Hello! My name is Marcus.
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Man in flesh, Kid in thoughts, Nerd at heart
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TIE Model Labs berkeman TIE Model Labs wrote on berkeman's profile.
i dont know if you're reading my messages or just brushing me off as another crackpot. However my new paper has uploaded today on my Metric Slip-Drive Technology.
I promise it will be an interesting read! [Unacceptable reference redacted by the Mentors]
I promise it will be an interesting read! [Unacceptable reference redacted by the Mentors]
Hello, I’m a first-year Computer Science student curious about ocean mapping. Could a distributed network of surface sensors (on buoys or ships) send small acoustic or seismic-like waves to the seabed and use the reflections to map the ocean floor, with data sent to satellites? I also wonder if algorithms like Kruskal’s could help optimize communication between sensors in such a network. I’m still learning and would appreciate feedback.
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ahauck Greg Bernhardt ahauck wrote on Greg Bernhardt's profile.
Greg-
This is an excellent piece on the CHSH inequality violations. Bell's analysis, in conjunction with the Clauser-Aspect experiments, make it clear that local realism is untenable, and that Nature must effect some kind of superluminal global coordination. Gell-Mann was famously unsurprised (It only proves what we've known all along - that quantum mechanics is correct. Big deal.) But I think that Gell-Mann was dead wrong not to be surprised. What is your position?
This is an excellent piece on the CHSH inequality violations. Bell's analysis, in conjunction with the Clauser-Aspect experiments, make it clear that local realism is untenable, and that Nature must effect some kind of superluminal global coordination. Gell-Mann was famously unsurprised (It only proves what we've known all along - that quantum mechanics is correct. Big deal.) But I think that Gell-Mann was dead wrong not to be surprised. What is your position?
berkeman
Why are you asking Greg about this? He is the owner of PF, not one of our Science Advisors. You did not quote the text that you were asking about -- was it from an Insights article that Greg posted on behalf of a Science Advisor author?
Hi . I read in class 7 from Bangladesh and I secured 1st place in Bangladesh physics Olympiad (BdPhO) in category A
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I was posting a response to you when that thread closed. Here it is (500 characters at a time):
If that is a philosophical definition, as you claim, then what is the physics or physical sciences definition?
If that is a philosophical definition, as you claim, then what is the physics or physical sciences definition?
Amazed said:I am not presuming any so-called perfect information at all. I am also not sticking to that definition at all. Why did you presume that I am not seeing the difference between a philosophical discussion and a scientific one?
.Scott
Amazed said:you appear to be taking my open questions, always asked from an open perspective, completely off track and off topic. Physics and deals with what is measurable and what is observable. So, what is the agreed upon and accepted word or term here for 'that', which all matter, space, and energy considered to be as a whole can or could be observed and measured? If the word and term 'Universe' does not suffice, then what word or term does?
.Scott
It really depends on what you are trying to measure, observe, or analyze. As you may have noticed in the Einstein example above, you get to improvise. In general, a Physicist will look at the experimental results, perhaps find some patterns, and form some ideas. Then they will find a way to communicate those ideas. So it's the subject matter that precedes the definition.
.Scott
There are terms that are pretty fixed. For example, if you talk about a "Newtonian universe", most will immediate envision a 3D Cartesian coordinate system with Euclidean geometry and very simple and deterministic physics. You can say "Schwarzschild black hole" and every knows that's the model you get with General Relativity and no angular momentum. Those terms have very specified stories behind them. "Universe" isn't one of them.
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neilparker62 chwala neilparker62 wrote on chwala's profile.
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.
neilparker62
Ok - so what I was thinking of doing is writing a short article on one of your many interesting posts and subsequent threads.
https://www.physicsforums.com/threa...riangle-given-some-extra-information.1063874/
https://www.physicsforums.com/threa...riangle-given-some-extra-information.1063874/
neilparker62
It will highlight your solution as well as illustrate a treasure trove of underlying geometry 'dug up' by AI. I will include an introductory paragraph saying I'm writing it as a reference example for the many contributions you have made on PF.
chwala
Thanks @neilparker62
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
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.
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,
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.
sharps4590
"I am the way, the truth and the life. No one comes to the Father but through me". John, 14:6
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sbrothy sophiecentaur sbrothy wrote on sophiecentaur's profile.
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.
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.
sbrothy
I even have a registered company "Odense Metallurgy, Electronics, Chemistry & Computing". It kinda covers everthing! 

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.
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
Yes, I thought so to but his got his privacy set so that's a no go.
Mentor
Mass of atoms and nucleii from binding energy and KE: https://profmattstrassler.com/2024/...-proton-is-greater-than-the-sum-of-its-parts/
Thank you for speaking up for me. I really appreciate it. I just want to ask questions and learn — glad someone saw that.
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
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
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
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
ChrisF
i happily just got accepted for research gate to :)
My name is Nerissa,and I'm from China. I'm a new member. Please give me more advice.
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.
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
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.
okay wait i know how to
UMM guys sorry how do i post??
Gold Member
2025 Award
Leading a hackathon tomorrow... so scared... but also super excited :)
berkeman
Awesome! You will do great -- have fun! 
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...
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!!!
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!
Hi! Looking forward to understanding the calculus of skid marks!
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
Just what I wanted to know.
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Baakii Greg Bernhardt Baakii wrote on Greg Bernhardt's profile.
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!
berkeman
Welcome to PF. 
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.
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
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
Retired engineer.
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Currently a Freshman in College

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