Linearized supergravity with a dynamical preferred frame

We study supersymmetric extension of the Einstein-aether gravitational model where local Lorentz invariance is broken down to the subgroup of spatial rotations by a vacuum expectation value of a timelike vector field called aether. Embedding aether into a chiral vector superfield, we construct the most general action which describes dynamics of linear perturbations around the Lorentz-violating vacuum and is invariant under the linearized supergravity transformations. The analysis is performed both in the off-shell non-minimal superfield formulation of supergravity and in the “on-shell” approach invoking only physical component fields. The resulting model contains a single free coupling, in addition to the standard supergravity parameters. The spectrum of physical excitations features an enhanced on-shell gravity multiplet comprising four states with helicities 2, 3/2, 3/2 and 1 propagating with superluminal velocity. The remaining excitations propagate with the speed of light. We outline the observational constraints on the model following from its low-energy phenomenology.

On 1D, $$ \mathcal{N} $$ = 4 supersymmetric SYK-type models. Part I

Proposals are made to describe 1D, $$ \mathcal{N} $$ N = 4 supersymmetrical systems that ex- tend SYK models by compactifying from 4D, $$ \mathcal{N} $$ N = 1 supersymmetric Lagrangians involving chiral, vector, and tensor supermultiplets. Quartic fermionic vertices are generated via in- tegrals over the whole superspace, while 2(q − 1)-point fermionic vertices are generated via superpotentials. The coupling constants in the superfield Lagrangians are arbitrary, and can be chosen to be Gaussian random. In that case, these 1D, $$ \mathcal{N} $$ N = 4 supersymmetric SYK models would exhibit Wishart-Laguerre randomness, which share the same feature among other 1D supersymmetric SYK models in literature. One difference with 1D, $$ \mathcal{N} $$ N = 1 and $$ \mathcal{N} $$ N = 2 models though, is our models contain dynamical bosons, but this is consistent with other 1D, $$ \mathcal{N} $$ N = 4 and 2D, $$ \mathcal{N} $$ N = 2 models in literature. Added conjectures on duality and possible mirror symmetry realizations in these models is noted.

Molecular dynamics simulation of a nanofluidic energy absorption system: effects of the chiral vector of carbon nanotubes

A Nanofluidic Energy Absorption System (NEAS) is a novel nanofluidic system with a small volume and weight.

Effect of Device Parameters on Carbon Nanotube Field Effect Transistor in Nanometer Regime

In this paper, we have analyzed the effect of chiral vector, temperature, metal work function, channel length and High-K dielectric on threshold voltage of CNTFET devices. We have also compared the effect of oxide thickness on gate capacitance and justified the advantage a CNTFET provides over MOSFET in nanometer regime. Simulation on HSPICE tool shows that high threshold voltage can be achieved at low chiral vector pair in CNTFET. It is also observed that the temperature has a negligible effect on threshold voltage of CNTFET. After that we have simulated and observed the effect of channel length variation on threshold voltage of CNTFET as well as MOSFET devices and given a theoretical analysis on it. We found an unusual, yet, favorable characteristics that the threshold voltage increases with decreasing channel length in CNTFET devices in deep nanometer regime.

Adinkras and SUSY holography: Some explicit examples

We discuss the mechanism by which adinkras holographically store the required information for the Spin(1, 3) Clifford Algebra fiber bundle in the cases of three 4D, [Formula: see text] = 1 representations: the chiral, vector and tensor supermultiplets.

Recognition of Topology Feature of Graphene by Image Processing Technique

In order to extract characteristic values of graphene, a method based on a series of digital image processing algorithms was proposed in this paper. Using the method, we can automatically analyze topology structure and calculate amount of carbon atoms, and even calculate chiral vector indices (n, m) during in-situ TEM scanning of graphene. At last, we also write the correlative software with c++, which applying the digital image processing algorithms, and give out the processing result of several classic TEM image of graphene.