63,741 reputation
242159
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location Greece
age 75
visits member for 4 years, 4 months
seen 54 mins ago

Retired experimental particle physicist.

The picture is a fayum . It looks like aunts and cousins of mine :).


53m
comment Elements of particle mass
All other masses of compound :baryons, resonances, nuclei atoms etc need the (relativistic-kinematics defined) invariant mass
54m
comment Elements of particle mass
you ask "If so,is the mass of associated with with the Higgs field equal to the mass of the energy required to hold the particles together?" No. The model is thus: at very high( cosmological) energies there is complete symmetry in SU(3)xSU(2)xU(1), which means all the particles in the table are massless. But that zero mass is in a metastable state. see the figure here en.wikipedia.org/wiki/Higgs_mechanism#Abelian_Higgs_mechanism . As the energy falls ( the expansion of the universe) the symmetry is broken and the particles in the table acquire mass. only those.
1h
comment How Uncertainty Principle, Vacumm fluctuations and Energy Conservation coexist in QFT?
Lorenz invariance is built in QFT
8h
comment Elements of particle mass
1) yes . 2)(The energy momentum) four vector gives the invariant mass of a system of particles.3) In the case of a particle in the table, it is is named rest mass. with combinations of particles the invariant mass is the rest mass of the system.4) not the masses, the four vector addition of the four vectors of all within the bag, quarks, antiquarks, gluons. look at the pictures in the link. profmattstrassler.com/articles-and-posts/… . the link is also informative
8h
comment Is there a word for all the particles in an atom?
They usually mean the particles in the table of the standard model, quarks gluons etc by sub atomic.not protons and neutrons: en.wikipedia.org/wiki/Subatomic_particle
8h
comment With the LHC about to restart as max energy, are there absolutely no hints or tantalizing signs of Supersymmetry in previous data?
You are forgetting the inquisition, the second part of , non democratic decisions is true. But my view is more long range, on the lines : bee societies build hives, human societies build taj mahals and Sinic walls. The forces inside the society are different but viewed by an alien intelligence the impetus is there, of collective building , thousands of people working on the project.
10h
answered Elements of particle mass
10h
comment With the LHC about to restart as max energy, are there absolutely no hints or tantalizing signs of Supersymmetry in previous data?
@CuriousOne I view the money spent on large colliders as the percent of their GDP ancients spent in building the Parthenon or the medievals building cathedrals.Such large GDP expenses should be compared to other collective efforts that eat large slices of the GDP, as preparations for war. imo of course
11h
comment With the LHC about to restart as max energy, are there absolutely no hints or tantalizing signs of Supersymmetry in previous data?
@CuriousOne . Not really. The most expensive experiments in the world are carried out during wars and preparations for wars. A single aircraft carrier costs to the US about half of the total expenses of the LHC (and the LHC is built by many countries). And I talked to theorists fifteen years ago who were hopeful the signs will be there. A year ago too, different ones and different signs. arxiv.org/pdf/1407.8120.pdf look at page 59 fig 7
20h
revised What is antimatter and its role in the universe?
commas
20h
answered What is antimatter and its role in the universe?
22h
revised With the LHC about to restart as max energy, are there absolutely no hints or tantalizing signs of Supersymmetry in previous data?
correction
23h
answered With the LHC about to restart as max energy, are there absolutely no hints or tantalizing signs of Supersymmetry in previous data?
1d
comment single photon/electron double slit experiment, resetting the detector material after each impact
link of first video was missing, corrected it.Yes, the second one is a demonstration not an experiment. to first is an experiment. sorry for the mixup
1d
revised single photon/electron double slit experiment, resetting the detector material after each impact
added 56 characters in body
1d
answered single photon/electron double slit experiment, resetting the detector material after each impact
1d
comment Black Body Golf Balls
link for Stefan Boltzmann law hyperphysics.phy-astr.gsu.edu/hbase/thermo/stefan.html
2d
comment Have two identical quantum mechanical experiments ever been done?
@Joseph your last comment makes no sense. At the atomic level one is in the Heisenberg Uncertainty Principle range and no such controls can even be imagined.
2d
answered Does quantum mechanics imply that particles have no trajectories?
2d
comment Why does the magnitude squared of the wave function give us the probability density?
@JánLalinský Of course it makes sense. Physics is not mathematics. It uses mathematics with extra postulates with the strength of axioms, which connect/interpret the mathematical formulae to physically measurable quantities. One of these physics axioms/postulates is the interpretation of the quantities as probabilities for measuring observables. Without a version of the Born rule quantum mechanics does not make sense, does not connect with the data. hyperphysics.phy-astr.gsu.edu/hbase/quantum/qm.html