Covariant loop gravity comes out of the canonical analysis Palatini action and use Dirac brackets arising from dealing with second class constraints (``simplicity'' constraints). Within this framework, we underline a quantization ambiguity due to existence family possible Lorentz connections. We show connection generalizing Ashtekar-Barbero quantize theory showing that it leads usual $\mathrm{SU}(2)$ quantum area spectrum given by Casimir operator. This covariant point view allows us analyze...

This review is devoted to the analysis of mutual consistency spin foam and canonical loop quantizations in three four spacetime dimensions. In three-dimensional context, where two approaches are good agreement, we show how quantization \`a la Witten Riemannian gravity with a positive cosmological constant related Turaev-Viro model, Ponzano-Regge amplitudes physical scalar product quantum without constant. four-dimensional case, recall Lorentz-covariant formulation using projected networks,...

Alzheimer disease (AD) is a of lost memories. Mushroom postsynaptic spines play key role in memory storage, and loss mushroom has been proposed to be linked AD. Generation amyloidogenic peptides accumulation amyloid plaques one the pathological hallmarks It important evaluate effects on stability spines.In this study we used vitro vivo models synaptotoxicity investigate hippocampal spines. We discovered that application Aβ42 oligomers cultures or injection directly into region resulted...

This work is devoted to the development of nanosphere lithography (NSL) technology, which a low-cost and efficient method form nanostructures for nanoelectronics, as well optoelectronic, plasmonic photovoltaic applications. Creating mask by spin-coating promising, but not sufficiently studied method, requiring large experimental base different sizes nanospheres. So, in this work, we investigated influence technological parameters NSL on substrate coverage area monolayer nanospheres with...

Abstract This review gives an overview of the characteristics various non‐thermal, non‐equilibrium plasmas and discusses applications AP‐PECVD with dielectric barrier discharges, corona RF microwave discharges.

An so(4,C)-covariant hamiltonian formulation of a family generalized Hilbert-Palatini actions depending on parameter (the so called Immirzi parameter) is developed. It encompasses the Ashtekar-Barbero gravity which serves as basis quantum loop gravity. Dirac quantization this system constructed. Next we study dependence parameter. The path integral shows no it. A way to modify approach in accordance with formalism developed here briefly outlined.

Abstract In this paper we report on a study of an AP‐PECVD process based simple, and very inexpensive, dielectric barrier discharge using standard mains supply frequency. We have investigated the effect range deposition parameters properties silicon oxide layers grown from HMDSO/O 2 /Ar system. It is shown that flux energetic species generation critical parameter in determining growth rate characteristics deposited films. Growth rates up to 10 nm min –1 can be achieved layer properties, such...

We present some results on instanton corrections to the hypermultiplet moduli space in Calabi–Yau compactifications of type-II string theories. Previously, using twistor methods, only a class D-instantons (D2-instantons wrapping A-cycles) was incorporated exactly and rest treated linearly. go beyond linear approximation give set holomorphic functions which, through known procedure, capture effect at all orders. Moreover, we show that for sector where charges have vanishing symplectic...

We investigate quantum corrections to the hypermultiplet moduli space $ \mathcal{M} in Calabi-Yau compactifications of type II string theories, with particular emphasis on instanton effects from Euclidean NS5-branes. Based consistency D- and NS5-instanton corrections, we determine topology at fixed coupling, as previewed [1]. On IIB side, compute (p, k)-fivebrane instantons metric (specifically, correction complex contact structure its twistor \mathcal{Z} ) by applying S-duality D-instanton...

Abstract In this work, we demonstrate an effective way of deep (30 µm depth), highly oriented (90° sidewall angle) structures formation with sub-nanometer surface roughness ( R ms = 0.7 nm) in silicon carbide (SiC). These were obtained by dry etching SF 6 /O 2 inductively coupled plasma (ICP) at increased substrate holder temperatures. It was shown that change the temperature range from 100 to 300 °C leads a sharp decrease root mean square 153 nm. Along this, it has been established rate SiC...

A bstract Type IIA string theory compactified on a Calabi-Yau threefold has hypermultiplet moduli space whose metric is known to receive non-perturbative corrections from Euclidean D2-branes wrapped 3-cycles. These have been computed earlier by making use of mirror symmetry, S-duality and twistorial description quaternionic geometries. In this paper we compute the leading in each homology class using direct world-sheet approach without relying any duality symmetry or supersymmetry. Our...

We clarify the role played by Immirzi parameter in classical gravity coupled to fermions. Considering general non-minimal coupling, we show that, although torsion depends explicitly on parameter, a suitable parametrization effective action obtained integrating out spin connection is independent of it. Thus, not detectable theory even after coupling

We suggest a modification of the Barrett-Crane spin foam model four-dimensional Lorentzian general relativity motivated by canonical quantization. The starting point is Lorentz covariant loop quantum gravity. Its kinematical Hilbert space found as so-called projected networks. These networks are identified with boundary states and provide generalization unique intertwiner. propose way to modify quantization procedure arrive at this generalization: $B$ field (bivectors) should be promoted not...

We present two results on the recently proposed new spin foam models. First, we show how a (slightly modified) restriction representations in EPRL model leads to appearance of Ashtekar-Barbero connection, thus bringing this even closer LQG. Second, however argue that quantization procedure used derive models is inconsistent since it relies symplectic structure unconstraint BF theory.

We use the manifestly Lorentz covariant canonical formalism to evaluate eigenvalues of area operator acting on Wilson lines. To this end we modify standard definition loop states make it applicable present case noncommutative connections. The is diagonalized by using usual shift ambiguity in connection. are then expressed through quadratic Casimir operators. No dependence Immirzi parameter appears.

We consider the non-chiral, full Lorentz group-based Plebanski formulation of general relativity in its version that utilizes Lagrange multiplier field Φ with 'internal' indices. The Hamiltonian analysis this theory turns out to be simpler than previously considered literature carrying spacetime then extend a more class theories whose action contains scalar invariants constructed from Φ. Such have recently been context unification gravity other forces. show these six additional propagating...

Inspired by the split attractor flow conjecture for multi-centered black hole solutions in $N = 2$ supergravity, we propose a formula expressing BPS index $\Omega (\gamma , z)$ terms of ‘attractor indices’ $\Omega_{\ast} (\gamma_i)$. The latter count states their respective chamber. This expresses as sum over stable trees weighted products indices. We show how to compute contribution each tree directly asymptotic data, without having integrate explicitly. Furthermore, derive new...

We study general linear perturbations of a class 4d real-dimensional hyperkahler manifolds obtainable by the (generalized) Legendre transform method. Using twistor methods, we show that deformations can be encoded in set holomorphic functions 2d+1 variables, as opposed to d+1 variables controlling unperturbed metric. Such generically break all tri-holomorphic isometries Geometrically, these generate symplectomorphisms which relate local complex Darboux coordinate systems different patches...