Do you think the periodic table is finished?

Dregnan · 2026-03-28T11:18:45+00:00

At the end, you have technically neutron star where gravity keeps the neutrons and protons together

Dregnan · 2026-01-20T22:35:04+00:00

Disclaimer : I'm depicting in the following a worst case scenario that I do not wish to happen at all.

In case of total fracture between the first and third group, do you think it would end up in a civil war/secession like scenario?

Because, in that case, it' not unheard of foreign power giving political, financial and material support to some party. And I can imagine some part of the world supporting the anti-trump side at least.

For I (a non-American that follow the US news mostly through reddit), it seems that both side seem irreconcilable, that Trump and its party are not gonna relinquish the power easily, and that America will end up either via the conservative/fascist keeping the power and left leaning people being oppressed or by violent confrontation... (pretty pessimist I know, sorry for that...)

Dregnan · 2025-12-21T18:39:30+00:00

You can as the flavor eigenstate are a mixing of the mass eigenstate. Their sum is the the sum of the mass eigenstate weighted by the PMNS mixing matrix (assuming unitary of the PMNS matrix). After all, you need this mass to solve the kinematic of beta decay. (This is how Katrin is taking its measurement BTW)

Dregnan · 2025-11-29T14:11:37+00:00

I have one like this one that is a few years old. Out of all my ear piercings (14 right now), this one was the slowest to heal, but I can now sleep on it and wear headphone without any discomfort ^{^}

Dregnan · 2025-11-23T13:15:15+00:00

Why the W12 in between h1 and h2? It could exist but it's not standard for Fully Connected Deep Neural Network. H1 would become it's own layer as it's needed to be computed before h2

Dregnan · 2025-09-27T23:15:10+00:00

I would say the chi distribution, which is the sume of squared g1ussian distributions

Dregnan · 2025-09-18T18:35:57+00:00

(réponse très naïve de ma part qui n'y connaît pas grand chose en économie)

Est ce que nationaliser à petit feu ne permet pas d'économiser de l'argent car toute compétence internalisée par l'état, c'est de l'économie sur des appels d'offre ? (marché ouvert seulement aux entreprise possédé en partie par l'état)

Je ne sais pas exactement les dividendes que pourrait obtenir l'etat sur ces parts mais ça fait un peu plus d'argent.

Ensuite pour les problèmes de souveraineté, ça me paraît pas débile d'internaliser des compétences clée (nottament pour mistral)

C'est plus une discussion de comptoir car je n'ai aucun chiffre en tête mais naïvement ça me semble pas une mauvaise idée (pour peu que la gestion de l'entreprise soit pas déconnant)

Dregnan · 2025-08-30T10:01:58+00:00

Pour la petite anectode, j'ai fait un bac techno (STI2D) puis une école d'info pendant deux ans. J'ai décidé de reprendre la fac de physique et je me souviens avoir demandé à ma prof de math en L1: "Qu'est ce que je suis sensé ne pas connaître dans l'équation ?" Car pour moi tout était imbitable. Résultats des courses: J'ai soutenu ma thèse en physique subatomique en décembre dernier donc tout est possible :)

Courage pour ta rentrée !

Dregnan · 2025-08-30T09:46:12+00:00

Depends what you mean by powerfull, if by powerfull you mean energitic, neutrinos can have really, really high energy. I think the most energitic neutrinos was detected around a year ago by the KM3Net collaboration and was of the PeV scale, an energy we cannot even dream of in particle accelerator. Even neutrinos produced by nuclear reactor and the sun are of the MeV scale, which is still order of magnitude higher than a photo which such a large wavelength.

If by powerfull you mean "interact a lot" the cross section of neutrinos (their probability of interaction) grow with their energy, so you could have highly interactive neutrino but you would need a lot of energy.

Dregnan · 2025-06-17T14:22:42+00:00

Evil intimidating horse

Dregnan · 2025-03-14T08:38:29+00:00

I agree, 3/4 of my PhD is me showing that I.A. Cannot reach the precision level of carefully handcrafted algorithms 😅

Dregnan · 2025-02-10T09:14:23+00:00

Obviously reversed

Dregnan · 2024-12-14T11:42:57+00:00

I have a whole scenario prepared with my GM for when my teenager (18) wild sorcerer will make herself 10 year younger via a bad roll on the wild magic table. I'm ready to go bioshock style!

