3,121 research outputs found
What is missing from Minkowski's "Raum und Zeit" lecture
This contribution tries to highlight the importance of Minkowski's ``Raum und
Zeit'' lecture in a ``negative'' way, where {\it negative} is taken in the
photographic sense of reversing lights and shades. Indeed, we focus on the
``shades'' of Minkowski's text, i.e. what is missing, or misunderstood. In
particular, we focus on two issues: (i) why are Poincar\'e's pioneering
contributions to four-dimensional geometry not quoted by Minkowski (while he
abundantly quoted them a few months before the Cologne lecture)?, and (ii) did
Minkowski fully grasp the physical (and existential) meaning of ``time'' within
spacetime? We think that this ``negative'' approach (and the contrast between
Poincar\'e's and Minkowski's attitudes towards physics) allows one to better
grasp the boldness of the {\it revolutionary} step taken by Minkowski in his
Cologne lecture.Comment: 18 pages, to appear in the special (Sept/Oct 2008) issue of Annalen
der Physik (Berlin) commemorating H. Minkowski's 1908 lecture in Cologn
On the Spontaneous Identity of Chiral and Super Symmetry Breaking in Pure Super Yang Mills Theories
We show that in supersymmetric pure Yang Mills theories with arbitrary simple
gauge group, the spontaneous breaking of chiral fermionic and bosonic charge by
the associated gaugino and gauge boson condensates implies the spontaneous
breaking of supersymmetry by the condensate of the underlying Lagrangian
density. The explicit breaking of the restricted fermionic charge through the
chiral anomaly is deferred to a secondary stage in the elimination of infrared
singularities or long range forces.Comment: 14 pages, uses amsmath, amssymb, shorter version, references added,
eq. (44) correcte
CP Violation in Heavy Neutrino Mediated
We consider the reaction mediated by possible
heavy neutrino exchange at future LINAC energies of . This
reaction is sensitive to CP phases of the neutrino mixing matrices, even at the
level of Born amplitudes. Certain integrated cross-sections are shown to have
the power to resolve the CP phases when the experimental configurations are
varied. Asymmetries sensitive to CP violation (involving initial QED phases)
for and reactions are constructed and their consequences
considered.Comment: 9 pages plain Latex and 4 figures available separately as uuencoded
figure
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