133 research outputs found
Janus solutions in six-dimensional gauged supergravity
Motivated by an analysis of the sub-superalgebras of the five-dimensional
superconformal algebra , we search for the holographic duals to
co-dimension one superconformal defects in 5d CFTs which have bosonic symmetry. In particular, we look for domain wall solutions to
six-dimensional gauged supergravity coupled to a single vector
multiplet. It is found that supersymmetric domain wall solutions do not exist
unless there is a non-trivial profile for one of the vector multiplet scalars
which is charged under the gauged R-symmetry. This non-trivial profile
breaks the to , thus matching expectations from the superalgebra
analysis. A consistent set of BPS equations is then obtained and solved
numerically. While the numerical solutions are generically singular and thought
to be dual to boundary CFTs, it is found that for certain fine-tuned choices of
parameters regular Janus solutions may be obtained.Comment: 35 pages, pdf-latex, 9 figures. v2: minor corrections, reference
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Mass deformations of 5d SCFTs via holography
Using six-dimensional Euclidean gauged supergravity we construct a
holographic renormalization group flow for a CFT on . Numerical solutions
to the BPS equations are obtained and the free energy of the theory on is
determined holographically by calculation of the renormalized on-shell
supergravity action. In the process, we deal with subtle issues such as
holographic renormalization and addition of finite counterterms. We then
propose a candidate field theory dual to these solutions. This tentative dual
is a supersymmetry-preserving deformation of the strongly-coupled
non-Lagrangian SCFT derived from the D4-D8 system in string theory. In the IR,
this theory is a mass deformation of a gauge theory. A localization
calculation of the free energy is performed for this IR theory, which for
reasonably small values of the deformation parameter is found to match with the
free energy calculated holographically.Comment: 43 pages, 8 figures, v2: references added, name of 2nd author
corrected, v3: typos corrected, improvement of section
Virtualization services: scalable methods for virtualizing multicore systems
Multi-core technology is bringing parallel processing capabilities
from servers to laptops and even handheld devices. At the same time,
platform support for system virtualization is making it easier to
consolidate server and client resources, when and as needed by
applications. This consolidation is achieved by dynamically mapping
the virtual machines on which applications run to underlying
physical machines and their processing cores. Low cost processor and
I/O virtualization methods efficiently scaled to different numbers of
processing cores and I/O devices are key enablers of such consolidation.
This dissertation develops and evaluates new methods for scaling
virtualization functionality to multi-core and future many-core systems.
Specifically, it re-architects virtualization functionality to improve
scalability and better exploit multi-core system resources. Results
from this work include a self-virtualized I/O abstraction, which
virtualizes I/O so as to flexibly use different platforms' processing
and I/O resources. Flexibility affords improved performance and resource
usage and most importantly, better scalability than that offered by
current I/O virtualization solutions. Further, by describing system virtualization as a
service provided to virtual machines and the underlying computing platform,
this service can be enhanced to provide new and innovative functionality.
For example, a virtual device may provide obfuscated data to guest operating
systems to maintain data privacy; it could mask differences in device
APIs or properties to deal with heterogeneous underlying resources; or it
could control access to data based on the ``trust' properties of the
guest VM.
This thesis demonstrates that extended virtualization services are
superior to existing operating system or user-level implementations
of such functionality, for multiple reasons. First, this solution
technique makes more efficient use of key performance-limiting resource in
multi-core systems, which are memory and I/O bandwidth. Second, this
solution technique better exploits the parallelism inherent in multi-core
architectures and exhibits good scalability properties, in
part because at the hypervisor level, there is greater control in precisely
which and how resources are used to realize extended virtualization services.
Improved control over resource usage makes it possible to provide
value-added functionalities for both guest VMs and the platform.
