6,540 research outputs found
M, Membranes, and OM
We examine the extent to which the action for the membrane of M-theory (the
eleven-dimensional construct which underlies and unifies all of the known
string theories) simplifies in the so-called Open Membrane (OM) limit, a limit
which lies at the root of the various manifestations of noncommutativity in the
string context. In order for the discussion to be relatively self-contained, we
start out by reviewing why the strings of ten-dimensional string theory are in
fact membranes (M2-branes) living in eleven dimensions. After that, we recall
the definition of OM theory, as well as the arguments showing that it is part
of a larger, eleven-dimensional structure known as Galilean or Wrapped M2-brane
(WM2) theory. WM2 theory is a rich theoretical construct which is interesting
for several reasons, in particular because it is essentially a toy model of
M-theory. We then proceed to deduce a membrane action for OM/WM2 theory, and
spell out its implications for the four different types of M2-branes one can
consider in this setting. For two of these types, the action in question can be
simplified by gauge-fixing to a form which implies a discrete membrane
spectrum. The boundary conditions for the remaining two cases do not allow this
same gauge choice, and so their dynamics remain to be unraveled.Comment: LaTeX 2e, 8 pages; aimed at phenomenologists. Invited talk given by
A. Guijosa at the X Mexican School of Particles and Fields, Playa del Carmen,
Mexico, November 200
Radiation Damping in a Non-Abelian Strongly-Coupled Gauge Theory
We study a `dressed' or `composite' quark in strongly-coupled N=4
super-Yang-Mills (SYM), making use of the AdS/CFT correspondence. We show that
the standard string dynamics nicely captures the physics of the quark and its
surrounding quantum non-Abelian field configuration, making it possible to
derive a relativistic equation of motion that incorporates the effects of
radiation damping. From this equation one can deduce a non-standard dispersion
relation for the composite quark, as well as a Lorentz covariant formula for
its rate of radiation.Comment: 10 pages; based on talks at Quantum Theory and Symmetries 6 and the
XII Mexican Workshop of Particles and Fields
Jazz Orchestra I
Disc Two of TwoJazz Orchestra IAntonio J. Garcia, directorwith guest soloistMatt Wilson, drumsTuesday, April 9, 2019 at 8pmSonia Vlahcevic Concert Hall / W.E. Singleton Center for the Performing Arts922 Park Avenue / Richmond, Va
Fall Jazz Festival, Jazz Orchestra I
Fall Jazz Festival
Jazz Orchestra II, Marcus Tenney, director
Jazz Orchestra I, Antonio J. Garcia, director
Jazz Facult
- …