Recent content by arroy_0205

I agree that an average student should be able to do the calculations but perhaps at initial stage he or she may need some assistance. (At least someone like me would need.) I would consider standard qft books at the level of Peskin and Schroeder.

Can you suggest any source available on internet which may be particularly helpful for those studying/brushing up knowledge of classical or quantum field theory without help of any teacher or friend? Some calculations are at first not so straightforward and there are many types of calculations...

Homework Statement I need to approximate the number 14.45 to nearest integer. Homework Equations The Attempt at a Solution If I remember correctly, to approximate a decimal up to say 2nd decimal place, I look at the third digit and if this is greater than or equal to 5, then I...

It is generally stated that observed baryon to photon density (about 6.1x10^(-10)) is too small. What is the reason? What ratio is expected?

I am asking this question here rather than in some other forum assuming most of those interested in HEP visit this forum. I personally believe that high energy physics attempts to find answers to some of the most fundamental questions in nature and hence spending huge amount of money for this...

It would be interesting to see if there is an example where a problem can be solved both perturbatively and non-perturbatively and to check if these give same results. Also in case of perturbative calc we should see upto what order the results are same. Perhaps for harmonic oscillator we can do...

Thanks for the responses. However I still do not understand why it should matter whether the parameter we are talking about is dimensionless or dimensionful.

I read somewhere that one power of string theory is that there is no adjustable dimensionless parameter in the theory. Why is this considered a strong point in favour of string theory? Second, how does the theory help in solving cosmological constant problem? Again there is no adjustable...

1. I read that the picture of gauge bosons as mediators of interaction originates in and is valid in perturbation theory. But how do we know that picture is correct? We do perturbation theory only because we do not know how to study a system in a fully non-perturbative way. If someday we...

Many journals encourage authors to use their special latex packages (e.g., revtex4-1 for physical review a,b etc) while sending an article for peer-review process. I am not sure if this is compulsory or optional. Will an article be rejected if it is written not using the special latex packages...

The usual overhead power distribution wires are said to have potential of 230V in a certain locality. (These are voltage levels in wires seen along streets electricity pillars and these enter house of consumers.) How does one calculate magnetic field and electric field produced by the wire at a...

Suppose a given second order linear differential equation has two different solutions; then it follows that their linear combination is also a solution. If y_1(x), y_2(x) are two solutions then y(x)=a_1y_1(x)+a_2y_2(x) is also a solution where a_1, a_2 are two constants. If we consider the...

There are several online materials on general relativity. Here I would like to get suggestions about concise review of general relativity at somewhat advanced level. The idea is that this should be enough for recapitulating the area at advanced level by somebody who had studied it thoroughly...

How does one take into account the fact that volume of a solution increases upon dissolving solute? which volume should be taken as the net volume, the volume of solvent to start with or the full volume of the solution? Suppose I add 20gm of sugar in 100cc (or ml) of water. After sugar...

Does it make sense to say that the universe has an edge/boundary? Neutrinos are moving all the time with practically no interaction i.e., unimpeded. Where are these reaching after a very long time (t->infinity)?