Negative time or redshift?

[genotics]

Louis, are these people colleagues of yours?

https://arxiv.org/pdf/2409.03680
https://arxiv.org/pdf/2310.00432

[mikehelland]

Here's an easily accessible video by Anton Petrov on the paper:

https://www.youtube.com/watch?v=_ih1Ofn8k1s

[genotics]

Hi Mike, Actually that is where I found the article. Interesting fact: Petrov did a degree at McGill and worked as a researcher in astrobiology under Hojatollah Vali, who founded the program. Back in the 1990s I helped organize a conference with Vali and a few others and I used to visit Vali occasionally in the 2000s. However, I don't recall ever seeing Petrov. Smallish world! Roy

…

On Sat, 4 Jan 2025 at 01:10, mikehelland ***@***.***> wrote: Here's an easily accessible video by Anton Petrov on the paper: https://www.youtube.com/watch?v=_ih1Ofn8k1s — Reply to this email directly, view it on GitHub <#298 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AXUANG6ICY4I7PQGTP422OT2I53NVAVCNFSM6AAAAABUSZIT5OVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCNZTGE2TCNI> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[RedshiftDrift]

Hi Roy @genotics I know Aephraim Steinberg, he's at U. of T. Years ago, he was measuring negative time delays (or faster than light) tunneling... and his web page is fun.
I guess now he's using group delay to show the weird effects that arise when one takes the "photon" picture too literally (e.g. @sahil5d's description of light).

This kind of thing is good for the graduate students listed as authors. I did a similar experiment 25 years ago in the third lab down the hall from Steinberg's lab. We got a 3 ns "negative time offset" before the main pulse. (This was following work on delayed pulses done ten years before.)

Steinberg et al. do a more difficult measurement (see section about systematic effects) and get 30 ns, so they beat us by a factor of ten and the data still fits theory. Good for them!

There is a well understood AC-Stark shift, but no redshift compatible with the cosmological redshift.
That's the same old, same old, same old, same old, same old, same old stuff. 😞 🥱

Although this is good material for graduate students in experimental physics, there is no new physics to be learned from it.

[genotics]

Hi Louis, I think you ought to post your response (the physics parts) to the comments on Petrov's commentary. He does appear to have a substantial following, and any exposure there might lure a few critical minds into our net. Cheers, Roy

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On Sat, 4 Jan 2025 at 17:40, Louis Marmet ***@***.***> wrote: Hi Roy @genotics <https://github.com/genotics> I know Aephraim Steinberg, he's at U. of T. Years ago, he was measuring negative time delays (or faster than light) tunneling... and his web page <https://www.physics.utoronto.ca/~aephraim/> is fun. I guess now he's using group delay to show the weird effects that arise when one takes the "photon" picture too literally (e.g. @sahil5d <https://github.com/sahil5d>'s description of light <#162 (comment)> ). This kind of thing is good for the graduate students listed as authors. I did a similar experiment 25 years ago <https://pubmed.ncbi.nlm.nih.gov/18059802/> in the third lab down the hall from Steinberg's lab. We got a 3 ns "negative time offset" before the main pulse. (This was following work on delayed pulses done ten years before <https://opg.optica.org/josab/abstract.cfm?uri=josab-7-9-1960>.) Steinberg et al. do a more difficult measurement (see section about systematic effects) and get 30 ns, so they beat us by a factor of ten and the data still fits theory. Good for them! There is a well understood AC-Stark shift, but no redshift compatible with the cosmological redshift. *That's the same old, same old, same old, same old, same old, same old stuff.* 😞 🥱 Although this is good material for graduate students in experimental physics, there is *no new physics to be learned from it*. — Reply to this email directly, view it on GitHub <#298 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AXUANG62R5N4LLOD5JLGF6L2JBPNDAVCNFSM6AAAAABUSZIT5OVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCNZTGYYDGNQ> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[RedshiftDrift]

Petrov has done a good job explaining the physics. My plate is already full with cosmology, I have to choose my battles...