831 research outputs found
Linear Quivers and N=1 SCFTs from M5-branes
We study a class of N=1 quiver gauge theories build out of vector multiplets
and matter multiplets in the fundamental and bifundamental representations. We
argue that these theories flow to interacting SCFTs in the IR and calculate
their central charges. We exhibit a type IIA brane construction which at low
energies is described by these SCFTs. This also leads to a natural description
of the theories in terms of M5-branes on a punctured sphere.Comment: 21 pages, 5 figure
Universal RG Flows Across Dimensions and Holography
We study RG flows between superconformal field theories living in different
spacetime dimensions which exhibit universal properties, independent of the
details of the UV and IR theories. In particular, when the UV and IR theories
are both even-dimensional we establish exact universal relations between their
conformal anomaly coefficients. We also provide strong evidence for similar
relations between appropriately defined free energies for RG flows between
odd-dimensional theories in the large limit. Holographically, these RG
flows across dimensions are described by asymptotically AdS black branes in a
gauged supergravity theory, which we exhibit explicitly. We also discuss the
uplift of these solutions to string and M-theory and comment on how the entropy
of such black branes is captured by the dual field theory.Comment: 64 pages, 2 figures; v2: additional comments and references, typos
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Comments on Squashed-sphere Partition Functions
We study the partition function of odd-dimensional conformal field theories
placed on spheres with a squashed metric. We establish that the round sphere
provides a local extremum for the free energy which, in general, is not a
global extremum. In addition, we show that the leading quadratic correction to
the free energy around this extremum is proportional to the coefficient, ,
determining the two-point function of the energy-momentum tensor in the CFT.
For three-dimensional CFTs, we compute explicitly this proportionality constant
for a class of squashing deformations which preserve an
isometry group on the sphere. In addition, we evaluate the free energy as a
function of the squashing parameter for theories of free bosons, free fermions,
as well as CFTs holographically dual to Einstein gravity with a negative
cosmological constant. We observe that, after suitable normalization, the
dependence of the free energy on the squashing parameter for all these theories
is nearly universal for a large region of parameter space and is well
approximated by a simple quadratic function arising from holography. We
generalize our results to five-dimensional CFTs and, in this context, we also
study theories holographically dual to six-dimensional Gauss-Bonnet gravity.Comment: 40 pages, 7 figures, 1 table; v2: additional comments and
clarifications added, updated bibliograph
(0,2) SCFTs from the Leigh-Strassler Fixed Point
We show that there is a family of two-dimensional SCFTs associated
with twisted compactifications of the four-dimensional
Leigh-Strassler fixed point on a closed hyperbolic Riemann surface. We
calculate the central charges for this class of theories using anomalies and
-extremization. In a suitable truncation of the five-dimensional maximal
supergravity, we construct supersymmetric solutions that are
holographic duals of those two-dimensional SCFTs. We also exhibit
supersymmetric domain wall solutions that are holographically dual to the RG
flows between the four-dimensional and two-dimensional theories.Comment: 40 pages, 6 figure
Mass-deformed ABJM and Black Holes in AdS
We find a class of new supersymmetric dyonic black holes in four-dimensional
maximal gauged supergravity which are asymptotic to the invariant AdS Warner vacuum. These black holes can be embedded in
eleven-dimensional supergravity where they describe the backreaction of
M2-branes wrapped on a Riemann surface. The holographic dual description of
these supergravity backgrounds is given by a partial topological twist on a
Riemann surface of a three-dimensional SCFT that is obtained by
a mass-deformation of the ABJM theory. We compute explicitly the topologically
twisted index of this SCFT and show that it accounts for the entropy of the
black holes.Comment: 67 pages, 7 figure
Spherical Branes
We construct new solutions of ten-dimensional supergravity with sixteen
supercharges which describe the backreaction of D-branes with spherical
worldvolume. These solutions are holographically dual to the
-dimensional maximally supersymmetric Yang-Mills theory on .
The finite size of the sphere provides an IR cut-off for the gauge theory which
is manifested in the supergravity solution as a smooth cap-off of the geometry.
In the UV the size of the sphere plays no role and the backgrounds asymptote to
the well-known supergravity solutions that describe the near-horizon limit of
flat D-branes. We compute the on-shell action of our spherical brane
solutions and show that it is in agreement with recent supersymmetric
localization results for the free energy of maximal SYM theory on .Comment: 57 pages, 4 figures; v2: minor corrections, appendix adde
Supersymmetric Janus Solutions in Four Dimensions
We use maximal gauged supergravity in four dimensions to construct the
gravity dual of a class of supersymmetric conformal interfaces in the theory on
the world-volume of multiple M2-branes. We study three classes of examples in
which the -dimensional defects preserve , or
supersymmetry. Many of the solutions have the maximally supersymmetric
vacuum dual to the ABJM theory on both sides of the interface.
We also find new special classes of solutions including one that interpolates
between the maximally supersymmetric vacuum and a conformal fixed point with
supersymmetry and global symmetry. We find another
solution that interpolates between two distinct conformal fixed points with
supersymmetry and global symmetry. In eleven dimensions,
this to solution corresponds to a domain wall across which a
magnetic flux reverses orientation.Comment: 54 pages, 11 figure
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