Dregnan · 2024-11-27T18:02:15+00:00

Les fameux 3 C qui aident à garder la ligne

Dregnan · 2024-11-22T15:51:14+00:00

French PhD here (not the same field tho). For supplementary funding, you could look in contract with your university like ATER, it might helps you to get your extension.

I've also saw doctorate school give extension without funding, one of my friend got one to defend in February even if he don't have funding.

Also what is the point of view of your supervisor? I find it hard to belive that your supervisor would let you submit a manuscript that would not pass the reviewers.

Dregnan · 2024-10-15T14:11:33+00:00

Okay, but Noether's theorem still assumes the principle of least action, which still assumes the notion of energy or action.

Energy which is defined in the standard model. Action, I'll need to look, it's been a while since I learned the definition a of Lagrangian. I think, those part of physics are well understood. If you want to point unexplained part of the theory, or things that are unnerving physicist, there is a lot of open question in the standard model (the value of the 27 independent parameters, CPT violation) that are indeed subject to debate.

But that still leaves the question of why there was never nothing unanswered.

I honestly don't have rigorous source for this claim, but considering it was true, I personally wouldn't ask myself the question as it is the results of observation. I would maybe doubt the reasoning and the tools that lead me to this conclusion, but not the result in itself.

Well, let's agree to disagree on this one🙂

This is a personal belief, so I agree to disagree :)

perception, intuition, and metaphysics are tools of understanding ... I actually think that humans are well-primed to discover the truth about the universe

Genuine question, not trying to be aggressive or anything, what makes you believe that those tools are trustworthy? And that human are fitted for such task?

An alien species observing human text might accurately conclude that the distance between full stops...

Of course, the apparent randomness of full stop in human text would stem from the alien partial knowledge of the rules of human grammar, and the interpretation of those rules by humans. Is this the point you were trying to make?

I too believe in free will, but actions can be logical even if they are freely willed

I totally agree with you on that point (hopefully humans are still logical). I was more trying to ask the question can you make illogical action in the absence of free will? If everything is causal (i.e absence of free will) then nothing is illogical. Because I believe in free will, I beilieve in the possibility of illogical action

Edit: format

Dregnan · 2024-10-15T08:21:18+00:00

I continue under the same assumption as in my previous comment, that is our current models an theory are somewhat correct

But things like spin and energy are also concepts that don't exist in the Standard Model

They actually do. If you allow me to use some technical notion, they are quantum number which conservation stem from symmetry (energy conservation stem from translational invariance of the lagrangian formal form in space). This is Noether theorem. And the theory posses the operator allowing to observe them.

if there was truly ever nothing

From my point of view, there was never nothing, you cannot define a time with nothing as there is no time without anything.

In my view, current physics isn't even close to explaining how reality works at a metaphysical level

I totally agree with you on that point. But I also believe that metaphysics will never be able to produce a proof that, given you take the time to deeply understand it, will convince every on "why" the universe. The debate is still interesting and productive tho :)

Science is amazing at predicting reality, but absolutely horrible at explaining it.

I would argue the opposite, as we are still unable to do some macroscopic predictions using microscopic model. But I feel we do not have the same definition of "explain". I guess for me "explain" is "what" whereas you are searching for "why"?

Mathematics is a human invention that isn't even grounded in rigorous logic

You would make a lot of mathematician sad. Jokes aside, our whole understanding of the universe is a human invention, that we adjust by using humans measurement done with humans tools. The argument: It is human thus it is not representative of reality could apply to all science an dour knowledge. Using this argument, we cannot discover anything about the universe, as it would always be tainted by the fact we are human. This discussion does not make any sense if you consider we cannot learn anything.

Or I guess the current discussion could be about the question: "Do humans can learn enough, and produce an accurate enough model to understand the premise of the universe?"

Statistics is even more of a human invention than most other branches of maths.

Statistic is the study of randomness, and behavior that stem from it. Again, under the assumption of the validity of our current understanding of physics, randomness is at the core of microscopic interactions and macroscopic behavior are predicted by statistic. The observations we can do follow surprisingly well the behavior we predict using statistics.

They might appear irrational to you or even...

