to defy conventional spatial constraints. Both fields are pushing boundaries of what we thought was possible.
The idea of ´negative time´ is doubtful/wrong
Because every object on earth is transported by its rotation, is moved by the earth around the sun — and the sun-system is part of a rotating galaxy in an expanding universe
All these movements are an essential property of every object — and to stop or even reverse time does mean that all these dynamic movements have to be stopped or even reversed too.
This is not possible
Physicists have not delivered a definition for TIME up to now!
Therefore all statements about TIME are of very poor quality.
And as long we do not know what TIME is — we can not measure TIME
Bishop Augustine distinguished in CONFESSIONS (book 11, chap. 13–29) already 1600 year ago — three different types: the a) divine, b) physical, c) human time / time-perception.
When we want to understand what TIME is, then we have to discuss these three types of TIME — each seperately
Interesting article — the “negative time” claim is a great reminder that physics often sounds stranger than it really is. The discussion around group delay versus actual time travel is especially important, because headlines can make a subtle result feel much bigger than it is. I also like how the post helps separate the experimental effect from the interpretation. For anyone who enjoys this kind of boundary-pushing idea, I’ve been experimenting with creative tools like phonk maker to turn abstract concepts into something more vivid and memorable.
It’s interesting how a lab measurement about photon group delay gets framed as “negative time” in the headline. The article does a good job clarifying what the experiment actually shows.
her trees puzzle dream
It’s interesting how a lab measurement about photon group delay gets framed as “negative time” in the headline. The article does a good job clarifying what the experiment actually shows.
The distinction between group delay and actual time travel is easy to blur, so I appreciate how clearly the article walks through the physics.Her Trees