Questions that ask about some aspect of physics research or study which doesn't involve the actual physics. In general, soft questions can be answered without using physical reasoning.

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1
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2answers
40 views

Has Dirac ever co-authored a paper? [on hold]

Just curious. Not counting PhD theses, books, and review papers, but regular research papers with original ideas.
2
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0answers
65 views

Continuum analogue of $ \langle \psi | \psi \rangle = \sum _i a_i^* a_i$

I'm learning Dirac notation, and I found the following exercise: Verify that if $$|\psi \rangle=\sum_i a_i |i\rangle, \tag{1}$$ (where $a_i=\langle i|\psi \rangle$), with $$\langle i|j ...
0
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1answer
25 views

What is the recommended symbol for Volumetric flow rate? [on hold]

I'm currently working on a paper with a mathematician. He always writes $\dot Q$ as well as $\dot V$ for volumetric flow rate and claims both are standard notations. Till now I always used $Q$ ...
-1
votes
1answer
46 views

How to invent mathematics to find solution to real world problems?(without high level mathematical knowledge) [on hold]

Let's say I want to know how waves are formed when a stone is dropped in water, how trees are deformed by the wind, etc, and I want to invent the mathematical equation to predict the behaviour of ...
4
votes
1answer
141 views

Using a laser to overhear a room conversation

Movies with science based tricks and gimmicks are generally silly and sometimes even annoying. The science based trick that I don't know enough about to judge is the following (and I have seen it in a ...
0
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1answer
44 views

Is it physics that leads to development of maths or is it maths that leads to the development of physics? [closed]

Like calculus(which is maths) was discovered from physics. Are there theories in which maths leads to the discovery of new physics theories? So is it physics that lead to development of maths or its ...
-3
votes
1answer
71 views

Are time and space interchangeable? [closed]

Mass and energy are interchangeable. Does that mean time and space are interchangeable too? Reason for question: The only difference I can comprehend between matter and energy is that energy has no ...
2
votes
2answers
24 views

What S means in S-duality?

As I know, there are many dualities related to S-duality. For example, Montonen-Olive duality, Seiberg duality. and so on. so, I wonder that what "S" means in the term "S-duality". If this is a stupid ...
0
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1answer
26 views

Formula relating sum of values of a function to its integral

I came across the above formula in some quantum mechanics lecture notes explaining the Casimir effect. Anyone seen it before if so could you please tell me its 'name'. B refers to the Bernoulli ...
0
votes
1answer
90 views

How relevant is the Heisenberg Uncertainty Principle?

I was originally surprised to see that, $$\Delta x \cdot \Delta p \gt {{\hbar} \over 2}$$ But, then I realized that $\hbar/2=5.27 \cdot 10^{-35}$. According to this other question, the smallest ...
0
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1answer
60 views

Does energy exist? [closed]

None of this is going to be rigorous or have a right answer, so please don't take it as though I'm demanding one. I'm just interested in everyone's thoughts. It feels to me (and possibly you) that ...
0
votes
1answer
43 views

Can avg. Vel. be zero in uniformly accelerated straight line motion?

A particle moves in a straight line with constant acceleration. The average velocity of this particle in an interval is zero. According to me it may become possible when velocity of particle is in ...
9
votes
3answers
201 views

Why is the $dx$ right next to the integral sign in QFT literature?

I've noticed that in QFT literature, integrals are usually written as $\int \!dx ~f(x)$ instead of $\int f(x) dx$. Why?
0
votes
1answer
37 views

I'm interested in the use of self-similarity in physics. Is this a reputable subject? [closed]

I'm interested in fractals, self-similarity, and chaos. Many physicists disregard these phenomena as candidates to explain the fundamental properties of the universe. However, when I read about ...
0
votes
1answer
80 views

Does the randomness of QM do much in everyday life? How much? [closed]

My apologies if in its current state this question isn't squarely suited here; I've worked it until it seemed reasonably articulate. Feel free to move it if it'd be better received elsewhere. ...
1
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0answers
49 views

How does the moment problem arise in physcs? [closed]

The (finite) moment problem is stated as follows: Given an interval [a,b] and set of reals $\{ \mu_0,...\mu_N\}$ for some fixed $N$ Find real valued function $\rho:[a,b] \to \mathbb{R}$ of ...
1
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2answers
47 views

Do chemical bonds abide by widely accepted geometric principles?

