Article
Astronomy & Astrophysics
Weiqiang Yang, Supriya Pan, Eleonora Di Valentino, Celia Escamilla-Rivera, Andronikos Paliathanasis
Summary: In this study, the unified bulk viscous scenarios are constrained using observational data from the Cosmic Microwave Background and future detections of Gravitational Wave Standard Sirens. The results suggest the presence of a time-dependent bulk viscosity in the universe, which is likely to be confirmed by future measurements. Additionally, the combination of Gravitational Wave Standard Sirens data with current cosmological probes can improve the accuracy of cosmological parameter measurements.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Zurab Kepuladze, Michael Maziashvili
Summary: This article discusses the coupling of the quintessence field with the cosmic neutrino background as an alternative mechanism to address the coincidence problem. It is found that successful quintessence models coupled with CNB can be obtained from established inflationary models, showing a certain feasibility in this approach.
Article
Astronomy & Astrophysics
Maria Pia Piccirilli, Gabriel Leon
Summary: Unimodular gravity is an alternative theory to general relativity, characterized by the trace-free version of Einstein's field equations. This study explores the possibility of constructing an inflationary phase within the framework of unimodular gravity, where the accelerated expansion is solely driven by a diffusion term. The primordial spectrum during inflation is generated by considering inhomogeneous perturbations associated with standard hydrodynamical matter, and these predictions are compared with observational bounds from Planck 2018 + Bicep2/KECK Array data.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Daniel G. Figueroa, Adrien Florio, Nicolas Loayza, Mauro Pieroni
Summary: This paper discusses the possibility of measuring particle couplings using stochastic gravitational wave backgrounds (SGWBs). It is found that a sequence of stair-like peaks, with each peak probing a different coupling, can emerge in the SGWB spectrum. By detecting this signature, it is possible to reconstruct the couplings of the particle species involved in high energy phenomena that generate SGWBs. Stair-like signatures may arise in causally produced backgrounds in the early Universe.
Article
Astronomy & Astrophysics
Massimo Giovannini
Summary: This study investigates the absorption of high-frequency gravitons by matter during the cosmic evolution, with the sound speed and viscosity of the medium affecting the spectral energy density of the gravitons.
Article
Physics, Multidisciplinary
Akhil Antony, Fabio Finelli, Dhiraj Kumar Hazra, Arman Shafieloo
Summary: We have identified examples of single field inflationary trajectories that go beyond the slow-roll regime and provide a better fit to Planck 2018 data compared to a baseline model. These trajectories also alleviate tensions between different datasets in estimating cosmological parameters. The oscillations in the Hubble flow function and the primordial power spectrum mimic the improvement in Planck data fit seen in other models. The intermediate fast-roll phase can be further tested with large scale structure data and more precise cosmic microwave background polarization measurements.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
C. Wetterich
Summary: The article discusses the possible origin of the universe in the infinite past, suggesting that in the epoch of great emptiness particles are extremely rare and effectively massless, and that there is no physical big bang singularity.
Article
Astronomy & Astrophysics
A. Salehi, M. Yarahmadi, S. Fathi, Kazuharu Bamba
Summary: The study investigates the bulk flow of the local universe using Type Ia supernova data, finding agreement with the ΛCDM model at low redshifts but disagreement at high redshifts. The results support previous studies suggesting a large bulk flow in the universe.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Yann Mambrini, Keith A. Olive, Jiaming Zheng
Summary: Dark matter may only interact with the visible sector at high energy scales. During the period of reheating, the dominant process of dark matter production is through the decay products of the inflaton. This process dominates for low reheating temperatures and can produce the required density of dark matter.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
Marcos A. G. Garcia, Kunio Kaneta, Yann Mambrini, Keith A. Olive
Summary: The perturbative decay of the inflaton and the effects of non-instantaneous reheating on temperature and final state mass were investigated. It was found that the spin statistics of the final state can affect the temperature evolution, and the final state mass can lead to kinematic suppression or enhancement.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Physics, Multidisciplinary
M. J. S. Houndjo, M. G. Ganiou, F. M. Kombetto, J. Tossa
Summary: In this paper, we investigate the f(T) theory of gravity coupled with scalar field and its reconstruction in the context of an exponential evolution of the scale factor. The impact of algebraic function on the slow-roll parameters is analyzed, and the results demonstrate the consistency of the reconstructed model with the recent data.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Astronomy & Astrophysics
F. S. Mirtalebian, Kourosh Nozari, Tahereh Azizi
Summary: This paper presents reheating constraints on an inflationary universe induced by perfect fluid models, outlining the procedure to calculate inflationary observables and reheating. By restricting the equation-of-state parameter in the reheating stage, more stringent constraints can be derived for the model's parameter space, corresponding to viable values of the scalar spectral index ns and tensor-to-scalar ratio r released by Planck2018 observational data.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Yanou Cui, Evangelos I. Sfakianakis
Summary: This article investigates the production of gravitational waves during preheating in hybrid inflation models, where an axion-like waterfall field couples to Abelian gauge fields. The study finds that the gravitational wave signal from these models can be detected by foreseeable gravitational wave experiments such as LISA, AEDGE, ET, and CE, and is comparable to that of LIGO A+ in terms of frequency range and signal strength. Additionally, the resulting gravitational wave signal is helically polarized, which distinguishes it from other sources of stochastic gravitational wave background. Furthermore, these models can generate primordial black holes that can constitute dark matter and contribute to merger events detectable by gravitational wave detectors.
