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I'm a physics grad student just trying to figure out all this stuff like everyone else.


Aug
23
comment Photons and uncertainty principle
I don't get the feeling you we agree yet. My point is that all you have said so far is that you have some 'ideal photon source' but you haven't said how it works. If you tell me how it would work we can discuss it, but otherwise you are just asserting that something like it exists, but not how it would create a photon with no uncertainty. I have given an example of how you would actually create a single photon state.
Aug
22
comment Photons and uncertainty principle
Furthermore momentum and direction aren't complimentary observables. When you create something with well-defined momentum along the x axis, and well defined position along the y and z axis you might say it 'has direction' in the x direction but it will have very ill defined position along on the x axis and ill defined momentum along the y and z axis.
Aug
22
comment Photons and uncertainty principle
Your ideally perfect gun only exists in your head though. Think about how you are going to create the photon at the fundamental level. For example, you could have an atom that drops from a higher to a lower energy level and emits a photon. The model that governs this process is a quantum mechanical one, so it won't create classical particles, it will create quantum states that have some spread in p and x.
Aug
21
answered Photons and uncertainty principle
Aug
21
revised Acting the Hamiltonian operator on a function
added 11 characters in body
Aug
20
comment Why do photons travel?
Are you asking why photons travel at all? Or why they travel at the speed of light?
Aug
20
answered Acting the Hamiltonian operator on a function
Aug
17
comment What are some significant contributions of string theory to other fields of physics?
Possibly relevant profmattstrassler.com/2012/08/15/…
Aug
15
comment A relative time dilation paradox.
'he will receive signals prior to the appointed minute' - what exactly do you mean by this? Whether you take Special Relativity into account or not, you always need to account for the time it takes a signal to get from A to B.
Aug
14
revised Which Schrodinger equation is correct?
added 172 characters in body
Aug
14
answered Which Schrodinger equation is correct?
Aug
2
comment What would the universe be like if Electroweak symmetry were unbroken?
@FrankH - The short answer is because of QCD there is still a $<q \bar{q}>$ condensate. I am pretty sure the following questions encompasses yours, so I'll flag it as such. physics.stackexchange.com/questions/31395/…
Aug
2
comment What would the universe be like if Electroweak symmetry were unbroken?
You might want to clarify your question a bit - even if the higgs wan't unstable QCD would still break electroweak symmetry. So do are you asking about the world where the higgs isn't unstable or the world where the higgs isn't unstable and there isn't QCD?
Aug
1
comment Is spacetime discrete or continuous?
This is bound to generate comments and answers where people say that discrete space-time can never be Lorentz-invariant. I have no expertise and no opinion on the matter, but I'd like to do my part to throw gasoline on the fire and point out that some people claim that a 'Poisson sprinkling' of space-time points is Lorentz invariant. en.wikipedia.org/wiki/Causal_sets
Jul
28
comment What is unification, unified interactions, or dualities between interactions?
The strong force hasn't been unified with the electroweak interaction via the Standard Model in any way. Within the Standard Model I would just say they 'coexist' like neighbors might, but aren't related in the deeper way that electric and magnetic forces are unified into electromagnetism, or that electromagnetism is further unified with the weak interaction in the electroweak theory.
Jul
27
revised Explanation for $E~$ not falling off at $1/r^2$ for infinite line and sheet charges?
edited body
Jul
27
comment Do other particles besides scalars admit tachyonic solutions?
The second bounty is for jjcale. Other people can add answers to it, but I don't think I will be awarding any of there bounties for this question.
Jul
27
awarded  Benefactor
Jul
27
comment Do other particles besides scalars admit tachyonic solutions?
I started a second bounty to give to you for the reference, there is just a waiting period before I can assign it.
Jul
27
revised Explanation for $E~$ not falling off at $1/r^2$ for infinite line and sheet charges?
added 49 characters in body