The sound horizon scale at the baryon drag epochde Carvalho, E; Bernui, A; Avila, F
doi: 10.1088/1742-6596/2678/1/012003pmid: N/A
We study how to measure the sound horizon scale at the baryon drag epoch, rs, a parameter considered a cosmological standard ruler, from the 2-point correlation function analysis. This important parameter is originated in the baryon acoustic oscillations (BAO) phenomenon, which supports the large-scale structure scenario of the ΛCDM cosmological model, and provides valuable information of the dynamical evolution of the Universe. For this, one of the aims of current astronomical surveys is to know this parameter with high precision. Here we study how to correctly extract the BAO sound horizon scale in case where the signature is weak because there are few correlated pairs, sourced from the BAO phenomenon, probably due to non-linear evolution processes.
Peer Review Statementdoi: 10.1088/1742-6596/2678/1/011002pmid: N/A
Peer Review StatementAll papers published in this volume have been reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.• Type of peer review: Undefined• Conference submission management system: Morressier• Number of submissions received: 11• Number of submissions sent for review: 11• Number of submissions accepted: 11• Acceptance Rate (Submissions Accepted / Submissions Received × 100): 100• Average number of reviews per paper: 2• Total number of reviewers involved: 12• Contact person for queries:Name: Carmen Rosa Eyzaguirre GorveniaEmail: [email protected]: Universidad Nacional de Ingeniería
Correcting the gravitational dipole direction for a partial sky surveyAvila, F; Bernui, A; de Carvalho, E; Novaes, C P
doi: 10.1088/1742-6596/2678/1/012001pmid: N/A
Abstract. The gravitational dipole approach is suitable for measuring β, the velocity parameter scale and, consequently, fσ8, the product of the cosmic growth rate, f, and the matter density fluctuation on scales of 8 Mpc/h, σ8. In cosmology, measurements of fσ8 are important because they are a powerful tool for constraining alternative gravity models. However, in gravitational dipole analyses, if one uses a survey with incomplete sky coverage, this will certainly bias the measurement of the direction and magnitude of the dipole, which must be corrected accordingly. In this work we follow a new approach developed in ref. [1] to correct gravitational dipole measurements for partial sky data. Specifically, we study the gravitational dipole direction, important information to obtain an unbiased value of β. Our results show that, when comparing the velocity of the Local Group with the gravitational dipole, the correction procedure can actually recover the dipole direction with great precision, ensuring a robust result for β.
Acoustic monitoring humidity effects on the formation of water bridges at sharp contactsSupichayanggoon, Kacharat; Brockman, Theodore; La Rosa, Andres H
doi: 10.1088/1742-6596/2678/1/012010pmid: N/A
Shear-force Acoustic Near-field Microscopy (SANM) and Whispering Gallery Acoustic Sensing (WGAS) are used to evaluate the role of humidity on the formation and rupture of water meniscus bridges that form between a laterally oscillating tapered probe and a flat substrate. SANM monitors the near-field acoustic wave emitted by the meniscus, while WGAS monitors acoustically the probe’s amplitude of oscillation, as a function of the probe-sample distance. In the instances reported here, the SANM/WGAS measurements are performed in frequency modulation modality, which allows to discriminate the elastic and inelastic components of the probe-fluid-substrate interaction. The response signal traces, acquired when the probe first approaches and then retracts from the sample at 56% relative humidity (or below), revealed absence of hysteresis; this result persists when performing the same experiment a few days later. However, as the humidity increases (different trials from 56% to 67% are included) a notorious hysteresis is observed between the approach and retraction traces. The results indicate that, as the probe approaches the substrate, a higher humidity promotes an increase of stochastic instabilities in the probe-fluid-substrate interactions (reflected in higher damping effects on the probe, and instabilities in the probe-sample distance feedback control). However, the elastic response of the water meniscus prevails over damping effect, as revealed by the greater acoustic emission despite a decrease in the probe’s amplitude. These measurements are relevant to investigations on the dynamic behavior of fluids near hydrophobic/philic substrates, and wetting properties of solids and nanotribology phenomena in general.
Mass Generation of the Scalars Bosons in a Left-Right Symmetric Model with two BidoubletsDiaz, Henry; Pereyra Ravinez, O; Lopez Lozano, C
doi: 10.1088/1742-6596/2678/1/012007pmid: N/A
The search for new Physics justified by new discoverys, motivate among others, the realization of new models called Extensions of the Standard Model (ESM) which must include at low energy the Standar Model. (SM) The electroweak symmetry group SU(2)L⊗ U(1)Yto the gauge group with left-right symmetry SU(2)L⊗ SU(2)R⊗ U(1)B−L⊗ 𝒫, represents one of the minimal extensions of the SM, in which 𝒫 is a parity discrete symmetry such that left-right coupling constants satisfied gL= gR, and according to the hierarchy in the symmetry breaking (conditions that must be met by the vacuum expectation values introduced in the model) allow to obtain the SM. The aim of this work is to identify the Higgs boson of the SM, considering a more general scalar potential that must respect all the symmetries (local gauge invariant, discrete symmetries and Lorentz invariant) established in the model. We will take into account those previous works about the hierarchy conditions and certain approximations that must satisfy the vacuum expectation values for obtain greater simplicity in the caculations of scalar masses of the model.
