Article
Astronomy & Astrophysics
De-Shuang Meng, Chen Yuan, Qing-Guo Huang
Summary: In this study, we calculate the one-loop correction to the curvature power spectrum with local-type non-Gaussianities. We find a perturbativity condition that provides a stringent constraint on the relevant inflation models for the formation of primordial black holes.
Article
Thermodynamics
Yu Han, Yingying Sun, Junjie Wu
Summary: Solar-aided power generation (SAPG) is an effective method for clean and efficient electricity production, utilizing non-concentrating solar energy and air preheating process to achieve low-cost and efficient solar/coal hybrid power generation, resulting in increased coal-based thermal efficiency and reduced exergy loss.
Article
Quantum Science & Technology
M. F. Melalkia, J. Huynh, S. Tanzilli, V D'Auria, J. Etesse
Summary: In this work, we propose an innovative approach that simplifies the preparation of non-Gaussian states compared to previous proposals by utilizing modern quantum photonics tools. Our protocol relies on a single projective measurement along a mode that partially overlaps with all the input modes, enabling parallel execution and showcasing its straightforward feasibility. We demonstrate that our protocol can generate high-quality and high-amplitude Schrodinger cat states as well as more complex states such as error-correcting codes.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Tomonori Hirano, Akihiro Morita
Summary: The paper resolves basic issues in extracting interface signals from time correlation functions through examining the influences of the boundary and quadrupole contribution. It establishes a proper treatment method and affine center to minimize the quadrupole effect. The research is important for reliable spectroscopic analysis.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Mathematics, Applied
Jiaxi Gu, Jae-Hun Jung
Summary: This paper introduces the use of Gaussian radial basis function finite difference method to solve singular perturbation problems on uniform grids, demonstrating the possibility of achieving non-oscillatory and accurate solutions through the adaptivity of the shape parameter, even with a small number of grid points. The optimal value of the shape parameter can lead to non-oscillatory and accurate solutions, and in some cases, the error can vanish completely. The paper also suggests choosing the optimal shape parameter to minimize error using the total variation norm of the numerical solution.
APPLIED MATHEMATICS LETTERS
(2021)
Article
Engineering, Multidisciplinary
Yaoyuan Hu, Bingfeng Ju
Summary: This paper presents an adaptive scanning path generation method based on geometry information, which reduces data amount, increases scanning speed, and preserves sufficient geometric information for performance evaluation. The method generates grid points iteratively by obtaining surface geometry knowledge step by step, focusing on curvature properties. The proposed method promises better surface reconstruction completeness and performance evaluation correctness, with simulations and experimental verifications showing its efficiency.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Thermodynamics
H. Vaidya, C. Rajashekhar, G. Manjunatha, A. Wakif, K. Prasad, I. L. Animasaun, K. Shivaraya
Summary: Homogeneous and heterogeneous reactions are essential in various processes, including combustion, polymer production, and biochemical procedures. This study investigates the impact of these reactions on the peristaltic flow of MHD Jeffrey fluid and conducts entropy generation analysis to evaluate their effects. The research shows potential applications in both industry and medicine.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Thomas Christopoulos, Emmanouil E. Kriezis, Odysseas Tsilipakos
Summary: This article proposes an efficient method for analyzing third harmonic generation in nanoparticles and metasurfaces incorporating 2D materials, based on numerically calculating the quasinormal modes in the nanostructure. Unlike conventional coupled-mode theory approaches, this method does not require any prior assumptions regarding the number of resonances involved in the conversion process.
