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I've heard an argument that the question of smallness of QCD $\theta$ parameter is called the problem (namely, strong CP problem), since the other dimensionless couplings (like $\alpha_{s}$), are of order … If I'm right, what is the correct formulation of the strong CP problem? If not, how to relate $\theta$ and $\alpha_{s}$? …

Are the terms "$n$-body problem" and "many-body problem" synonymous? Or does one refer to a numerical problem an the other to an analytical problem? …

According to this Wikipedia article on cosmic inflation: The magnetic monopole problem, sometimes called the exotic-relics problem, says that if the early universe were very hot, a large number of very … So why is the "monopole problem" such a problem in the first place? …

Both in this book and the Wiki page mention briefly how this theory of inflation can possibly solve Flatness Problem, Horizon Problem and Monopole Problem. … How does an inflationary universe solve the Flatness Problem, Horizon Problem and Monopole Problem? …

Is the measurement problem an interpretation problem or a practical problem? … If the measurement problem is an interpretation problem, then there is no experiment that we can perform which can give a definitive answer to the measurement problem. …

Here I describe an example how a 1D problem can be solved easier by considering a mathematically equivalent problem in 2D. … Problem: Find the equation of motion of particle in 1D space with the potential $V(x)=\frac{A}{x^2}$ Normal Solution: Conservation of energy $$\frac{m\dot x^2}{2}+\frac{A}{x^2}=E$$ then derivative …

There have been a bunch of questions related to the hierarchy problem, but I still can't help but feel that an assumption is being made that is not backed by any example of correctness and is thus potentially … My understanding of the hierarchy problem is the following: in the context of the standard model thought of as an effective field theory with some cut-off $\Lambda$ (typically thought of as being far above …

My question arises from a classical mechanics problem from a Hong Kong physics training programme: This is not a homework question as I am not asking about how to solve the problems in the image. … I guess that taking the limit $\alpha_0\to\frac\pi2^-$ would avoid the infinity problem, but I have no idea how can this be implemented. How can I avoid the divergence and obtain $\alpha(t)$? …

This is called the flatness problem, but I am having a hard time understanding why it is a problem. … If $k$ was shown to be exactly $k=10^{-100}$, I understand that we would have a fine-tuning problem. …

I'd need help with this problem: In a nutcracker a walnut is placed 5,0 cm from the fulcrum. To crack the nut in that position you must apply a 120 N force. … The translation of this problem is not very clear at best. …

I was doing a problem in thermodynamics where the net heat is 0. … This problem was to work out the final temperature of the system. Why was the initial 90 °C of the added copper substituted with $ T_{f} $ in the heat equation? …

How can I set up this problem? … I am just a grade 12 student and this is an exam problem. To me this problem seems extremely complex, so am I missing out on something? Does the problem have a trivial solution? …

I had asked this problem earlier but I was too vague in how I asked it so I'm making a new post to be more specific. … Problem: Say we have a series circuit with an ammeter, a cell with internal resistance and known emf, and a 10 ohm resistor. It is noticed that the resistor gets warmer. …

Usually, I find it easy to understand the concepts and explanations, but I have particular difficulty in understanding the premises of why the CMB observation leads to the horizon problem. … My problem is: where does the premise come from that primordial space should have different temperatures in each region? My mental image is of a singularity that starts the big bang. …

The "Ozma problem" was coined by Martin Gardner in his book "The Ambidextrous Universe", based on Project Ozma. … It is claimed that the classical experiments with magnets, electrical currents, light polarization, gyroscopes etc. can't solve the problem. …