immmmmm

31 ms·

271.
by immmmmm 6y ago
I have a question: When i finished my theoretical Physics PhD, HFT was THE way out of academia for making money in my field. I didn't follow this path as it felt at the time a pretty evil thing to do. Does HFT provide any benefits for
272.
by immmmmm 6y ago
I cannot agree more. If i could upvote twice i would. We are loosing biodiversity at a rate comparable to the last mass extinctions, we are loosing our "life support systems" as climate/biodiv. experts say, yet no one is conc
273.
by immmmmm 6y ago
Some points that this kind of articles typically fail to address: 1) Storage of waste is still an unsolved problem. Even here in Switzerland, which is a very rich country, there is no definitive agenda for storage. 2) We are in the middle o
274.
by immmmmm 6y ago
i did a phd, got highly cited and was promised to a successful career. i did not continue tho because: 1) the high-energy field is in deep crisis, unlike in Dyson era there is almost no new experimental data. 2) seeing people trying to get
275.
by immmmmm 6y ago
hahaha thanks!
276.
by immmmmm 6y ago
correct! but if you introduce a derivative which is covariant under diffeomorphisms and u(1) transformations D = d + \omega + A you see that gravitation (connection \omega) enters on a somewhat same footing as the electromagnetic potential
277.
by immmmmm 6y ago
neither is local gauge invariance for maxwell
278.
by immmmmm 6y ago
Ah sorry, i did 8 years of GR and strings.. I was replying to the headline: 'umm, yes and no...'
279.
by immmmmm 6y ago
suppose you have an electric field described by a potential \phi, the force is F = - q * d\phi/dx where q is the electric charge now suppose you're in a gravitational potential \phi_g, the force is F_g = - m * d\phi_g/dz wher
280.
by immmmmm 6y ago
umm, yes and no... the key principle of general relativity is the equivalance principle: there is no (local) way to tell if you're being accelerated (in a spaceship for instance) or in a gravitational field. in other terms the inertial
281.
by immmmmm 6y ago
I was trying to say three things: 1) it still somehow works like other fundamental forces since it derives from asking invariance under a local symmetry group 2) it is different from other forces since the symmetry group associated to it is
282.
by immmmmm 6y ago
Physicist here, gravity is a force, just a different one. Also, like everything else in physics: it depends how you observe it. For instance, electromagnetism comes from the curvature of a U(1) bundle over space time, the (local) U(1) symme
283.
by immmmmm 6y ago
Am I the only person shocked there is absolutely no reference to scientific work in their text? For instance, a question: what do we do of people without preexisting conditions that recover very badly from the infection: https://
284.
by immmmmm 6y ago
I had the opportunity to work in one of the world best nano technology lab. My supervisor once told me that he refused to work on nano-structured batteries for an obvious reason: These are impossible to recycle. Science these days is often
285.
by immmmmm 6y ago
Einstein did not believe in gravitational waves either. He also famously added the cosmological constant because he didn't like the idea of an expanding universe.
286.
by immmmmm 6y ago
exactly! i did try to optimise fortran and it was quite painful for little gain.. BTW it was him: http://www.theochem.ruhr-uni-bochum.de/~legacy.akohlmey/inde...
287.
by immmmmm 6y ago
What is even more intriguing is that this tiny deviation is responsible for you being attracted to Earth :) In weak gravitational fields like on Earth, Gravitation is only a time distortion.
288.
by immmmmm 6y ago
Not a C++ expert, but I first encountered it 20 years ago with Windows API and it looked uglier than some dialects today. Agreed, it's not optimal when the complier spits 100k lines of error messages for a single template typo, yet it&
289.
by immmmmm 6y ago
First time a phone was advertised unlocking with facial recognition, it took one day for researchers to unlock it with a printed photograph. Try that with modern phones.. I have done three years research on that topic: yes there are out the
290.
by immmmmm 6y ago
Researcher in biometrics working on contactless palm/finger recognition here. 1) A new innovation ok. People have been doing that for more than a decade, my group included. 2) Given the sensors look, it's almost certainly near inf
291.
by immmmmm 6y ago
Also the power needed to grind clinker down to powder is huge, overall comminution (grinding) industrial processes are among the biggest electricity consumer in the world. Cement ball mills are less than 1% efficiency. https://en
292.
by immmmmm 6y ago
... and string theory was the most badly funded field i ever worked in...
293.
by immmmmm 6y ago
I really like her blog, it brings a lot of critical thinking in a field that often lack of. I however think she misses the point by constantly taking string theory as the sole example of bad science.. Disclaimer: I a former string theorist
294.
by immmmmm 6y ago
Combustion and fluide dynamics in a rocket engine are very complicated to simulate. I’m not a SpaceX fan but they have talk on that somewhere on yt.
295.
by immmmmm 7y ago
Trump??? Is that a new Godwin point??? I suggest you read this article: https://arxiv.org/pdf/2001.10952.pdf As you can read there it will threaten our ability to detect dangerous objects. As well as other things. We h
296.
by immmmmm 7y ago
I have no problem that people follow their dreams, on the contrary, when it is done with respect to others. The Starlink constellation, so far, is not respectful to people who want a clear sky for instance. Regarding Mars, I don’t want to t
297.
by immmmmm 7y ago
Agreed. Just think of the “maintenance” problem. Equipments do fail eventually
298.
by immmmmm 7y ago
I am not pessimistic, I am a scientist that just read the literature. We have now extinction levels 1000-10000 higher than background, this more than previous mass extinctions and expected to go 10 fold worst in the next decades. Moreover w
299.
by immmmmm 7y ago
I don’t get the point 1) we are plain in the middle of a mass extinction event, expected to get much worst in a decade or two. Wouldn’t it be good to solve that first? 2) we need a 4th industrial revolution to survive global warming as a ci
300.
by immmmmm 7y ago
If your goal is to evade biometric recognition by your local oppressive government: try makeup:) I work in the field and can tell you that 1) it’s cheap and easy 2) no presents sensor technology can detect it 3) detection algorithms will be

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