285 research outputs found
Non-linear uplift Ans\"atze for the internal metric and the four-form field-strength of maximal supergravity
The uplift of SO(8) gauged N=8 supergravity to 11-dimensional supergravity is
well studied in the literature. It is given by consistent relations between the
respective vector and scalar fields of both theories. For example, recent work
provided non-linear uplift Ans\"atze for the scalar degrees of freedom on the
internal manifold: the inverse metric and the three-form flux with mixed index
structure. However, one always found the metric of the compactified manifold by
inverting the inverse metric --- a task that was only possible in particular
cases, e.g. for the G, SO(3)SO(3) or SU(3)U(1)U(1)
invariant solutions of 11-dimensional supergravity.
In this paper, I present a direct non-linear uplift Ansatz for the internal
metric in terms of the four-dimensional scalars and the Killing forms on the
compactified background manifold. Based on this formula, I also find new uplift
Ans\"atze for the warp factor and the full three-form flux. Finally, I provide
a direct non-linear uplift Ansatz for the internal four-form field-strength in
terms of the metric, the flux as well as the four-dimensional scalars and
background Killing forms. This new formula does not require to calculate the
derivative of the flux.
My results may be generalized to other compactifications, e.g. the reduction
from type IIB supergravity to five dimensions.Comment: 18page
Vertex-Constraints in 3D Higher Spin Theories
We analyse the constraints imposed by gauge invariance on higher-order
interactions between massless bosonic fields in three-dimensional higher-spin
gravities. We show that vertices of quartic and higher order that are
independent of the cubic ones can only involve scalars and Maxwell fields. As a
consequence, the full non-linear interactions of massless higher-spin fields
are completely fixed by the cubic vertex.Comment: 5 page
Development of an integrated solar-fossil powered steam generation system for industrial applications
Das Poster gibt eine kurze Einführung in das Projekt SolSteam, in dem die Integration solaren Prozessdampfes in einen konventionellen Dampferzeuger untersucht wird
Constraints for Three-Dimensional Higher-Spin Interactions and Conformal Correlators
In the context of higher-spin holography, we compare the classification of
cubic interaction vertices for higher-spin gravity theories in three dimensions
to the possible three-point correlation functions of conserved higher-spin
currents in two-dimensional conformal field theories. In both cases, the
allowed structures are governed by triangle inequalities for the involved
spins. It is established that higher-order correlators satisfy similar polygon
inequalities and that the same inequalities are valid for higher-order
continuations of cubic vertices in the three-dimensional higher-spin gravity.Comment: 21 page
Restrictions for -Point Vertices in Higher-Spin Theories
We give a simple classification of the independent -point interaction
vertices for bosonic higher-spin gauge fields in -dimensional Minkowski
space-times. We first give a characterisation of such vertices for large
dimensions, , where one does not have to consider Schouten
identities due to over-antisymmetrisation of space-time indices. When the
dimension is lowered, such identities have to be considered, but their
appearance only leads to equivalences of large- vertices and does not lead
to new types of vertices. We consider the case of low dimensions, , in
detail, where the large number of Schouten identities leads to strong
restrictions on independent vertices. We also comment on the generalisation of
our results to the intermediate case . In all cases, the
independent vertices are expressed in terms of elementary manifestly
gauge-invariant quantities, suggesting that no deformations of the gauge
transformations are induced.Comment: 35 pages, 1 figure, minor changes in v2: clarification added on
two-dimensions, references added, to appear in JHE
Identification of Proteins Interacting with Cytoplasmic High-Mobility Group Box 1 during the Hepatocellular Response to Ischemia Reperfusion Injury
Ischemia/reperfusion injury (IRI) occurs inevitably in liver transplantations and frequently during major resections, and can lead to liver dysfunction as well as systemic disorders. High-mobility group box 1 (HMGB1) plays a pathogenic role in hepatic IRI. In the normal liver, HMGB1 is located in the nucleus of hepatocytes; after ischemia reperfusion, it translocates to the cytoplasm and it is further released to the extracellular space. Unlike the well-explored functions of nuclear and extracellular HMGB1, the role of cytoplasmic HMGB1 in hepatic IRI remains elusive. We hypothesized that cytoplasmic HMGB1 interacts with binding proteins involved in the hepatocellular response to IRI. In this study, binding proteins of cytoplasmic HMGB1 during hepatic IRI were identified. Liver tissues from rats with warm ischemia reperfusion (WI/R) injury and from normal rats were subjected to cytoplasmic protein extraction. Co-immunoprecipitation using these protein extracts was performed to enrich HMGB1-protein complexes. To separate and identify the immunoprecipitated proteins in eluates, 2-dimensional electrophoresis and subsequent mass spectrometry detection were performed. Two of the identified proteins were verified using Western blotting: betaine–homocysteine S-methyltransferase 1 (BHMT) and cystathionine γ-lyase (CTH). Therefore, our results revealed the binding of HMGB1 to BHMT and CTH in cytoplasm during hepatic WI/R. This finding may help to better understand the cellular response to IRI in the liver and to identify novel molecular targets for reducing ischemic injury
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