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neilparker62
Science Advisor
Homework Helper
Education Advisor
Insights Author
Hi. Did you get your reference from someone on PF ? I can write something like I see you regularly posting interesting Maths/geometry problems and contributing to discussions around those.
M
What is the chemical potential of an element in a compound from DFT if the system is not assumed to be in equilibrium with any external reservoir? Can a compound be considered naturally “Li-poor” simply because it contains a relatively small fraction of Li atoms, when if it is not equilibrated with Li metal?
Ibix
Ibix
Welcome to PF. You've posted this question on your profile, which won't be seen by many people and where replies can't exceed about 500 characters. Go to the PF front page and go into an appropriate forum (this one, I suspect), click the "Post thread" button, and post there instead. Include what background reading you've already done to provide context for answers.
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M
mdtsakir
Thank you! I have done it.
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F
Hi everyone! I love physics..as a physics teacher..i am fond of quantum mechanics.. I’m also a wildlife and aquatic-biology enthusiast. I run an educational blog fishiohub where I share detailed articles based on real observations, scientific references, and practical experience related to fish behavior, feeding patterns, like snapper diet,
sharps4590
73 year old retired electrician/contractor, married to the same wonderful woman for 47 years. "The Big Three" interests are old guns, guitars and British sports cars. Been playing guitar for 64 years, own 3 MG's and one Morris Minor 1000 and too many old domestic and German firearms to mention. Have two sons in their 50's, no grandbabies. My most frequent best friend is my Siberian Husky, Steele. I've owned Husky's since 1995.
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sharps4590
sharps4590
"I am the way, the truth and the life. No one comes to the Father but through me". John, 14:6
sbrothy
Gold Member
Hope this isn't too personal, but the exaplanation goes a long way:

I hope this message isn't too public but I have a mother receiving palliative treatment for stage 4 cancer. As you might imgaine this takes up a big part of my life. Especially, as I'm the oldest of a flok of 4 siblings. I put up a brave face, but when push comes to shove things aren't great.
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sbrothy
sbrothy
I even have a registered company "Odense Metallurgy, Electronics, Chemistry & Computing". It kinda covers everthing! :woot:
berkeman
berkeman
>>I hope this message isn't too public

If you want to have a more private conversation with @sophiecentaur you can hover your mouse over his avatar and click on "Send direct message". That will start a conversation between just you two, as opposed to posting a Profile Message which is visible to all.
sbrothy
sbrothy
Yes, I thought so to but his got his privacy set so that's a no go.
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ChrisF
Thank you for speaking up for me. I really appreciate it. I just want to ask questions and learn — glad someone saw that.
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jedishrfu
jedishrfu
PF is a different place with higher moderation than most websites. We are passionate about mainstream STEM topics and enjoy discussing papers, provided they have been published in reputable journals.

Bottom line: review our site's global guidelines and avoid personal theories, speculation, and fringe science.

Instead, ask a question. If you're unsure, you can always reach out to a mentor.

Welcome to PF,
Jedi
ChrisF
ChrisF
Thank you again for speaking up, I appreciate it.
I'm stepping back from posting. My questions sit at the edge of wave mechanics and particle physics, and I'm worried I'll connect something to my own work and accidentally cross one of PF's lines
I've had Zenodo downloads from MIT and UMass Boston, opens from Weizmann and LMU Munich. Hoping to hear back from them.
May pop in to read time to time. Don't want to cause problems — never my goal.
Christian
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ChrisF
ChrisF
i happily just got accepted for research gate to :)
Nerissa
My name is Nerissa,and I'm from China. I'm a new member. Please give me more advice.
berkeman
berkeman
Sure. Advice about what? :smile:
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berkeman
berkeman
Hey @Nerissa -- I sent you a DM with instructions on how to start threads in the technical and schoolwork forums. Hopefully that helps you get started here. Feel free to ask questions if we can help you get started here. :smile:
goathiggs
Hello guys,

