Paper Definition and 999 Threads

Is the speed at which the paper helicopter falls due to its increased weight because gravity is stronger, or is it because air resistance is unable to keep it in the air because the weight is stronger than air resistance?

An article by an author whose paper was proved wrong https://www.nature.com/articles/d41586-024-02870-z

Conservation of energy is invoked, which I understand, but the author omits most of the steps. He arrives at (18): I've tried to substitute (13) and (17) into the LHS of the energy conservation equation, but the result is quite messy and my gut feeling is that it doesn't simplify in a nice...

I recently came across the following paper on QFT and Quantum Measurements. https://arxiv.org/abs/1311.0205 I have read it, but it may not be legit as it seems to accept the idea of virtual particles, which I find somewhat problematic, as discussed before. Before reaching any conclusions, I...

Hello. I came across this article, https://astrobites.org/2024/02/17/cosmic-inconsistencies/ and followed the link to this paper, https://arxiv.org/abs/2305.07049 Insights from HST into Ultra-Massive Galaxies and Early-Universe Cosmology and have read the .pdf For the moment I have just one...

Figure 1: I assume this is a conceptual question regarding the usage of the above inertia equations but the axes are really confusing me. I would imagine that around I1 and I3, you could say that the total inertia is just the sum of all the ring-shaped "slices" of the paper cups (i.e. use the...

I'm a junior based in the U.S and my research project is ending in one or two months, so I am writing a report with my results. I am not sure if I will be a first author as there are two other students, but they have graduated so I have been working on it alone for a while now since the summer...

Hi all and thanks for your time. I'm a little new to this site and was unsure what the prefix to this post should be, so I put it under 'intermediate'. Imagine having a piece of paper glued to the palm of your hand. You swing your hand down and the edges of the paper bend backwards because of...

Hi My grandson who is dyslexic and who I need to help sometimes has the attached example paper for an exam which is iminent. The lecturer has gone is unavailable and he seeks to try fnd a source for te answers. Its a shot in the dark but I wonder if anyone can help please? Thanks Martyn

I’ve been trying to understand the conclusions in this paper for a long time… https://apps.dtic.mil/sti/tr/pdf/ADA429637.pdf It seems it was published in Optical Engineering, Vol 38, No. 8, August 1999. I thought if we have a photodetector with no light shining on it and no outside voltage...

This paper is circulating around fintwit , has not been replicated, but does it pass a smell test? https://arxiv.org/abs/2307.12008 The First Room-Temperature Ambient-Pressure Superconductor Sukbae Lee, Ji-Hoon Kim, Young-Wan Kwon

I was wondering if anyone has read this new paper (link provided) one of the authors Will Kinney, seems very sure it forecloses on any cosmological model with no singularities. Can anyone speak about the limitations of the paper or if it does definitively prove a singular beginning in space...

So this is a paper by Xavier Michalet and Shimon Weiss C. R. Physique 3 (2002) 619-644, showing that S/N ratio is given by equation (2). This is a fairly famous comprehensive paper on fluorescence microscopy, where other references regarding the same topic show the same equation more or less...

Hi, I am looking for this paper in the study of Raman effect which has the following reference: Bir, G. L. & Pikus, G. E. 1961 Soviet Phys.-Solid State, 2, 2039. Can someone tell where I can find it? Thank you a lot for your help, TthePhysicist

I want to achieve this effect in Joplin. I need some CSS for it in userstyle.css. I've few examples here: https://freefrontend.com/css-paper-effects/ So, I am wondering if anyone could write a userstyle.css for me. I've gave a try but it's not working. /* The below controls how a note...

A paper by Nhat-Minh Nguyen, Dragan Huterer, Yuewei Wen titled "Evidence for suppression of structure growth in the concordance cosmological model" https://arxiv.org/abs/2302.01331 The abstract says: We present evidence for a suppressed growth rate of large-scale structure during the...

Gets into a lot of stuff tucked away in the 98 page report from OpenAI on GPT-4. - GPT-4 can process a lot more text in queries than GPT-3.5 - training data cutoff was at 2021 same as ChatGPT but it seems that the ChatGPT cut off was later in the year. - in contrast Bing with GPT-4 can search...

Looking for something else I just stumbled over this paper the declare as introducing a field they call "bayesian mechanics". I thought I would create a new thread for a change and just highlight this paper. It's the first time I've seen this from the authors so I don't have their full...

Hi. I am looking for scientific papers, articles and/or even simulations that investigate how many moons it would be possible for earth to have and maybe modern theories about what these moons can be and look like (i.e what characteristics they have) if they were to exist. I have googled and...

Why all scientists write math/physics on blank paper, for example Einstein,in that time already exist lined/cell papers? Is there any benefits to use blank paper notebooks when study engineering? What notebooks do you use when study math/physics/engineering?

I am marking this now...just need your insight...the second part has [2] marks. I am giving [1] mark for the correct method...i expect use of second derivative test or otherwise for Method Mark...then the correct answer ##(0,0)## would realize the Answer mark. The student has not shown any...

Hello! This is quite a specific question, so if anyone knows the details I would really appreciate your help (@Twigg ?). I am trying to reproduce figure 1 from this paper (it's for the PV experiment performed on BaF). While I am getting quite close to it, the levels don't fully match (I am...

The famous Maldacena's paper, the first paper on what is today called AdS/CFT correspondence, is published in two journals. It's not two parts of one work, it's one complete paper published twice. I presume that there is some interesting story behind it, but I don't know it. Does anybody know...

I'm reading Tipler's 1976 paper, "Causality Violation in Asymptotically Flat Spacetimes" and he keeps using a symbol which seems to resemble the symbol for Future Null Infinity in a strange font, but it's usage doesn't make sense with what I would expect if that's what the symbol meant. He...