Article
Engineering, Mechanical
Song Cui, Enlai Zheng
Summary: ZMNL methods are useful for fatigue tests, but can cause distortions in ASD and CSD when the target PSD has a large dynamic range. A novel method is proposed in this study to generate non-Gaussian signals using a pseudo reference PSD with flat ASDs, which helps to avoid PSD distortions and recover kurtoses of the signals through iterative processes. The feasibility and effectiveness of the method are validated on a numerical model, and two control schemes based on the proposed method show promising results in eliminating the mismatch between target and measured PSD in shaker table tests.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Physics, Multidisciplinary
Yagang Zhang, Zhenkun Wu, Kaibo Yang, Peng Li, Feng Wen, Yuzong Gu
Summary: A new complex-structured light field is formed based on the non-coaxial interference of Bessel-Gaussian (BG) beams, showing various phenomena of phase singularities and controllable transitions between vortex chains and vortex singularities. The research also demonstrates that the net TCs of the composite light field is not always equal to the sum of the TCs of the original beams. These results are significant for laser calibration and complex particle manipulation.
Article
Chemistry, Physical
Ravi Kumar, Aryya Ghosh, Nayana Vaval
Summary: Molecules can relax through intermolecular Coulombic decay or electron transfer-mediated decay processes. This study investigated the effects of charge and solvation shell on the relaxation process. Calculations were done on Na+-(H2O)(n) and Mg2+-(H2O)(n) micro-solvated clusters to determine the ionization potential, double ionization potential, and lifetime of Na-2s and Mg-2s temporary bound states. The findings highlight the influence of metal ions' charge, solvation shell structures, and the number of water molecules on the decay rate. The relevance of these systems to the human body adds significance to this study.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Ernest Opoku, Filip Pawlowski, J. V. Ortiz
Summary: This article introduces a new method for calculating self-energies that surpasses previous methods in terms of accuracy, efficiency, and interpretability. It also presents an improved algorithm to overcome convergence difficulties. Numerical tests show that the new non-diagonal, renormalized methods are slightly more accurate than their diagonal counterparts, but come with increased computational complexity.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Zachary M. Sparrow, Brian G. Ernst, Paul T. Joo, Ka Un Lao, Robert A. DiStasio
Summary: NENCI-2021 presents a benchmark database of 8000 intermolecular complexes for chemical sciences, systematically sampling potential energy surfaces and close contacts, providing valuable data for testing, training, and developing various chemical simulation methods.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Acoustics
Junqing Zhang, Liming Shi, Mads Graesboll Christensen, Wen Zhang, Lijun Zhang, Jingdong Chen
Summary: Personal sound zone (PSZ) is a technique that uses an array of loudspeakers and digital signal processing tools to control spatial soundfield. This study presents a robust pressure matching (RPM) algorithm for sound zone generation, which models the acoustic transfer functions (ATFs) using a complex Gaussian mixture model (CGMM). The algorithm takes into account the effect of ATF perturbations and achieves better signal distortion energy and signal to interference ratio compared to traditional methods.
IEEE-ACM TRANSACTIONS ON AUDIO SPEECH AND LANGUAGE PROCESSING
(2023)
Article
Chemistry, Physical
Elena F. Belogolova, Sergey A. Shlykov, Alexey V. Eroshin, Evgeniya P. Doronina, Valery F. Sidorkin
Summary: The research revised the geometry of silatranes and resolved the contradiction regarding the sensitivity to the medium effect. Despite studying a series of silatranes, quantum chemical methods struggled to accurately reproduce the experimental values. A reasonable hierarchy of computational theory levels for studying non-covalent intramolecular interactions involving silicon and nitrogen can only be constructed at specific distances.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Astronomy & Astrophysics
Juan P. Beltran Almeida, Josue Motoa-Manzano, Cesar A. Valenzuela-Toledo
