1,809 research outputs found
Radion effective theory in the detuned Randall-Sundrum model
We compute the two-derivative low-energy effective action for the radion in
the (supersymmetric) Randall-Sundrum scenario with detuned brane tensions. At
the classical level, a potential automatically stabilizes the distance between
the branes. In the supersymmetric case, supersymmetry can be broken
spontaneously by a vacuum expectation value for the fifth component of the
graviphoton.Comment: 17 pages. JHEP class. New Appendix. Published versio
Mass Deformation of the Multiple M2 Branes Theory
Based on recent developments, in this letter we study the one parameter
deformation of 2+1 dimensional gauge theories with scale invariance and N = 8
supersymmetry, which is expected to be the field theory living on a stack of M2
branes. The deformed gauge theory is defined by a Lagrangian and is based on an
infinite set of novel 3-algebras constructed by relaxing the assumption that
the invariant metric is positive definite. Under the Higgs mechanism, we can
obtain the D-branes world volume theory in the presence of background fluxes.Comment: 13pages, no figures, reference adde
Relating U(N)xU(N) to SU(N)xSU(N) Chern-Simons Membrane theories
By integrating out the U(1)_B gauge field, we show that the U(n)xU(n) ABJM
theory at level k is equivalent to a Z_k identification of the
(SU(n)xSU(n))/Z_n Chern-Simons theory, but only when n and k are coprime. As a
consequence, the k=1 ABJM model for two M2-branes in R^8 can be identified with
the N=8 (SU(2)xSU(2))/Z_2 theory. We also conjecture that the U(2)xU(2) ABJM
model at k=2 is equivalent to the N=8 SU(2)xSU(2)-theory.Comment: 16 pages, Latex; v2: references added; v3: Clarifications adde
Matter couplings in partially broken extended supersymmetry
We use nonlinear realizations to describe the spontaneous breaking of
supersymmetry to in four dimensions. We identify the Goldstone multiplet
with an chiral superfield, and show that chiral matter is
consistent with the partially broken supersymmetry. We find that the
chiral matter can be in any representation of the gauge group; no mirror
particles are required. We present the Goldstone action and the general
couplings to matter to the first nontrivial order in the scale of
symmetry breaking.Comment: JHU-TIPAC-94011, 9 pages. References adde
Comments on Multiple M2-branes
Recently a three-dimensional field theory was derived that is consistent with
all the symmetries expected of the worldvolume action for multiple M2-branes.
In this note we examine several physical predictions of this model and show
that they are in agreement with expected M2-brane dynamics. In particular, we
discuss the quantization of the Chern-Simons coefficient, the vacuum moduli
space, a massive deformation leading to fuzzy three-sphere vacua, and a
possible large n limit. In this large n limit, the fuzzy funnel solution
correctly reproduces the mass of an M5-brane.Comment: 18 pages. Published versio
Unifying N=5 and N=6
We write the Lagrangian of the general N=5 three-dimensional superconformal
Chern-Simons theory, based on a basic Lie superalgebra, in terms of our
recently introduced N=5 three-algebras. These include N=6 and N=8
three-algebras as special cases. When we impose an antisymmetry condition on
the triple product, the supersymmetry automatically enhances, and the N=5
Lagrangian reduces to that of the well known N=6 theory, including the ABJM and
ABJ models.Comment: 19 pages. v2: Published version. Minor typos corrected, references
adde
Three-Algebras in N = 5, 6 Superconformal Chern-Simons Theories: Representations and Relations
In this work we present 3-algebraic constructions and representations for
three-dimensional N = 5 supersymmetric Chern-Simons theories, and show how they
relate to theories with additional supersymmetries. The N = 5 structure
constants give theories with Sp(2N) \times SO(M) gauge symmetry, as well as
more exotic symmetries known from gauged supergravity. We find explicit lifts
from N = 6 to 8, and N = 5 to 6 and 8, for appropriate gauge groups.Comment: 23 pages. Published version. References correcte
Three-dimensional topologically gauged N=6 ABJM type theories
In this paper we construct the conformal supergravity in three
dimensions from a set of Chern-Simons-like terms one for each of the graviton,
gravitino, and R-symmetry gauge field and then couple this theory to the
superconformal ABJM theory. In a first step part of the coupled
Lagrangian for this topologically gauged ABJM theory is derived by demanding
that all terms of third and second order in covariant derivatives cancel in the
supersymmtry variation of the Lagrangian. To achieve this the transformation
rules of the two separate sectors must be augmented by new terms. In a second
step we analyze all terms in that are of first order in covariant
derivatives. The cancelation of these terms require additional terms in the
transformation rules as well as a number of new terms in the Lagrangian. As a
final step we check that all remaining terms in which are bilinear
in fermions cancel which means that the presented Lagrangian and transformation
rules constitute the complete answer. In particular we find in the last step
new terms in the scalar potential containing either one or no structure
constant. The non-derivative higher fermion terms in that have not
yet been completely analyzed are briefly discussed.Comment: 26 pages, v.2 minor corrections, comment on relation to chiral
gravity added
- …