Holographic Tools Research Articles

Estimate for the Bulk Viscosity of Strongly Coupled Quark Matter Using Perturbative QCD and Holography.

Modern hydrodynamic simulations of core-collapse supernovae and neutron-star mergers require knowledge not only of the equilibrium properties of strongly interacting matter, but also of the system's response to perturbations, encoded in various transport coefficients. Using perturbative and holographic tools, we derive here an improved weak-coupling and a new strong-coupling result for the most important transport coefficient of unpaired quark matter, its bulk viscosity. These results are combined in a simple analytic pocket formula for the quantity that is rooted in perturbative quantum chromodynamics at high densities but takes into account nonperturbative holographic input at neutron-star densities, where the system is strongly coupled. This expression can be used in the modeling of unpaired quark matter at astrophysically relevant temperatures and densities.

Intelligent Avatars, Holographic Tools, Digitized Objects: An Extended Reality Simulation Demonstration

How can we design engaging and effective medical education both online and on site? Extended reality (XR) is a term referring to all real-and-virtual combined environments and human-machine interactions generated by computer technology and wearables. It includes representative forms such as AR, VR, and MR, and the areas interpolated among them. MR is a domain of particular interest today: It takes place not only in the physical world or in the virtual world, but is a mix of the real and the virtual. Metaverses can be enabled by MR wearable augments. Glasses-free MR is another very interesting dimension: e-REALâ, as a MR environment for hybrid simulation and medical education in general, can be a stand-alone solution or even networked between multiple places through a link to a special videoconferencing system. Digital humans and human-sized holograms are part of the e-REAL scenarios, making this solution unique, rich, and diversified.

Using a holographic application in learning medical terminology for English as a foreign language students

ABSTRACT The mastery of vocabulary is a fundamental step when learning a language but for many learners, it seems difficult and boring. English as Foreign Language (EFL) learners find some difficulties in learning new words. The aim of this study was to examine the effect of using the hologram application in learning medical English terminology for EFL learners. The study involved 109 EFL learners studying at a medical college to determine if a holographic tool affected their learning. They were divided into three groups: a control group using traditional methods to learn new medical terms (no technology was used), and two experimental groups. One experimental group was taught using PowerPoint without the holographic application, while the other experimental group was taught using the holographic application. The data were collected using the pre-, post-, and delayed post-test design. The findings of the study indicated that learners who were taught using the holographic application outscored other groups and remembered more medical English terms after three weeks. Moreover, the learners felt the hologram application had a positive impact on learning medical terms.

Study on the tool setting method of micro-milling tool based on in-line holography

Aiming at the various shortcomings of existing tool setting methods, this paper proposes a coaxial holographic tool setting method for tiny tools. Based on the research and analysis of the principle of holographic imaging and the key issues of holographic images, a set of holographic tool setting detection device for micro milling tool was built, and the micro milling tool measurement was carried out on the five-axis machining center using standard tools. experiment. Experimental results show that the tool setting device can efficiently perform tool setting detection of micro-milling tool. Compared with the measurement results of the high-precision external presetting instrument, the relative error of the contact tool setting instrument is 0.033%, and the relative error of the holographic tool setting prototype is 0.007%, which is more effective in realizing the tool setting of tiny tools. Detection. This result verifies the feasibility of the coaxial holographic tool setting method for micro tool, that is, holographic measurement can be used for high-precision tool setting of micro milling tool.

Revealing rescattering-induced subcycle dynamics of the spiral-like holographic structure

Employing a semiclassical quantum-trajectory Monte Carlo model, we comprehensively study the formerly overlooked strong-field photoelectron holographic pattern, ``the spiral,'' originating from the interference of the forward and backward rescattering trajectories. We include the multipass rescattering trajectories, which were left out before, and find that only the ones revisiting the parent ion for the same even number of times (including zero) before the recollision from adjacent half cycles can lead to the spiral. By using a rescattering sphere to differentiate trajectories, we revealed that after the recollision only the backward rescattering trajectories with the turning point outside the sphere can interfere with the forward ones and result in the spiral eventually. The relationship between the fringe width of the spiral and the ionization time is identified. This study gives a deeper understanding of how to use the spiral as a holographic tool.

FR Gravity Effects on Charged Accelerating AdS Black Holes Using Holographic Tools

We investigate numerically fR gravity effects on certain AdS/CFT tools including holographic entanglement entropy and two-point correlation functions for a charged single accelerated Anti-de Sitter black hole in four dimensions. We find that both holographic entanglement entropy and two-point correlation functions decrease by increasing the acceleration parameter A, matching perfectly with literature. Taking into account the fR gravity parameter η, the decreasing scheme of the holographic quantities persist. However, we observe a transition-like point where the behavior of the holographic tools changes. Two regions meeting at such a transit-like point are shown up. In such a nomination, the first one is associated with slow accelerating black holes while the second one corresponds to a fast accelerating solution. In the first region, the holographic entanglement entropy and two-point correlation functions decrease by increasing the η parameter. However, the behavioral situation is reversed in the second one. Moreover, a cross-comparison between the entropy and the holographic entanglement entropy is presented, providing another counterexample showing that such two quantities do not exhibit similar behaviors.