I am interested in being a particle physicist in the future, and right now i am majoring in Quantum Technology with a sub major in engineering. There is a second sub major which is quantum computing and communications. I was wondering what sub major would be better for the career i want to pursue? Or if it wouldn't make a big enough difference.
Ibix
Ibix
Here, you're posting on your profile, and not many people will see it and replies can't exceed a couple of hundred characters. Go to our STEM academic advice forum and click the "Post thread" button and ask again.
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MrApple12
Learning Python, C++, SQL! Any recommended books is appreciated! Thanks!!
berkeman
berkeman
Welcome to PF. That question is best posted in the open forums in the Textbooks sub-forum. That should get you some good replies. :smile:
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TensorCalculus
Gold Member
2025 Award
Leading a hackathon tomorrow... so scared... but also super excited :)
berkeman
berkeman
Awesome! You will do great -- have fun! :smile:
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TensorCalculus
TensorCalculus
Thank you so much!!! Now there's only 2 hours till the hackathon the nerves are hitting me: 12 hours of managing 60 teenage nerds... welp...
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TensorCalculus
TensorCalculus
Update: everything went very well! It was chaos but it was amazing, and not so chaotic that we had any problems. Some of the most fun I've ever had!!!
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dlbruce0107
I was reading Anderle's TQB and they mentioned wives and their husbands' skid marks and I got distracted thinking about the probability of a grown man . . . Well, anyway I started thinking about the physics of skid marks — obviously I googled.
Hi! Looking forward to understanding the calculus of skid marks!
berkeman
berkeman
Some parts of your Profile post are problematic, but let me take it at face value. Please post your questions about friction and skid marks in the Classical Physics forum and post links to your reading that you've been doing about friction and tire skid marks. That will help us to try to help you understand what you are asking about.
dlbruce0107
dlbruce0107
Just what I wanted to know.
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Baakii
Let's Talk Big Bang and the Start of Our Universe! (Help Needed: My English is Basic, So Let's Make This Fun!)"Hello everyone! 🌌 I'm from Mongolia and super excited to chat with anyone who loves learning about the Big Bang and how our universe began. But honestly, my English is not perfect – it's a little bit broken sometimes. 😅 So, please be patient if I make mistakes, and let's help each other out!
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berkeman
berkeman
Welcome to PF. :smile:

Please read through our Insights articles about the Big Bang: https://www.physicsforums.com/insights/?s=big+bang

and if you have questions about that reading, start a thread in the Cosmology forum. We do not generally discuss science questions in Direct Messages (DMs). Thanks.
Steve Lawrence
Steve Lawrence
Hey I'm also interested in it how that small dense point smaller than a subatomic fragment but highly charged like a super black hole became what we now call the universe ,as a result of quantum fluctuations
SarcasticSkot
Hello everyone I’m Skot. I’m an amateur wannabe physicist, a father, inventor, writer, guitarist, music producer, Photoshop aficionado, audio engineer, and retired TV and Radio Broadcast Engineer for the NFL and MLB.

