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"I would never die for my beliefs because I might be wrong."

-- Bertrand Russell


Jun
4
comment Why the heat flux vector at a point must be perpendicular to the temperature isothermal surface? Is it a definition or a deduction?
See my edit, it addresses this issue.
Jun
4
revised Why the heat flux vector at a point must be perpendicular to the temperature isothermal surface? Is it a definition or a deduction?
added 133 characters in body
Jun
4
answered Why the heat flux vector at a point must be perpendicular to the temperature isothermal surface? Is it a definition or a deduction?
Jun
3
answered Why is the Big Bang the biggest explosion in the universe?
Jun
3
answered Having a problem about entropy, thermodynamics
Jun
3
comment Density of states of a photon gas in volume V and temperature T
Your formula also implies there are only two photons possible in your system. But the thing is photon systems can have an arbitrary number of them. Of course, taking into account quantization, for each frequency or momentum, only discrete multiples of the corresponding energy will be accessible. Also, you are making a computation for the microcanonical ensemble with fixed energy. They are asking for a canonical ensemble with fixed temperature. And since photon number is not fixed, it's even grand canonical.
Jun
3
comment Density of states of a photon gas in volume V and temperature T
To begin with, if $p$ is momentum, why is there an $\hbar$ in your first formula? One should have $E^2-p^2c^2=0$ for photons.
May
26
awarded  Nice Answer
Jan
27
comment Is Dr Quantum's Double Slit Experiment video scientifically accurate?
Maybe you could explain to me what the delayed choice quantum erasure changesto the problem? Because just saying it makes a difference doesn't quite cut it.
Jan
3
awarded  Nice Answer
Jan
1
comment Why is quantum entanglement so important?
I'm sure you're right about what he had in mind. But that should not be for us to guess.
Dec
30
comment Why is quantum entanglement so important?
Unfortunately, your example is not an example of entanglement. It's not even clear to me there are correlations involved. Antiparallel spins can be represented as: $|\uparrow\downarrow\rangle$.
Dec
9
awarded  Constituent
Nov
26
awarded  Caucus
Nov
12
awarded  Yearling
Oct
26
comment When and how do you represent a two body state as a tensor product?
@Jim: Does this help? The tensor product $L^2(\mathbb{R}^3)\otimes L^2(\mathbb{R}^3)$ is isomorphic to $L^2(\mathbb{R}^3\times\mathbb{R}^3)$. And the cartesian product is $\mathbb{R}^3\times\mathbb{R}^3=\mathbb{R}^6$.
Oct
15
revised Schrödinger equation with complex potential
deleted 7 characters in body
Oct
14
comment The equation of a ferrofluid under a magnetic field?
You won't need the full Navier-Stokes equations since the problem is static. Neither will you need the full Maxwell equations. That should simplify the problem a lot. You'll also need equations describing the interaction between the ferrofluid and the field.
Sep
24
comment Can we have discontinuous wavefunctions in the Infinite Square well?
It probably makes sense if you extend the meaning of the Schrödinger equation in terms of distributions.
Sep
15
awarded  Pundit