
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:38 AM
ZapperZ

1 
36,825 
Suppose, i want to diagonalize operator A by matrix S (A'= S^\\dagger A S). Do i need to form S from "NORMALIZED"...

Sep2010 10:50 PM
Parlyne

1 
813 
the quantum unit of LUE is umolco2m2s1
how can i change it to energy unit ,like gC/MJ
i have been puzzle for many...

Sep2010 10:08 PM
amelynn

2 
872 
The angular momentum operator is given by
\bold{L}=\bold{r}\timesi\hbar \bold{\nabla}
How do we compute
...

Sep2010 08:35 PM
Meir Achuz

7 
955 
So I've been reading up on some quantum tunneling. It seems as though everything I read on it only conveys an...

Sep2010 08:19 PM
Drakkith

9 
1,310 
I am a second year student in quantum mechanics. I heard in lecture that simultaneous diagonalization of matrices is...

Sep2010 08:16 PM
Abrar Quadery

4 
4,875 
Does a positron absorb a photon like an electron does? When an electron absorbs a photon it increases in energy, but...

Sep2010 06:15 PM
filegraphy

2 
997 
i'm trying to learn qft. i have referred many books most of them have same pattern giving some intuitive idea followed...

Sep2010 09:51 AM
unusualname

3 
1,771 
I'm looking for a book that would explain/enlighten me about the current events in quantum physics/string...

Sep2010 12:39 AM
arkajad

1 
610 
Hello,
While other's on this site are probably considerably older than myself, as I am only a grade nine student, I...

Sep1910 06:04 PM
jswu1996

4 
980 
I have a quite simple doubt.
One of the practical applications of Heisenberg's uncertainty principle is given by...

Sep1910 11:25 AM
arkajad

5 
1,100 
Hi guys,
Quantum mechanics gives welldefined probabilistic predictions for the value we get when we measure...

Sep1910 02:16 AM
arkajad

6 
2,449 
Can quantum physics measure our thoughts and emotions? Is there or if any a formula to measure this energy? I was...

Sep1910 01:30 AM
Slidingby

21 
3,034 
I was reading today about de Broglie and I don't think I really get what is meant by particles having a wave...

Sep1810 07:54 PM
brainstorm

9 
2,367 
I wonder if Heisenberg principle (both \Delta p \Delta x \geq \frac{\hbar }{2} and \Delta E \Delta t \geq \frac{\hbar...

Sep1810 06:14 PM
calhoun137

3 
731 
I was wondering if light from distance stars actually get weaker the more they travel through space? I'm not really...

Sep1810 12:58 PM
Parbat

10 
1,219 
I could benefit from someone shedding some light on a couple of questions that I have regarding the speed of various...

Sep1810 12:13 PM
calhoun137

9 
8,760 
This is probably my misunderstanding of the notation...
The definition of a density matrix is in the attached file....

Sep1810 10:34 AM
calhoun137

4 
2,153 
Most of the literature that I have read on nonrelativistic wave mechanics discusses experiments that measure a...

Sep1810 09:46 AM
sweet springs

18 
4,089 
Is there any way of proving <p> = 0 for a discrete (bound) state given it's wave function? I've seen proofs using the...

Sep1810 03:04 AM
Petr Mugver

7 
1,580 
Is a quantum computer (a full fledged working) really possible..??

Sep1810 01:25 AM
Eynstone

1 
750 
Dear guys,
Have you ever met this kind of tensor expression?
A_{} C_{c]}
That is, indices a, b are...

Sep1710 08:59 PM
ismaili

2 
1,365 
If I slowly lower a book to a table from a height of say 1 m, it is at some point, 0.5m away, then 0.4 m away, etc.,...

Sep1710 03:48 PM
DaveC426913

8 
1,342 
The Pauli equation (seen here) contains its spin dependence in the term which reads
\frac{1}{2m}\left^2
So let B...

Sep1710 10:27 AM
pellman

8 
4,647 
Hello, I'm new to the community here at Physics Forums. I am an undergrad double majoring in mathematics/computer...

Sep1710 09:31 AM
NetMage

30 
1,841 
(First: to the moderator: I am not sure if this should go here or in general relativity, because it spans both...

Sep1710 06:11 AM
nomadreid

15 
1,334 
Have Zernike Polynomials ever been applied to Schrondinger's Equation instead of psi? They're widely used in optics...

Sep1710 02:40 AM
DrDu

1 
849 
i have met a problem about the commutator of x and p.
=ihbar
/p> is the eigenstate of momentum operator p.
...

Sep1610 10:39 PM
lihurricane

3 
1,795 
I am attempting to calculate the commutator where \hat{X} is position and \hat{P} is momentum and am running into the...

Sep1610 07:59 PM
16180339887

5 
3,067 
Hello,
I'm a bit confused learning about how an electron can be found anywhere within the probability density. ...

Sep1610 06:09 PM
alxm

4 
1,650 
This question is from an example taken from Zurek 1991 (Decoherence and the Transition from Quantum to Classical).
...

Sep1610 02:44 AM
arkajad

11 
3,686 
Hi every body,please help me this:
Normally,the correlation function is equal sum of conected diagrams because of...

Sep1610 02:00 AM
ndung200790

0 
613 
I've been exploring an idea for reconciling the possibility of local realism with the various experimental proofs of...

Sep1510 04:38 PM
unusualname

2 
882 
Hi guys!!
When we consider a system composed by two 1/2 spin particle we can label the 4 natural basis vector by the...

Sep1510 03:13 PM
Meir Achuz

1 
4,292 
I may be posting to the wrong forum, if so, please advise. I'm reading a book on rotational symmetry and its...

Sep1510 10:10 AM
quaternion2

3 
3,068 
I would like to understand phase space better, spec. in relation to the quantum Liouville theorem. Can anyone point me...

Sep1510 09:51 AM
xepma

1 
1,834 
There is some quantum digital battery under development which
will allow to store up to temfold times of energy as...

Sep1510 08:20 AM
Stanley514

0 
1,220 
Can someone tell how antiparticles affected by gravitational force? The same way as particles or opposite? Thanks.

Sep1510 07:40 AM
spikenigma

6 
1,033 
Here is a thought experiment to illustrate the problem...
Suppose you have a light source capable of emitting...

Sep1510 02:11 AM
questions,yes

13 
1,734 
I Uwould be grateful if anybody can kindly help me with this particular doubt that cropped when I was working through...

Sep1410 11:36 PM
relativist

4 
790 
Something I've always wondered: You throw matter into a black hole, but get half matter and half antimatter out due...

Sep1410 06:18 PM
bcrowell

5 
1,566 