To elaborate, it is mathematically proven that triangles are the strongest shape. I don't know what strong materials there are in the world but I have heard of carbon nanotubes. In the case of ...
0
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0answers
39 views

What is the first topic on mathematics,that an undergraduate physics student must study? [duplicate]

I aspire to become a theoretical physicist. I like to understand about infinite series and so on. Could you please recommend me any book?
1
vote
1answer
70 views

Meaning of the term 'bulk'

I have recently started reading literature on 2 dimensional systems in Condensed matter. While reading, I frequently came across the word 'bulk'. Sometimes it referred to 2-D and sometimes to 3-D. I ...
1
vote
1answer
72 views

Can photons accelerate? [duplicate]

I was just wondering if there's a (hypothetical) situation where a photon could accelerate and what the consequences of this might be?
1
vote
1answer
50 views

Necessity, significance of Spinors

This is an area I am researching at my own pace, general rotations in 3D. I've known about the plate trick for a while as well, and have a very rough understanding of the concept of ...
-1
votes
1answer
50 views

Does this analogy with matter and energy hold? [duplicate]

Matter is to energy as dark matter is to dark energy. Is that statement correct? If not, is there any relationship, that we know of, between dark matter and dark energy? When I say there is an ...
-2
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1answer
38 views

Spin-resolved current [closed]

What is spin-revolved current? Is it the spin current?
0
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0answers
23 views

What's the best way to avoid slipping on ice? [migrated]

Where I live, winter is still a good bit away, but last year I slipped on ice and ended up with a black eye and a broken wrist. This year I sincerely want to reduce the chances of that recurring. I ...
4
votes
1answer
129 views

How is classical information put into and retrieved from a quantum computer?

How, if you had to find the factors of say a 256 digit number, would you go about inputting the data and how do the proper answers "drop out" of a quantum computer. Other than terms such as qubits, ...
4
votes
2answers
46 views

Pointwise and uniform convergence. Examples from physics

I am a first-year mathematical student, and from a mathematical perspective I understand the difference between pointwise and uniform convergence of sequences and series of functions. However, I have ...
2
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2answers
98 views

What is high energy physics?

Is high energy physics the same as particle physics? Does research in high-energy physics include things like quantum gravity, string theory and quantum field theory? Is unifying the four ...
-2
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0answers
33 views

Subject is Maths that would complement Physics? [closed]

Suppose Math has 5 sub parts- Analysis: Analysis, Complex Analysis, Measure theory and integration,Functional Analysis Algebra: Group Theory, Vectors space-rings-modules, Galois, Algebra Number ...
1
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0answers
25 views

Prepare for HEP-th graduate application: books, research opportunities,etc [closed]

I want to specialise in high-energy physics theory. I feel quiet unconfident because the I just knew that the field is insanely competitive, so I really need your advice to guide me a bit, and any ...
5
votes
1answer
92 views

Unification of Weak and Electromagnetic forces

I'm curious how the weak and em forces relate to one another. My knowledge in this area is weak (ha) but I am interested in an explanation for how these two forces relate to one another, and how / why ...
2
votes
2answers
99 views

Mathematics needed for string theory [duplicate]

I'm interested in cutting edge string theory studied by research physicist. I'm wonder what mathematics is needed and how far am I in terms of mathematics background needed and how much more ...
1
vote
4answers
750 views

What exactly is meant by infinity?

What exactly is meant by infinity when I see it in a physics equation (always something wrong?)? And in experiment how many orders of magnitude can be treated as infinity (say, if infinity is ...
0
votes
2answers
47 views

Solid Mechanics book recommendations

I'm searching for a book on Solid Mechanics that explains the topics intuitively (similar to Kline explanations on Calculus: An Intuitive and Physical Approach). Also the book should have the ...
0
votes
2answers
73 views

What is an example of something that in theory thought to be impossible but not anymore? [closed]

I usually tell my parents "it's impossible to go faster than light", but they keep telling me "soon" (soon it will be possible to go faster). I know this is impossible in theory, but how much can I ...
4
votes
4answers
1k views

Which one to learn first: Special or general relativity? [closed]

I am extremely interested in self-learning Einstein's theory of relativity, but I don't know where to start. Can I make general relativity my starting point, and later look at special relativity as ...
0
votes
2answers
63 views

Is escape velocity really a velocity?