Specific instances of virtualization services described in this thesis are the
network virtualization service that exploits heterogeneous processing cores,
a storage virtualization service that provides location transparent access
to block devices by extending
the functionality provided by network virtualization service, a multimedia
virtualization service that allows efficient media device sharing based on semantic
information, and an object-based storage service with enhanced access
control.Ph.D.Committee Chair: Schwan, Karsten; Committee Member: Ahamad, Mustaq; Committee Member: Fujimoto, Richard; Committee Member: Gavrilovska, Ada; Committee Member: Owen, Henry; Committee Member: Xenidis, Jim
EVALUATION OF THE ADDED EFFECT OF AMRUTADI KASHAYA IN THE MANAGEMENT OF AMLAPITTA VIS A VIS ACID DYSPEPSIA
In Ayurvedic text Mandagni is the main cause of all the Roga including Amlapitta. by the increased Drava guna and Amla guna of Pachaka Pitta affecting the Annavaha, Rasavaha, Raktavaha, Purishvaha srotasa; Samana, Prana, Apana Vayu; mainly Kledaka and partially Bodhaka Kapha. Prana vayu, which having the Karma of Aadana, help the Anna to enter in the Kostha where the Anna gets disintegrated by fluids and softened by unctuous substances. Samana Vayu stimulates the Jatharagni which is situated in Amashaya and as a result proper digestion process starts. Agni performs normal functions when food is consumed in appropriate time and with appropriate and serves as promoter of longevity. Describing the Samprapti of Amlapitta Acharya Charaka says that Aamvisha, when get mixed with Pitta, the disease Amlapitta develops whereas Acharya Kashyapa described that the disease is caused by vitiation of Doshas (Tridosha) causing Mandagni which leads to Vyadhi Amlapitta.
Amlapitta can be correlated with Acid Reflux Syndrome which comprises of various types of Gastro-esophageal Reflux Diseases like Gastritis, Dyspepsia, Heartburn, Hyperacidity, Hypoacidity etc. Described in modern sciences.
The conventional science tries to find a cure for this through PPI, Antacid therapy, etc. which often results in ill effects. Here comes the importance of herbal remedies of Ayurveda. Amrutadi kashaya show a wide range of therapeutic usages. Because of its properties like Ushanta, Tikshanta, Katu, Tikta rasa, Ushnaa veerya help in Samprapti vighatana of Amlapitta. when Amrutadi kashaya is used with Laghusutashekhara rasa then, its result increases many fold in Amlapitta.
In this study 40 patients of Amlapitta were registered and 03 patient (6.66%) were got no improvement, 18 patients got mild -improvement, 19 patient were got moderate improvement, 0 patient got Marked improvement and complete cure
Integrated Correlators in SYM via Spectral Theory
We perform a systematic study of integrated four-point functions of half-BPS
operators in four-dimensional super Yang-Mills theory with
gauge group . These observables, defined by a certain spacetime integral
of where
is a superconformal primary of charge , are known to be
computable by supersymmetric localization, yet are non-trivial functions of the
complexified gauge coupling . We find explicit and remarkably simple
results for several classes of these observables, exactly as a function of
and . Their physical and formal properties are greatly illuminated upon
employing the spectral decomposition: in this
S-duality-invariant eigenbasis, the integrated correlators are fixed simply by
polynomials in the spectral parameter. These polynomials are determined
recursively by linear algebraic equations relating different and , such
that all integrated correlators are ultimately fixed in terms of the integrated
stress tensor multiplets in the theory. Our computations include the
full matrix of integrated correlators at low values of , and a certain
infinite class involving operators of arbitrary . The latter satisfy an open
lattice chain equation for all , reminiscent of the Toda equation obeyed by
extremal correlators in superconformal theories. We compute
ensemble averages of these observables and analyze our solutions at large ,
confirming and predicting features of semiclassical AdS S
supergravity amplitudes.Comment: 42+24 page
M-theory on at 1-loop and beyond
We study graviton scattering on , which is dual to the
stress tensor multiplet four-point function in the maximally supersymmetric 3d
ABJM theory. We compute 1-loop corrections to this
holographic correlator coming from Witten diagrams with supergravity and
higher derivative vertices, up to contact term ambiguities, and find that
the flat space limit matches the corresponding terms in the 11d M-theory
S-matrix. We then use supersymmetric localization to show that all the 1-loop
contact terms vanish, as was previously observed for the theory dual to ABJM. Finally, we use
the recent localization results of Gaiotto and Abajian, as inspired by twisted
M-theory, to compute all the short OPE coefficients in correlators of the
stress tensor multiplet and the next lowest half-BPS operator, which we find
saturate the bootstrap bounds on these mixed correlators for all .Comment: 20 pages, 2 figures, sequel to arXiv:2107.1027
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