128 reputation
425
bio website dftuz.unizar.es/~rivero/…
location Zaragoza, Spain
age 47
visits member for 3 years, 11 months
seen 8 hours ago

Nov
19
awarded  Nice Answer
Oct
23
answered Is there some special case where a fermion can mediate a force?
Oct
22
accepted Is there some special case where a fermion can mediate a force?
Oct
22
comment Is there some special case where a fermion can mediate a force?
Hmm that looks as an exchange of a meson, does it?
Oct
19
comment Is there some special case where a fermion can mediate a force?
Yep, it seems that a Lorentz invariant single term in the lagrangian is not possible. And still I am a bit uneasy about a definite no.
Oct
19
asked Is there some special case where a fermion can mediate a force?
Oct
19
comment Why do electron and proton have the same but opposite electric charge?
absence of anomalies in the standard model. Sum of all the electric charges in one generation of quarks and leptons must be zero.
Oct
19
comment If protons and electrons had similar masses
More or less, they have... (105.6582+1776.82)/2= 941.24 MeV, and proton mass is 938.27 MeV. You could do some funny barycenters playing with muons and taus instead of electrons. (PS: note that the first average are yukawa-higgs masses, the second mass is QCD mass; completely unrelated. Funny coincidence)
Sep
30
comment What was Feynman's “much better way of presenting the electrodynamics” — which did **not** appear in the Feynman lectures?
@littleO my fault, I misread that you were quoting some preface to the lectures, not the interview. You are right, the "much better way" can not be DysonMaxwell.
Sep
28
comment What was Feynman's “much better way of presenting the electrodynamics” — which did **not** appear in the Feynman lectures?
@littleO 1961 happened after 1948.
Sep
24
comment How did Newton discover his second law?
Is a weak answer, and perhaps wrong, but I was suggesting that the process of proving such theorems led him to depth thinking about the laws and axioms need for it.
Sep
21
comment Handedness of Reference Frames?
:-DDD the title seems to ask if The Reference Frame is left-winded or right-winded. @Lubos Motl
Sep
21
comment Chiral anomalies
contraction or contradiction?
Sep
21
comment What happens to matter in a standard model with zero Higgs VEV?
arxiv.org/abs/arXiv:0901.3958 Gedanken Worlds without Higgs: QCD-Induced Electroweak Symmetry Breaking by Chris Quigg and Robert Shrock seems to be the precise answer to the question, is it?
Sep
21
comment What happens to matter in a standard model with zero Higgs VEV?
"posting an answer now requires 10 reputation on this site. " sure? I'd say it is more than 10.
Sep
20
awarded  Civic Duty
Sep
18
comment Is it possible to project an image as a vertical plane without the use of a screen?
@CuriousOne Thanks but not really my credit. There is some technique using controlled microexplosions, some trick of shooting plasm and firing it with a laser or something so. There is some video in youtube. At the end is not very different of the idea of the water but it allows both the laser and the fluid or gas to be launched from the vertical.
Sep
18
comment Is it possible to project an image as a vertical plane without the use of a screen?
Exploding microfireworks. Sounds expensive.
Sep
15
accepted How does the gluino change the strong force?
Sep
13
comment How does the gluino change the strong force?
It is well in the scope :-)