11 research outputs found
3D Supergravity from wrapped D3-branes
AdS_3 solutions dual to N = (0,2) SCFTs arise when D3-branes wrap Kahler
two-cycles in manifolds with SU(4) holonomy. Here we review known AdS_3
solutions and identify the corresponding three-dimensional gauged
supergravities, solutions of which uplift to type IIB supergravity. In
particular, we discuss gauged supergravities dual to twisted compactifications
on Riemann surfaces of both N=4 SYM and N =1 SCFTs with Sasaki-Einstein duals.
We check in each case that c-extremization gives the exact central charge and R
symmetry. For completeness, we also study AdS_3 solutions from intersecting
D3-branes, generalise recent KK reductions of Detournay & Guica and identify
the underlying gauged supergravities. Finally, we discuss examples of
null-warped AdS_3 solutions to three-dimensional gauged supergravity, all of
which embed in string theory.Comment: v1 48 pages; v2 two references added, to appear in JHE
Hints of 5d Fixed Point Theories from Non-Abelian T-duality
In this paper we investigate the properties of the putative 5d fixed point
theory that should be dual, through the holographic correspondence, to the new
supersymmetric AdS(6) solution constructed in Lozano et al. This solution is
the result of a non-Abelian T-duality transformation on the known
supersymmetric AdS(6) solution of massive Type IIA. The analysis of the charge
quantization conditions seems to put constraints on the global properties of
the background, which, combined with the information extracted from considering
probe branes, suggests a 2-node quiver candidate for the dual CFT.Comment: v2, typos corrected, comments added, to appear in JHE
Supersymmetric AdS_6 via T-duality
We present a new supersymmetric AdS_6 solution of type IIB supergravity with
SU(2) isometry. Through the AdS/CFT correspondence, this has potentially very
interesting implications for 5d fixed point theories. This solution is the
result of a non-Abelian T-duality on the known supersymmetric AdS_6 solution of
massive IIA. The SU(2) R-symmetry is untouched, leading to sixteen supercharges
and preserved supersymmetry.Comment: 4 pages, published versio
Inevitable manifestation of wiggles in the expansion of the late Universe
Using the fact that the comoving angular diameter distance to the last
scattering surface is strictly constrained almost model independently, we show
that, for any model agreeing with the standard CDM model on its
background dynamics at and size of the comoving sound horizon at last
scattering, the deviations of the Hubble radius from the one of the standard
CDM model must be a member of the set of admissible wavelets. The
family of models characterized by this framework also offers nontrivial
oscillatory behaviours in various functions that define the kinematics of the
Universe, even when the wavelets themselves are very simple. We also discuss
the consequences of attributing these kinematics to, first, dark energy, and
second, varying gravitational coupling strength. Utilizing some simplest
wavelets, we demonstrate the competence of this framework in describing the
baryon acoustic oscillation (BAO) data without any modifications to the
agreement with cosmic microwave background measurements. This framework also
provides a natural explanation for the bumps found in nonparametric
observational reconstructions of the Hubble parameter and dark energy density
as compensations of the dips suggested by some BAO data, and questions the
physical reality of their existence. We note that utilizing this framework on
top of the models that agree with both the cosmic microwave background and
local measurements but are held back by BAO data, one may resurrect these
models through the wiggly nature of wavelets that can naturally accommodate the
BAO data. Finally, we also suggest narrowing the plausible set of admissible
wavelets to further improve our framework by imposing conditions from expected
kinematics of a viable cosmological model or first principle fundamental
physics such as energy conditions.Comment: 16 pages, 4 figures; matches the version published in Physical Review
Consistent reductions from D=11 beyond Sasaki-Einstein
The most general class of warped AdS5 x M6 supersymmetric solutions in D=11
supergravity permit a consistent truncation to D=5 N=2 minimal gauged
supergravity. Here we extend this truncation, for a particular subclass of M6
manifolds, to D=5 N=4 gauged supergravity coupled to two vector multiplets. We
obtain the reduction ansatz by T-duality of a recently discussed type IIB
truncation on a generic Sasaki-Einstein five-fold, which becomes non-trivial in
D=11 and displays non-standard features due to the G-structure of the internal
M6. Using this truncation, we construct two new classes of warped and unwarped
non-supersymmetric AdS5 M-theory backgrounds. We also comment on possible
extensions of the reduction ansatz to the general class of M6 geometries.Comment: Seven double column pages; v2: Acknowledgement added, version to be
published in Phys. Lett.