The definition tag is used in situations where the question is either about how some term or concept is define or where the validity of an answer depends on a subtle definition of some term or concept used in the question.
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1answer
101 views
Reality constraint
What is the "definition" of a reality constraint and why is it called that way?
(I mean how it is used for example in quantum field theory and string theory)
1
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1answer
77 views
A physical sense of an Inertial frame
Definition clarification needed, please: I am hoping to get physical sense of an "inertial frame".
Do inertial reference frames all have zero curvature for their spacetime?
So is an inertial frame ...
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0answers
65 views
Motivation For Definitions [closed]
I noticed in my physics textbook that we define certain relationships to be true. I can see how this is considerably helpful in deriving other relationships from these definitions; for instance, take ...
1
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1answer
78 views
Two definitions: 'semi-classical space-time' and 'supersymmetric Minkowski space'
By reading articles I ran several times into two terms, never being defined so I assume they must have well established definitions somewhere.
The first is semi-classical space-time. If I where to ...
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6answers
2k views
What distinguishes between physics and chemistry? [closed]
What are the major differences between physics and chemistry? I know that they both study atoms, electrons and molecules, but what makes some topics part of one and some part of another?
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2answers
97 views
Definitions of Lagrange points: $L_4$ and $L_5$
We have the the five Lagrange points (let consider Earth and Sun):
$L_1$ - lie between Sun and Earth;
$L_2$ - beyond the Earth;
$L_3$ - beyond the Sun;
And what's the difference between $L_4$ and ...
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2answers
77 views
Definition of Static Electricity
The result of an imbalance of electrons between objects is called static electricity. It is called "static" because the displaced electrons tend to remain stationary after being moved from one ...
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votes
1answer
215 views
Mathematical definition of Bogomol'nyi–Prasad–Sommerfield (BPS) states
What is the mathematical definition of Bogomol'nyi–Prasad–Sommerfield (BPS) states, independent of any specific physical theory.
0
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1answer
56 views
What is the difference between Feshbach resonance and Fano resonance?
What is the interpretation of "resonance" in Feshbach resonance and Fano resonance?
What is the difference of Feshbach resonance and Fano resonance?
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2answers
155 views
Definition of electric charge and proper explanation
Is there a definition of electric charge and proper explanation of it?
It is said "Electric charge is the physical property of matter that causes it to experience a force when close to other ...
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votes
1answer
113 views
What would it take for a physical phenomenon to be telekinetic?
I've just watched an episode by MinutePhysics called "Real World Telekinesis". In it, Neil Turok (I wonder if that is his actual name; I remember playing a game called "Turok: Dinosaur Hunter" on ...
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1answer
89 views
Why the kilogram is not defined? [duplicate]
Possible Duplicate:
Why do we still not have an exact definition for a kilogram?
I was thinking about SI units. I found the following definition for the base units:
Meter: distance ...
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1answer
352 views
Wave packets v.s. wave trains
Could someone please explain the difference between a wave packet and a wave train? I have rummaged around online but have not been able to find a definitive definition.
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1answer
279 views
Energy versus free-energy diagram
Energy versus free energy diagram. I haven't been able to find an adequate definition of these two terms in relation to each other. Could someone point me in the right direction, please?
From Borrell ...
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3answers
82 views
How would you determine whether an object is at equilibrium? [closed]
How would you determine whether an object is at equilibrium or not?
What is the definition of equilibrium?
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votes
2answers
40 views
Viewing a reference frame from inside of it?
Can one observe one's own frame of reference without moving out side the frame?
For example, if you are on a train and you throw ball in the air up and down.
When you are on the train (frame 1) you ...
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0answers
82 views
Curvilinear abscissa confusion
How's exactly defined the curvilinear abscissa in kinematics? Surfing on the net I found different definitions:
a) Fixed a point $O$ and a direction, the curvilinear abscissa $s$ at a point $P$ is ...
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0answers
202 views
How is the term “Born level” usually defined?
How is the term "Born level" usually defined, e.g. in talking about the $pp\to Z/\gamma^*\to e^+e^-$ cross section at Born level?
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0answers
20 views
Rice Allnatt distribution function
Can anyone give me an article of which explains Rice Allnatt distribution function or can you explain the function here?
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3answers
2k views
Difference b/w Kinetics & Kinematics w/concrete example
(I know whether I understand this or not doesn't matter much to my work & study but am just curious.)
I still can't differentiate in my head kinetics and kinematics (similar thread is found but ...
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3answers
322 views
Are we crystals?
Can we say that we are crystals because just like crystals we are made up of very small unit (cell) making up almost the same shape (our body) everywhere.
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votes
1answer
106 views
Poles, wavefunctions, transmission
Why is it said that $\operatorname{sech}x$ (a transmission amplitude) has a simple pole on the imaginary axis? Thanks.
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votes
0answers
142 views
What's the definition of Heat Flux Vector? [closed]
I am not content with the statement that heat flux is the quantity per second per area. I deem that there are many mathematics details omitted here. I want somebody help to express it clearly.
Fist ...
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votes
2answers
69 views
Do physics laws really apply to anything? [closed]
My professor said that a law was stated and announced as a law because it happens in our everyday life. He gave us an example of Newton's 3 laws. He said that walking possess 3 laws of Newton's. Is ...
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votes
0answers
73 views
What do $\hat{h}$ and $\hat{g}$ mean in the Ising model?
I'm an undergraduate student learning the Ising model, but can't understand what the unit vectors $\hat{h}$ and $\hat{g}$ are, in the general interaction between two spins.
...
