Asymmetry Definition and 66 Threads

Twin "Paradox" with no asymmetry Here is another variation of the twin paradox. Suppose we let both twins start their journey from a space station far from any heavenly bodies, so that the whole experiment can be carried out in free space. The twins Jack and John are equipped with identical...

Hello all, I am writing an article on symmetry in the living vs. non-living worlds, and I am looking for inorganic/non-biological examples of asymmetrical structures or relations at the molecular level and higher, similar to the kinds seen in biological systems. For example: The natural...

Suppose that we have an ellipsoidal shell of particles, all initially at rest in some frame, which are going to collapse to form a black hole. Since the cloud has a nonvanishing mass quadrupole moment Q, and Q is varying with time, we should get gravitational radiation. First let's consider...

Do you know things like the back of your hand? How well do you know the back of your hand? I noticed the veins on the backs of my hands are asymmetrical. On both hands I have 3 large veins, one coming from between each pair of fingers. By the time they reach my wrists, they have converged...

anyone know what research is being done in CP symmetry violations and Matter Antimatter Asymmetry currently?

Anyone knows at what time after big bang, baryon asymmetry happened..i read in Simon singh's book "Big Bang" that there was more mater than antimatter when the temperature of universe was 10^15...anyone knows about the time at which it happened?

I have a question from which you should notice that I do not have much of a clue abot group theory. At least not yet. The question is about that many introductory articles about group theory seem to refer to the use of group theory with rotations of bodies and their related symmetry. What...

I am confused with baryon asymmetry and conservation of charge..we say that there is baryon asymmetry but the universe is neutral..how is that possible..if there is baryon asymmetry then there should be charge asymmetry also? I think i am missing some point..can someone explain these two in...

I had a thought the other day regarding this "mystery". First, assume MWI is true (for the sake of the argument). If MWI is true, then all universes that have some probability of existing given the initial conditions of the big bang do exist. Now imagine that the symmetry between matter and...

I ran across the following statement, in a tutorial on logic, If R is an asymmetric relation then R is antisymmetric. Perhaps, the above is true. I will attempt to argue it is not. Okay, then suppose R really is asymmetric, for example the relation (<) So for an arbitrary (c,d) c < d...

I understand the following: The cross section \frac{d\sigma}{d(cos \theta )} (e^+e^- \rightarrow \mu^+ \mu^-) \propto 1 + cos^2 \theta for a purely vectorial (electromagnetic) interaction. Hence \sigma is expected to be symetric in cos \theta. The axial vector (weak) coupling of the Z...

Its said that matter is more abundant than antimatter in observable universe and hence comes the baryon asymmetry...but why matter and antimatter should be equal in amount...which law governs this?

Hello, FCC metals experience significant tension-compression asymmetry because of the comparatively limited number of slip systems that act under compression, compared to tension, right? Thanks, -scott

The arrow of time is a most common example of an overall direction in physics, although Newtonian, relativistic and quantum physics do not derive a preferred symmetry. If chaos also fails here, is there any alternative mathematical description of nature that allows a representation of a...

Meteor just posted a link in the "surrogate sticky" LQG referemce library to an article by Parampreet Singh. https://www.physicsforums.com/showthread.php?s=&postid=142798#post142798 A propos of Singh, he has had several interesting articles recently relating LQG and the big bang---using Loop...

I recall that in their most basic form, quantum mechanics and relativity do not distinguish between past and future. That is, they are each symmetric with respect to time. How then does a unified theory account for temporal assymetries in nature without introducing new physics? Can one...