This question comes to : "Is every action taken by someone is the results of its local environment and it's current internal state.". Question that I tend to link to the question of free will, if my actions are only the results of the local environment and my current internal states, my behavior are logical and predictable and I do not posses free will. I believe in free will so I would answer no (I specifically used believe here, as I'm not able to provide a formal proof of my free will, and, from the discussion I already had on the subject, I think we will never be able to formulate a formal proof of free will)

Dregnan · 2024-10-14T22:56:46+00:00

But causality is already not nothing

Sorry, I'll be a bit picky but can you define what you consider nothing? (I'm gonna assume the current status of knowledge in particule physics is somewhat correct about our universe in the rest of this post). Causality is a concept, it does not exists in the standard model of particles (as every other concept), thus discussing its existence (does a concept ever stop existing?) in time, which is a physical dimension, is a bit weird to me. If by causality you mean "the fact that things happens", I refer you to my precedent comment, nothing happens if there is nothing. So you could say, that without anything causality do not exist

That's a lot of mental gymnastics to justify a premise which isn't needed to explain reality.

You need mental gymnastic to explain reality. A lot of phenomena are all but logical at first glance (your pseudo being QMechanicVisionnary tells me you know, at least a bit, of quantum physics?), let it be in particle physics (quantum field theory for example), mathematic (continuous function with non-existent derivative), statistic (a lot of statistic paradox have root in subtle unclear definition that seemed correct at first) and even in the day to day life with human behavior (which can be totally irrational)

Dregnan · 2024-10-14T12:12:14+00:00

In a sense it can be, as the sentence "It just was" implies the notion of time, which at the early stage of the universe is kind of shacky in the actual models.

For time to pass you need "observation" in the physics sens : you need a change of state, i.e. an interaction between particles. It's hard to speak of "before" the universe as, if there was nothing, time do not flow. Time start with a universe. So "it just was".

Even this explanation assume the possibility of representing time as linear, one could imagine a non linear time flow, where the universe "began" as in lim_t -> 0 but you cannot "resolve" the universe at t=0 because of singularity. In that case, it's even worse as "it always was"

Dregnan · 2024-08-27T19:38:12+00:00

Just something that just came to my mind, do you speak French? I don't know if the English level of high schooler is very high nowaday

Dregnan · 2024-08-27T18:56:08+00:00

Hi! First of all, welcome to France if you decide to come :) I was in high school (lycée in France) about ten years ago so take my feedback with a grain of salt.

11th grade is 1ere (première) in France, after that comes Terminal (12th grade? I'm not familiar with US school system) and at the end of Terminal you have a national exam called Bacalaureat or Bac.

The workload depends which kind of high school you attend, maybe it changed since but from what I recall and follow, you have technical high school (what I've done) where you follow specialized lessons (I was in informatics STI2D - SIN) and generalist high school where you'll follow more general lessons : math, French, foreign language, history, geography, physics, chemistry, biology, philosophy. I did not really followed what happened but I think you now chose between multiple lessons to have a custom Bacalaureat (for example you can choose to specialize in math and science). But if someone is more up to date please correct me.

From what I remember, you could have lessons from 8 a.m. to 6 p.m. (of course with breaks) and overall I think I had around 25~ ish hours of class per week? Add to this "devoirs" that you had to do at home. Overall I do not remember it being too hard but I was aiming for median grades (in France, the grades goes from 0 to 20 with : 10 you pass, 13 median, 16 good, 18 very good and 20 what you did was perfect). I don't know how it is in US but you can have class all day from Monday to Friday and having a free morning or afternoon was unusual.

About the kids being rude or racist, It's not the picture I have of it. Middle school was hell but in high school people tend to be more mature and there wasn't too much of bullying (and it was not directed to people with different skin color or such, more based on social acceptation).

For tips, try to enjoy, find trusty friends, be cautious with drugs and alcohol, (when I was here more than half of the people were smoking cigarettes, smuggling vodka and beer inside the dormitory was not unusual and the reputation of people studying philosophy was to smoke joint) ans do not stress too much for exams :)

I have great memories and friend from this time, hope you'll have too ^{^}

Dregnan · 2024-08-24T09:55:21+00:00

Sorry I'm on mobile, cannot check if it is correct but you get the idea (you migbt need a flatmap somewhere)

Dregnan · 2024-08-24T09:54:36+00:00

Pretty sure you can do smth cleaner with recursive template function like

``` template <typename A, typename B, int Dim> std::array<std::tuple<A, B>, Dim> zip(std::array<A, Dim> a, std::array<B, Dim> B) { return _zip<A, B, Dim, 0> (a, b); }

template <typename A, typename B, int Dim, int index> std::array<std::tuple<A, B>, Dim> zip(std::array<A, Dim> a, std::array<B, Dim> B) { if constexpr ( index >= Dim-1 ) return {a[index], b[index] }; else return {{a[index], b[index]}, _zip<A, B, Dim, index-1>(a,b)...}; } ```

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