Complexity and emergence of warped AdS3 space-time from chiral Liouville action

In this work we explore the complexity path integral optimization process for the case of warped AdS3/warped CFT2 correspondence. We first present the specific renor- malization flow equations and analyze the differences with the case of CFT. We discuss how the “chiral Liouville action” could replace the Liouville action as the suitable cost function for this case. Starting from the other side of the story, we also show how the deformed Liouville actions could be derived from the spacelike, timelike and null warped metrics and how the behaviors of boundary topological terms creating these metrics, versus the deformation parameter are consistent with our expectations. As the main results of this work, we develop many holographic tools for the case of warped AdS3, which include the tensor network structure for the chiral warped CFTs, entangler function, surface/state correspondence, quantum circuits of Kac-Moody algebra and kinematic space of WAdS/WCFTs. In addition, we discuss how and why the path-integral complexity should be generalized and propose several other examples such as Polyakov, p-adic strings and Zabrodin actions as the more suitable cost functions to calculate the circuit complexity.

Are there Goldstone bosons in d≤z+1 ?

We study the viability of spontaneous breaking of continuous symmetries in theories with Lifshitz scaling, according to the number of space-time dimensions $d$ and the dynamical scaling $z$. Then, the answer to the question in the title is no (quantum field theoretically) and yes (holographically). With field theory tools, we show that symmetry breaking is indeed prevented by large quantum fluctuations when $d\leq z+1$, as expected from scaling arguments. With holographic tools, on the other hand, we find nothing that prevents the existence of a vacuum expectation value. This difference is made possible by the large $N$ limit of holography. An important subtlety in this last framework is that in order to get a proper description of a conserved current, renormalization of the temporal mode of the bulk vector requires an alternative quantization. We also comment on the implications of turning on temperature.

Holo-BLSD – A Holographic Tool for Self-training and Self-Evaluation of Emergency Response Skills

In case of cardiac arrest, prompt intervention of bystanders can be vital in saving lives. Basic Life Support and Defibrillation (BLSD) is a procedure designed to deliver a proficient emergency first response. Developing skills in BLSD in a large part of the population is a primary educational goal of resuscitation medicine. In this context, novel computer science technologies like Augmented Reality (AR) and Virtual Reality (VR) can alleviate some of the drawbacks of traditional instructor-led courses, especially concerning time and cost constraints. This paper presents Holo-BLSD, an AR system that allows users to learn and train the different operations involved in BLSD and receive an automatic assessment. The system uses a standard manikin which is “augmented” by an interactive virtual environment that reproduces realistic emergency scenarios. The proposed approach has been validated through a user study. Subjective results confirmed the usability of the devised tool and its capability to stimulate learners’ attention. Objective results indicated no statistical significance in the differences between the examiners’ evaluation of users who underwent traditional and AR training; they also showed a close agreement between expert and automatic assessments, suggesting that Holo-BLSD can be regarded as an effective self-learning method and a reliable self-evaluation tool.

Theta Dependence in Yang-Mills from Holography

In this contribution we review how holographic tools can be used to study the dependence on the CP-breaking θ parameter of various observables in a large Nc Yang-Mills model. Relevant examples are the ground-state energy density, the string tension, the glueball mass spectrum and the critical temperature for deconfinement. These observables have been also studied, in the small θ regime and up to very few powers of θ 2 , in pure Yang-Mills on the Lattice. The holographic results qualitatively agree with available Lattice data and, being exact in θ , provide benchmarks for higher order corrections.

All-Digital Holographic Tool for Mode Excitation and Analysis in Optical Fibers

A procedure for the multiplexing and demultiplexing of modes in optical fibers with digital holograms is presented. By using a spatial light modulator (SLM) to encode a digital hologram, the desired complex field is shaped and injected into the fiber. The SLM's ability to rapidly refresh the encoded transmission function enables one to excite pure single modes, as well as arbitrary coherent mode superpositions, in real-time. The modes from the output of the fiber are subsequently demultipexed by applying a correlation filter for modal decomposition, thus allowing for an all-digital-hologram approach to modal analysis of fibers. The working principle is tested using conventional step-index large mode area fibers being excited with higher-order single modes and superpositions.

In‐situ holographic elastic moduli measurements from boreholes

We have developed a unique technique employing optical holography to measure the static Young’s modulus (E) from a borehole. In the experiment, a known point force induces micron scale displacements on the borehole wall which are recorded by a double‐exposure hologram. Raw data consist of dark fringes superimposed on the three‐dimensional image whose pattern is modeled to find E directly. In the laboratory, the holographic technique determined E on rock and metal samples to an uncertainty better than 10 percent. For example, double exposure holograms of a saw‐cut sample of dolomitic marlstone gave an E of 16.8 ± 2.8 GPa in agreement with 17.2 ± 2.0 GPa predicted by published density‐modulus relationships. Field tests of a holographic tool in a horizontal mine pillar borehole gave in‐situ Es which range from 26.9 to 36.0 GPa. Although these data could be interpreted as localized elastic heterogeneity within the rock mass, elastic anisotropy of the rock is a possible explanation for this variation.