κ-Exponential InflationRibeiro, B W; Cabral, F C
doi: 10.1088/1742-6596/2678/1/012006pmid: N/A
We investigate a possible inflationary scenario where the expansion of the universe is driven by a slow evolution of a homogeneous single scalar field, whose potential V (φ) is given by an unusual κ-generalized power law. Within the slow-roll approximation we obtain several of the main predictions of the model, as the scalar spectral index, the tensor-to-scalar ratio, the number of e-folds, and the local non-Gaussianity. We also show that this model admits a much wider set of solutions than the usual exponential approach, and that their theoretical predictions are contemplated by the observational data.
Matched impedance amplifier design for shear-force acoustic near-field microscopyBrockman, Theodore; Supichayanggoon, Kacharat; La Rosa, Andres H
doi: 10.1088/1742-6596/2678/1/012004pmid: N/A
Efficient detection of the acoustic signal constitutes the most critical aspect in Shear-force Acoustic Near-field Microscopy, for reliably characterize the dynamic response of confined fluids under shear stress. The near-field acoustic emission from the fluid is monitored as the probe gradually approaches to, and subsequently retracts from, the substrate. Herein we report a 7dB improvement in signal-to-noise sensitivity in detecting the acoustic emission from the fluid trapped between a flat sample and the apex of a tapered probe (the latter attached to a quartz tuning fork of 32 kHz resonance frequency). The new design capitalizes on the inherent capacitance of the SANM acoustic sensor (comprising a pile of piezoelectric plates) and a proper matching inductor/capacitance combination to, altogether connected in a tank-circuit fashion, optimize the sensor’s response at 32 kHz. A detailed construction of the circuit amplifier, as well as detailed frequency response bandwidth and noise characterization, is included herein.
Real-time inspection and fault detection for large photovoltaic arrays based on drones and deep learning algorithmsYu, Runze; Cui, Yuxin; Wang, Haoming; Edin, Hans; Salinas, Ener
doi: 10.1088/1742-6596/2678/1/012011pmid: N/A
In recent years, the installation of renewable energy generation systems based on photovoltaic (PV) panels has experienced massive increments and PV parks with thousands of panels are now becoming commonplace. Yet, there are some challenges, like inspection and fault detection. Lately, these operations have been approached using drones. This project adds the use of deep learning, more specifically proposes the convolutional neural network (CNN) algorithm, the YOLOv5 model and Real-Time Messaging Protocol (RTMP) protocol to achieve real-time detection of PV panels failures. The YOLOv5 model was trained by sets sorted into 9 different categories including fault and abnormal objects’ coverage. This multi-class classification system was investigated by a variety of evaluation indexes to show effectiveness and accuracy. The system was also examined with its different fault classes. The performance results demonstrate that the mean average precision could reach up to 98% with a good training set, confirming the feasibility of proposed approaches.
Prefacedoi: 10.1088/1742-6596/2678/1/011001pmid: N/A
PrefaceThe Meeting of Physics is an event initiated by a group of Peruvian scientists, some of whom work abroad. It aims to motivate and promote physics in Peru, presenting the scientific contributions of researchers and students from different Peruvian universities and scientific organizations. This event is also a great opportunity to meet and initiate or continue scientific collaborations with local and international guests some of these are renowned scientists.Unfortunately, during 2020 and 2021 the global pandemic that affected us all also drastically slowed research activities. Despite all these, we managed to continue organizing our Meetings of Physics using online technologies. It took a while for researchers and students to complete their articles for the proceedings and for us to get the corresponding funding, but finally these Joined Proceedings of the XIX and XX Meetings of Physicswere produced.In these Proceedings we present a selection of works that were exhibited in the plenary and parallel lectures, as well as in online “poster” sessions.The editors wish to thank the Faculty of Sciences of the National University of Engineering (UNI) in Lima, Peru, and all those who made it possible the XIX and XX Meetings of Physics.The editorial Committee:Carmen Eyzaguirre (UNI, Peru)Ener Salinas (Hitachi Energy Research, Sweden)Rosendo Ochoa (UNI, Peru)Javier Solano (UNMSM, Peru)