The term escape velocity is quite common to us. But we know velocity is a dimension dependent on the direction. But the escape velocity has same value irrespective of from where it is thrown from the ...
3
votes
0answers
107 views

Worthington jets explanation: fluid phenomenon

I don't understand the reason behind the formation of Worthington jets I've been reading a bit about Worthington jets Video 1, this phenomenon is caused when something is thrown to the water as we ...
0
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0answers
49 views

Is this a good explanation of electron mobility to the layman?

I'm writing an informative paper on graphene for my writing class (layman-oriented), and was describing electron mobility in very simplified terms. Let me know if anything is mistaken, badly ...
2
votes
0answers
82 views

Mathematician learning theoretical physics [duplicate]

EDIT: I was aware of the supposed duplicate. But I'm interested in a clear and focused path through the basics to advanced theoretical physics such as string theory - a path that avoids studying ...
0
votes
2answers
54 views

What is the meaning of this definition of potential energy?

The isolated system of particles is being observed. In the coursebook, $\vec F_\mu$ is by definition the vector sum of forces of all other particles acting on $\mu$-th particle. Usually, potential ...
0
votes
1answer
78 views

A course in Lagrangian Mechanics [duplicate]

I would like to know: what are some of the best introductory books to Lagrangian Mechanics?
0
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0answers
31 views

Can anybody recommend a book on quantum physics for a mathematically minded student? [duplicate]

Basically what the title says. I'm a math/physics double major going into my second year, but I'm much more math oriented. I'll be taking a quantum class in the fall and I'd like a book that ...
2
votes
0answers
13 views

Is there any good literature about conceptual designs of Quantum (Micro-) Black Holes Machines?

I did some research and found this book: Quantum Black Holes, 2014 http://link.springer.com/book/10.1007/978-3-642-38939-9 It seems good for a repetition of current status of (Quantum) Black Hole ...
1
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0answers
69 views

From Civil Engineering undergrad to Physics grad [closed]

I am an undergraduate Civil Engineering student. When I finish my undergraduate studies I want to pursue a masters degree in Physics (my ultimate goal is to get a PhD in Physics). Due to limitations ...
3
votes
1answer
118 views

Was quantum mechanics made to fit the Bell violations or they just happen to fit them?

Entangled bipartite states can violate the CHSH inequality upto $2\sqrt{2}$ with suitable measurements. Is it that in nature we don't witness violation of CHSH more than this and quantum mechanics ...
2
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0answers
47 views

Piezoelectric effects of naturally shaped quartz crystal for maximium Q?

Background Based on helpful comments and links here and also from my question on the electronics stackexchange, I have learned that the quartz crystals are nature's transducers of energy, allowing ...
0
votes
0answers
18 views

Need your Kind Recommendations and References Please [duplicate]

I studies Physics in my high school about 5 years back and i have never touched physics after that.I am planning to revise that very soon. I am now planning to do college physics on my own at my home ...
0
votes
1answer
133 views

Are Feynman's Six Easy Lectures still relevant today?

I haven't learned anything about modern physics at the university yet, but next year I will, and in the summer before I thought I would read this book, Six easy lectures from Richard Feynman. It was ...
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1answer
91 views

Envisioning the hottest topics in physics for the next decade [closed]

Last decade was the decade of topological insulators $\&$ superconductors, topological order, tensor networks, topological quantum computation and spacetime= entanglement sort of ideas and many ...
0
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0answers
36 views

When doing E&M problems, I find the extreme exponents annoying. Could redefining the coulomb change this?

When typing into my calculator things like 9e9 or 8.85419e-12 its rather annoying to write in all those exponents (yeah I know ...