I’ve been writing down a lot of the crazy ideas I’ve had rattling around in my head and finally decided to see if they hold any value to the scientist community. I want to help push humankind forward into a future I know we can achieve.
berkeman
berkeman
Welcome to PF, Skot. Please keep in mind that we do not allow personal speculation at PF. Discussions have to be based on science as published in the professional scientific literature (peer-reviewed journals and mainstream textbooks). Please have a look through the PF rules (see INFO at the top of the page). Thanks.
SarcasticSkot
SarcasticSkot
All of my concepts are expanded from published particle physics, quantum mechanics and other sciences. Are you saying this site doesn’t encourage theoretical discussions within the current sciences?
berkeman
berkeman
We welcome discussion of published articles (modulo the Clarivate list mentioned in the rules), but likely would not allow proposed extensions to those published works (until those extensions themselves have also been published).
TensorCalculus
Gold Member
2025 Award
I've had 6 coffees in the past 2 hours so now my physics is turbocharged :woot:
sophiecentaur
Science Advisor
Homework Helper
I just discovered this messaging facility. Message: Keep posting questions and don't worry that they may sound daft. It's PF's fault if you don't get proper answers to put you straight.
Cheers
:smile:
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C
A graduate student, interested in algebraic quantum field theory (AQFT), axiomatic quantum field theory, and mathematical physics.
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Starknakdfopsy
New here and looking for like minds.
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AlexB23
AlexB23
Welcome to the forums. Also, nice avatar of a thunderstorm and red sprite from the ISS.
Starknakdfopsy
Starknakdfopsy
Just found the curt response in my email sent to me. Free minds or even friendly minds are not allowed here. I will not return.

Thankyou for responding without banning me.

Sean B.
AlexB23
AlexB23
I was not the guy who did that.
TensorCalculus
Gold Member
2025 Award
Doing Physics :-)
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.Scott
.Scott
If you really want to be an astronaut and you're willing to trade your well-being and perhaps your life for wonders and glory, make sure you let SpaceX know. It is reasonable to expect that they will be sending hundreds to Mars over the next decade or two.
In school, I was also "abysmal" in sports. But even then, I could climb a tree like a monkey and easily bike 40 miles any day. Since then I have tried out several aviation "sports" and I walk 6 miles a day.
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.Scott
.Scott
Despite my age (71), my fitbit says my resting heart rate is that of an athlete.
In a hypobaric chamber exercise (years ago), I was able to outlast 15 other pilots (mostly military) before I needed to put my oxygen mask back on. The exercise involved trying to answer test questions at 40,000ft with no supplemental O2.
So I wouldn't use that "abysmal" as a serious yardstick for your astronaut potential. First in football is more likely to get you into elected office than into a space craft.
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TensorCalculus
TensorCalculus
okay that is very impressive...honestly I can barely bike 5 miles let alone 40 though :(
For now the path is astrophysicist BUT you have made it seem a bit more feasible now! And giving up my life for going into space... well... as of right now - I'm more of a fan of trading my life and every last scrap of my sanity for studying and knowing more about space instead XD
E
Gold Member
Equation Sheet:

$$ 0 = \frac{ d}{dt} \int_{cv} \rho d V\llap{-} + \int_{cs} \rho ( \boldsymbol {V}\cdot d \boldsymbol{A} ) \tag{mass}$$
E
erobz
$$ \sum \boldsymbol{F} = \frac{ d}{dt} \int_{cv} \rho \boldsymbol{v} d V\llap{-} + \int_{cs} \boldsymbol{v}\rho ( \boldsymbol {V}\cdot d \boldsymbol{A} ) \tag{Momentum}$$
E
erobz
$$ \dot Q - \dot W_s = \frac{d}{dt} \int_{cv} \rho \left( \frac{V^2}{2} + gz + u \right) d V\llap{-} + \int_{cs} \left( \frac{V^2}{2} + gz + u + \frac{p}{\rho} \right) \rho \boldsymbol {V}\cdot d \boldsymbol{A} \tag{Energy}$$
berkeman
berkeman
Hi @erobz -- do you still need this? It's probably better to store such LaTeX helper sheets locally on your computer.
Jay222
ChatGPT isn't always right, I agree with that !! But it and others like it, are well beyond the early "chatbots" and can be successful in many applications. Vetting is clearly always needed rather than just accepting everything ChatGPT says without review and careful proofreading/copyediting. This URL links to discussion of ChatGPT as compared to early "dumber" chatbots. https://research.aimultiple.com/chatbot-vs-chatgpt/
Jay222
Jay222
Also of course, ChatGPT and similar AI systems are improving VERY rapidly, so their potential future abilities shouldn't be underestimated. That's just obvious.