Category theory is a branch of mathematics which attempts a formalization in terms of simple elements and associations between them. A rather abstract construction, indeed, and certainly one above my head (I am an experimentalist, for god's sake!).

Nuclear Glue

The nucleus of an atom is made up of protons and neutrons.  Both have about the same weight although protons have a positive charge and neutrons have no charge (they are neutral).  Like charges such as protons produce a repulsive force against each other.  This then begs the question, what holds the nucleus together then if these positively charged protons are all pushing each other away while being crammed into the nucleus together?

Just a short post to remind anybody who has successfully completed a master in scientific disciplines that there is a chance to do research with the CMS experiment at CERN, earning a PhD in Physics or Statistics and becoming expert with Statistical Learning techniques, while being paid a salary much higher than mine.
        The SM neutrino hierarchies are special
This morning I received a copy of the book "WHAT NEXT ? White Paper of CSN1", a publication of the Italian INFN (National Institute for Nuclear Physics) addressing the question of what awaits us after the Higgs discovery, and what projects should be supported in the long-term future of HEP.
The book is the result of one year of work by many colleagues who have actively participated in four working groups and one task force, producing some preliminary studies of the discovery potential of this or that machine, and of the most important questions that need to be answered -and the projects that appear more suited to answer them. Editors of the work are Franco Bedeschi, Roberto Tenchini, and John Walsh.

The working groups were thus titled:

I was at the ICNFP 2015 Conference, spending two nights to prepare updated versions of two posters following an idea that I had on August 22 just before taking the plane for Crete (the possible space-time contradiction between the preonic vacuum and the macroscopic world, leading to Quantum Mechanics for standard matter), when an important result was posted to .

The scientists behind the BICEP2 (Background Imaging of Cosmic Extragalactic Polarization) telescope, last year made an extraordinary claim that they had detected gravitational waves, which are ripples in space-time. Initially hailed as the most groundbreaking discovery of the century, it later proved a false alarm: the signal was merely galactic dust.

So are we likely to ever find gravitational waves? And would they really provide irrefutable evidence for the Big Bang? Here are five common myths and misconceptions about gravitational waves.

The existence of parallel universes may seem like something cooked up by science fiction writers, with little relevance to modern theoretical physics.

But the idea that we live in a “multiverse” made up of an infinite number of parallel universes has long been considered a scientific possibility – although it is still a matter of vigorous debate among physicists. The race is now on to find a way to test the theory, including searching the sky for signs of collisions with other universes.

The title of this post is also the title of a self-published book by George Triantaphyllou, a greek physicist whom I met two weeks ago in Kolimbari, when we attended the ICNFP 2015 conference. I had met George at the same conference three years before, and this year we had some time to chat during a nice excursion in a botanical garden near Chania and at the conference dinner. As he was kind enough to offer me a copy of his book, I thought I would relate about it here today.

The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory smashes large nuclei together at close to the speed of light to recreate the primordial soup of fundamental particles that existed in the very early universe. Experiments at RHIC have shown that this primordial soup, known as quark-gluon plasma (QGP), flows like a nearly friction free "perfect" liquid. 

New RHIC data just accepted for publication in the journal Physical Review Letters now confirm earlier suspicions that collisions of much smaller particles can also create droplets of this free-flowing primordial soup, albeit on a much smaller scale, when they collide with the large nuclei.