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2017)
Article
Astronomy & Astrophysics
Yeinzon Rodriguez, Juan P. Beltran Almeida, Cesar A. Valenzuela-Toledo
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2013)
Article
Astronomy & Astrophysics
Juan P. Beltran Almeida, Yeinzon Rodriguez, Cesar A. Valenzuela-Toledo
Article
Astronomy & Astrophysics
Juan P. Beltran Almeida, Alejandro Guarnizo, Ryotaro Kase, Shinji Tsujikawa, Cesar A. Valenzuela-Toledo
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2019)
Article
Astronomy & Astrophysics
Miguel Alvarez, J. Bayron Orjuela-Quintana, Yeinzon Rodriguezi, Cesar A. Valenzuela-Toledo
CLASSICAL AND QUANTUM GRAVITY
(2019)
Article
Astronomy & Astrophysics
Juan R. Beltran Almeida, Alejandro Guarnizo, Ryotaro Kase, Shinji Tsujikawa, Cesar A. Valenzuela-Toledo
Article
Physics, Particles & Fields
Juan P. Beltran Almeida, Josue Motoa-Manzano, Cesar A. Valenzuela-Toledo
JOURNAL OF HIGH ENERGY PHYSICS
(2019)
Article
Astronomy & Astrophysics
Juan P. Beltran Almeida, Alejandro Guarnizo, Cesar A. Valenzuela-Toledo
CLASSICAL AND QUANTUM GRAVITY
(2020)
Article
Astronomy & Astrophysics
Josue Motoa-Manzano, J. Bayron Orjuela-Quintana, Thiago S. Pereira, Cesar A. Valenzuela-Toledo
Summary: This paper investigates a triad of inhomogeneous scalar fields, known as solid, as a source of homogeneous but anisotropic dark energy. The study finds that anisotropic accelerated solutions can be realized as attractor points for suitable choices of model parameters. Numerical solutions show that the model can describe significant spatial shear within observational bounds, even when set to zero at early times, and a particular region in the model's parameter space where the Universe isotropizes is identified.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Astronomy & Astrophysics
J. Bayron Orjuela-Quintana, Cesar A. Valenzuela-Toledo
Summary: This paper investigates the late time cosmology of a non-canonical scalar field coupled to a vector field in a Bianchi-I background, showing that anisotropic dark energy fixed points can be attractors for certain parameters and that oscillations in the equation of state of dark energy and shear may occur at late times when the coupling of the k-essence field to the vector field is strong enough.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Astronomy & Astrophysics
Wilmar Cardona, J. Bayron Orjuela-Quintana, Cesar A. Valenzuela-Toledo
Summary: We investigated scalar-vector-tensor (SVT) theories with second-order equations of motion and tensor propagation speed equivalent to the speed of light. By utilizing sub-horizon and quasi-static approximations, we derived analytical formulae for various properties of the effective dark energy fluid, including sound speed, anisotropic stress, energy density, and pressure. We demonstrated that it is possible to design SVT cosmological models that are degenerate with Lambda CDM at the background level while exhibiting different gravity strength and non-zero dark energy perturbations. Furthermore, we implemented SVT designer models in a popular Boltzmann solver called CLASS, enabling the testing of SVT models against astrophysical observations. Our effective fluid approach to SVT models highlights interesting behaviors in the sound speed and the anisotropic stress, which warrant further investigation given the current discrepancies in cosmological parameters such as H-0 and sigma(8).
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Santiago Garcia-Serna, J. Bayron Orjuela-Quintana, Cesar A. Valenzuela-Toledo, Hernan Ocampo Duran
Summary: Dynamical system theory is widely used in cosmological model analysis. We present an example of a dark energy model where not all fixed points can be analytically found and propose a general scheme for numerical analysis of the parameter space. This work can serve as a template for analyzing highly complicated dynamical systems numerically.
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
(2023)
Article
Astronomy & Astrophysics
Alejandro Guarnizo, J. Bayron Orjuela-Quintana, Cesar A. Valenzuela-Toledo
Article
Astronomy & Astrophysics
Juan P. Beltran Almeida, Alejandro Guarnizo, Lavinia Heisenberg, Cesar A. Valenzuela-Toledo, Jann Zosso
Article
Astronomy & Astrophysics
Juan P. Beltran Almeida, Yeinzon Rodriguez, Cesar A. Valenzuela-Toledo
MODERN PHYSICS LETTERS A
(2013)
