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2d
comment Work-Energy Problem
try solving the problem, with gravity, Normal force acting on the bead. You know the expression for the centripetal force. You know the velocity of the bead at an angle using conservation of energy. So you can compute when the Normal force becomes negative given the angle, velocity.
Feb
3
comment Time Travel Plausible?
@CuriousOne : Did you comment sarcastically ?
Feb
3
answered Work-Energy Problem
Dec
22
awarded  Yearling
Dec
22
comment Superposition State in Coin Toss
@CuriousOne : Well, it's up to you if you like that approximation or not. Atleast I never came across a counter example where this approximation fails to give the correct result. I didn't get why you say "occasionally gives the right results".
Dec
22
comment Superposition State in Coin Toss
Sorry for being lazy, I meant $|H| >> \hbar $, the magnitude of a classical hamiltonian times t is way bigger than $\hbar$.
Dec
22
comment Superposition State in Coin Toss
@CuriousOne : When i am taking $\hbar \rightarrow 0$, I mean that $|H| >> \hbar $, and the $H$ here involves the entire environment which is generally classical, like the floor, wind, etc. All these things can be neatly approximated as decoherence.
Dec
22
comment Superposition State in Coin Toss
@SubhadipRoy : Yes you can take them to be an equal superposition.
Dec
22
comment Superposition State in Coin Toss
Obviously no. As you evolve you act it upon the states by $e^{iHt}$ and since it is a classical object you need to take $\hbar \rightarrow 0$ limit.
Dec
22
answered Superposition State in Coin Toss
Dec
16
answered Why the word “measurement” all the time?
Nov
18
accepted Entanglement Entropy
Nov
18
comment Supersymmetric Sigma Model
@DanielSank : My apologies, I shall enter the equations from now on.
Nov
5
awarded  Nice Question
Oct
15
accepted Supersymmetric Sigma Model
Oct
6
asked OPE of parity even theories in CFT.
Sep
30
awarded  Notable Question
Sep
14
accepted Introduction to string theory
Jul
9
comment Is there a maximum number of fixed points that a QFT can have?
@SM Kravec : But I thought the continuous line of fixed point comes in the limit of $N \rightarrow \infty$.
Jul
8
asked Is there a maximum number of fixed points that a QFT can have?