Summary: doesn't this decrease entropy ? Cellulose is known for its hydrophilic quality, which can be explained from the polarity of its hydroxyl groups. We all know water can overcome the force of gravity through a piece of paper you put in the water. Correct me if I'm wrong but this is a...

Hi. My paper has just been accepted by PRD. Can I still submit this manuscript to arXiv? Will this action violate any copyright? Thanks.

Have these articles been discussed here previously? I could not find it but my search skills suck. Kerr stability for small angular momentum https://arxiv.org/abs/2104.11857 (just 800 pages) Recently (31th May this year) Wave equations estimates and the nonlinear stability of slowly rotating...

Hot air rises due to the candle below. But how does that create a horizontal force, which is needed to produce the rotational torque?

Hello. Could somebody please explain to me why the discovery of the unexpected number of spiral galaxies in this image is a cause for panic? My naïve understanding is that this is at odds with the currently accepted model of galaxy formation in the early universe. Any help give at a Basic...

A new group of investigators are attempting something similar to Deur's work, which seeks to explain dark matter phenomena with general relativity corrections to Newtonian gravity is systems like galaxies. Deur's most similar publication to this one along these lines was: One thing that makes...

hello everyone! Recently,i'm reading a paper about slow light,that's really a famous work published in Nature.[Light speed reduction to 17 metrespersecond in an ultracold atomicgas]. But I'm trouble with some calculation about the velocity of slow light.here are below: i try to use the...

I cannot find the paper that is referenced here https://www.nist.gov/publications/why-minkowski-spacetime-non-euclidean Why Is Minkowski Spacetime Non-Euclidean? Author(s) J M. Cronkhite I have looked here https://aapt.scitation.org/action/doSearch?SeriesKey=ajp&AllField=Cronkhite&ConceptID=...

Yesterday Jonte Hance and Sabine Hossenfelder published this preprint on the arXiv: https://arxiv.org/abs/2206.10445 What does it take to solve the measurement problem?

I am increasingly anxious since my first paper was submitted to journals and it has been rejected three times directly by editors. Although my advisor thinks it is an interesting work and keeps submitting it to high-quality journals, I am not very confident in myself. I am always worried that...

8778 authors - curious how they coordinated that https://hal.archives-ouvertes.fr/hal-03583443

Hi guys.Lately I have been posting questions related to paper material and I am getting no replies (here, here and here). I am convinced it's not only due to the difficulty of the topic but the way I am posting it. Should I "go to the point"? Honestly, it's also acceptable that people only...

Hello! I have a question about this paper. They claim that the hyperfine and spin-rotational terms can be treated perturbatively (they do perform a full diagonalization, too, but they claim that perturbation theory is good to get an estimate of the effect). I agree with that for most of the...

(I have to write a 1500 word essay briefly explaining quantum magnetism. But i am having a hard time structuring my essay as I need to select what is crucial and what is not since 1500 words is not a lot. is there anyone with any input for me? Ideas, recommendations, sources anything is...

Hi, In my old age I've gone back to study physics at college. I own a really old (1976) edition of Feynman's physics textbooks, but the paper has yellowed to the point where I have trouble reading them, the contrast is low even though the print quality is ok. Is there a printing on good...

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A week ago I accepted to review a paper for a top journal. I was contacted because I've published several papers on the same semi-obscure topic in the last two years. I accepted because the abstract was interesting and thought provoking. However, after having access to the full paper I...

Hi PF! Two years ago my lab launched experiments aboard the ISS. The experiment was simple: place two water droplets on a substrate, set camera above the drops, and watch them coalesce. However, the exact size of the drops is unknown (approximately 1 cm radii, though this number is debated)...

Hi all, I am currently reading Bardeen's Paper on The Four Laws of Black Hole Thermodynamics: https://projecteuclid.org/journals/communications-in-mathematical-physics/volume-31/issue-2/The-four-laws-of-black-hole-mechanics/cmp/1103858973.pdf and am struggling with the derivation of equation 26...

Hello everyone, I'm a physicist so I'm not an expert in immunology etc., but I'm interested in this topic. I read the abstract of this paper (Discussion was very scholarly for me) but still, I'm not sure if I understand it correctly. So I have some questions: 1) Is there exist some possibility...

Summary:: What is this? https://arxiv.org/abs/1703.10470/

There is a soviet paper I would really love to read: https://www.osti.gov/search/semantic:5509754. Unfortunately, I have found no pdf nor anything of the sort on the Internet. Google told me it was published by some Ukranian University (thankfully it still exists and has a website). There is 1...

I can read less text content easily. my way of reading it is to make slides of all those texts and learn from the slides. But I have issue with reading huge huge texts as you know in this case it will require too much time when I do this. Is there way to simplify this reading style? eg-: of...

What mechanism or mechanisms cause filter paper to block coffee oils? As I understand it, these "oils" are mostly cafestol and kahweol, which are both functionalized polycyclic molecules with a molar mass around 315. Cloth filters do not prevent these oils from getting into the brewed coffee...

I bought a paper written by Kuo-Ho Yang (gauge transformations and QM) in which i read this: since Lamb [1] asserted that in order to describe the interaction of a bound system with external time-varying fields to the lowest order and in the long wavelength approximation one should use an...

Summary:: Searching for Paper by R H Dicke Good day all. Does anyone know where I might obtain a copy of the Paper R. H. Dicke. Gravitation without a principle of equivalence. Review of Modern Physics, 29(3):363–376, 1957 I am prepared to pay for it. Thanks Paul