Article
Mathematics, Interdisciplinary Applications
Eman M. Moneer, Andre Fabiano Steklain, Fredy L. Dubeibe, Norah A. M. Alsaif, Euaggelos E. Zotos
Summary: In this paper, the dynamical evolution of the Bianchi IX Universe under the influence of inflation caused by a self-interacting scalar field was numerically investigated. The existence of chaos in the system was explored through the calculation of basin diagrams using both the grid method and the smaller alignment index (SALI) method. It was found that in the presence of inflation, the fractal structures tend to disappear in the basin diagrams, indicating the possible suppression of chaos in the inflationary Bianchi IX cosmology.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Multidisciplinary Sciences
Jeff Steinhauer, Murad Abuzarli, Tangui Aladjidi, Tom Bienaime, Clara Piekarski, Wei Liu, Elisabeth Giacobino, Alberto Bramati, Quentin Glorieux
Summary: The authors discuss the fluid-like behavior of light and propose an analogy of cosmological particle creation using a quantum fluid of light. They report the spontaneous creation of analogue cosmological particles in the laboratory, confirming predictions from quantum field theory. This work introduces the concept of a cold quantum fluid of light.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Chemical
N. S. Hirulkar, P. R. Jaiswal, P. N. B. Reis, J. A. M. Ferreira
Summary: This study investigated the impact of hygrothermal aging and cyclic thermal shocks on the flexural properties of single-lap adhesive joints. The research found that higher hygrothermal aging temperatures led to greater decreases in failure load and maximum failure displacement, while thermal shocks in air had minimal effects. Additionally, flexural properties significantly degraded with an increasing number of hygrothermal shocks, with water/air environments proving to be more severe than water/water environments.
JOURNAL OF ADHESION
(2021)
Article
Green & Sustainable Science & Technology
Soumik Bhattacharya, Swarupa Das, Sandipan Das, Mahesh Kalashetty, Sumedh R. Warghat
Summary: Geospatial methods combined with multi-influencing factors were used to determine potential groundwater zones in Purulia District, Eastern India. The study generated a groundwater prospect map with different zones, providing valuable information for future research and groundwater development planning.
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2021)
Article
Physics, Multidisciplinary
S. P. Ramteke, S. M. Azhar, G. G. Muley, M. Baig, A. M. Alshehri, H. H. Somaily, Mohd Anis
Summary: The study utilized L-ascorbic acid (LAA) organic ligand for the first time to tune the optical properties of copper sulphate (CuS) single crystal. Various experimental techniques were employed to evaluate the structural parameters and optical properties of the crystals. The results demonstrated that the influence of LAA on CuS enabled it to switch the nonlinear refraction behavior of the crystal.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Computer Science, Hardware & Architecture
Vaibhav R. Pandit, R. J. Bhiwani
Summary: Better visual interpretation and high-level feature extraction are desired for remotely sensed image processing applications, especially when fusing Multi-Spectral (MS) and PANchromatic (PAN) images to produce MS images with enhanced spatial resolution. In this paper, a morphological operator-based image fusion algorithm is proposed for nonlinear decomposition, along with spatial filtering using morphological operators to enhance efficiency of existing image fusion algorithms based on CS, MRA, and deep learning approaches. The potential of the proposed method is demonstrated through evaluation using two data sets from WorldView-3 and WorldView-2 satellite sensors.
COMPUTERS & ELECTRICAL ENGINEERING
(2021)
Review
Biotechnology & Applied Microbiology
M. Rai, A. P. Ingle, P. Ingle, I. Gupta, M. Mobin, A. Bonifaz, M. Alves
Summary: Dematiaceous hyphomycetes are darkly pigmented fungi found worldwide as plant pathogens and saprophytes, with many emerging as opportunistic pathogens causing infections such as mycotic keratitis. The lack of timely diagnosis and effective pharmacological drugs contribute to increased morbidity and visual impairment in individuals with such infections.
JOURNAL OF APPLIED MICROBIOLOGY
(2021)
Article
Environmental Sciences
Herbert Gonzaga Sousa, Valdileia Teixeira Uchoa, Suzana Maria Galvao Cavalcanti, Pedro Marcos de Almeida, Mariana Helena Chaves, Jose De Sousa Lima Neto, Paulo Humberto Moreira Nunes, Joaquim Soares da Costa Junior, Mahendra Rai, Iolanda Souza Do Carmo, Elcilene Alves de Sousa
Summary: Through chemical analysis and antioxidant activity testing, this study found that Combretum leprosum Mart. plant's leaves and stem bark contain abundant health-beneficial compounds, with no significant impact on cytogenotoxic activity.
JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH-PART A-CURRENT ISSUES
(2021)
Article
Astronomy & Astrophysics
S. D. Katore, S. P. Hatkar, P. S. Dudhe
Summary: This study explores the Friedmann-Robertson-Walker space-time in the presence of domain walls within the framework of f(G) theory of gravitation. A generalization of linearly varying deceleration parameter is proposed, with observations indicating an accelerating and expanding universe. The state finder parameters closely resemble those of the ΛCDM model, and various physical parameters of the models are discussed in detail.
Article
Physics, Multidisciplinary
A. Y. Shaikh, A. S. Shaikh, K. S. Wankhade
Summary: This article introduces the perfect fluid in plane symmetric space-time using hybrid expansion law in the framework of teleparallel gravity. The behavior of accelerating Universe is discussed by considering the depiction model of f(T) gravity, and the geometrical and physical parameters of the model are studied. The effective equation of state, basic thermodynamic equations, thermodynamic temperature, and entropy density of the model are investigated and discussed, along with analysis on statefinder and jerk parameters to distinguish the model from other dark energy models.
PRAMANA-JOURNAL OF PHYSICS
(2021)
Article
Agronomy
Ashok K. Srivastava, Mangla N. Bansod, N. Khare
Summary: The Purna alluvial basin in central India is filled with Quaternary sediments and has a variety of pedogenic and non-pedogenic calcretes. The area has experienced subtropical, arid, and semiarid climates, leading to the formation of nodular calcretes, hardpan, and groundwater calcretes. The presence of well preserved rhizolith balls and rhizospheres in the palaeosols suggest different climatic conditions in the past.
Article
Physics, Mathematical
Alfred Y. Shaikh
Summary: In this study, bouncing cosmological models based on the non-metricity scalar Q in the f(Q) gravity theory are presented. Two models are shown, one with a linear dependence of the Lagrangian f(Q) on Q and the other with a polynomial functional form. It is found that the parameters of the models depend largely on their behavior. The equation of state parameter demonstrates the bouncing behavior of the Universe. It is important to note that these built-in cosmological models violate energy requirements. The kinematical and physical characteristics of the models are also analyzed.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2023)
Article
Physics, Multidisciplinary
A. Y. Shaikh
Summary: I study the behavior of cosmic transit in the expanding cosmos using symmetric teleparallel gravity. I achieve the exact solution for the field equations by employing the well-known deceleration parameter, time changing deceleration parameter q=-1+?/1+a?, with ? > 0. I investigate the viability and physical reliability of this deceleration parameter by considering observational constraints, and discuss several energy conditions in this context.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Physics, Multidisciplinary
A. Y. Shaikh
Summary: This study examines the cosmic evolution of a scenario with dark energy and matter in the framework of f(T) gravity theory. Renyi holographic dark energy and Tsallis holographic dark energy models with Hubble's cut-off are investigated. The energy densities of both models increase with redshift z, supporting the expanding behavior of the universe. The models transition from the quintessence phase to the Lambda CDM model and eventually slope towards the phantom region, depending on the value of delta. The validity of the models is also checked using statefinder diagnostic parameters.
INDIAN JOURNAL OF PHYSICS
(2023)
Review
Infectious Diseases
Mahendra Rai, Shital Bonde, Alka Yadav, Yulia Plekhanova, Anatoly Reshetilov, Indarchand Gupta, Patrycja Golinska, Raksha Pandit, Avinash P. Ingle
Summary: The COVID-19 pandemic has put global pressure on the healthcare system, necessitating the development of rapid tests for early detection and bulk screening of infected individuals. Nanotechnology provides promising solutions for diagnosis, drug delivery, and therapy. This review discusses the use of nanomaterials for COVID-19 control, including diagnosis, vaccines, and drug delivery systems.
EXPERT REVIEW OF ANTI-INFECTIVE THERAPY
(2022)
Article
Energy & Fuels
Mohammad Akram Syed, Gunwant Ajabrao Dhomane
Summary: Energy management and control play a crucial role in the revolutionary era of power system, with a focus on developing and adopting strategies for real-time supervision and efficiency. The research explores the impact of energy management strategy on a hybrid renewable energy system, aiming to enhance utilization of renewable energy resources. The analysis of different cases and effectiveness of the strategy on the hybrid system are presented in the study.
INTERNATIONAL JOURNAL OF RENEWABLE ENERGY RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Ashok K. Srivastava, Ajab Singh
Summary: Geochemical analysis and 40Ar/39Ar dating of glass shards from the Toba ash in the Purna basin, India show discrepancies with the expected composition and age of the Youngest Toba Tuff, indicating potential geological issues.
JOURNAL OF EARTH SYSTEM SCIENCE
(2021)
