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>Each laser pulse of >0.1 J of energy and length of 5 ns produces 10^13 mesons. (...) A particle accelerator would need an energy of at least 10^21 eV to produce a similar shower of 10^13 mesons.

10^21 eV = 160 J; apart from the size improvement that's quite an efficiency boost too!

What about medaughter?

This is really neat! I hope this paves the way for the miniaturization of other kinds of particle accelerators. It would make particle physics significantly cheaper and easier to set up.

This seems absolutely insane. I don't know what the energy requirements to produce H(0) are, but unless they're astronomical, this basically means table top fusion reactors.

Since there isn't more buzz about this, I have to assume there's a catch or a big systematic error, but I look forward to discussions on the topic.

Edit: I looked up the author. He's a cold fusion crackpot and the existence of H(0) hasn't been replicated by anyone. https://physics.stackexchange.com/questions/36064/is-ultradense-deuterium-real/75183#75183

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You really should refrain from calling him a crackpot and I don't think cold fusion at this point is a useful term because even if you entertain the original Pons-Fleischmann results as having any validity the alleged mechanisms behind them are very different than the H(0) discussed in this paper. You are correct that what he is describing would lead to table top fusion if true and the same author actually published a peer reviewed paper in 2015 claiming to have achieved net fusion. It's surprising that I had never heard of it until now.
https://aip.scitation.org/doi/10.1063/1.4928572

I agree that it's odd nobody else is working on replicating this researchers results that I can find. I'm not sure how to explain that, but until somebody attempts and get's a null result I think we should refrain from calling him a crackpot. It looks like he is still holding his position at his University and publishing papers. I even found an old news article about his 2015 paper where the University stands by the results. It's interesting, but yes we should be skeptical.

https://www.google.com/url?q=https://web.archive.org/web/20151016203132/https://www.gu.se/english/about_the_university/news-calendar/News_detail//small-scale-nuclear-fusion-may-be-a-new-energy-source.cid1323710&sa=D&source=docs&ust=1672450495019957&usg=AOvVaw1SKJUPL-pttIzlYgS7zQRa

Thank you for doing the Google rabbit-hole! Saved me 20 minutes and a subsequent hour of frustration.

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Thank you. I hope we can refrain from inflammatory language (crackpot) and discuss the facts, measurements, and arguments.

It's an mdpi journal. Most of the time you can dismiss the garbage they publish without a second thought.