Article
Physics, Mathematical
Vinod Kumar Bhardwaj, Archana Dixit, Anirudh Pradhan
Summary: In this paper, the viability of the Bianchi type-V universe in the Brans-Dicke theory of gravitation is examined. The interaction and non-interaction scenarios between dark matter and dark energy are discussed within the framework of the theory. The results are found to agree with observations, with a distinctive change in the deceleration parameter and the presence of a transition red-shift.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2023)
Article
Physics, Multidisciplinary
S. P. Hatkar, G. D. Karhale, S. D. Katore
Summary: In this paper, we investigated the impact of bulk viscosity on spherically symmetric space-time within the framework of Brans-Dicke theory (BBT) of gravitation. Our findings show that the Universe undergoes acceleration for small values of the expansion scalar and deceleration for large values of the expansion scalar. The coefficient of bulk viscosity is negative and in Case I the wormhole is compact, while in Case II it is proportional to energy density and positive, resulting in a non-compact wormhole. The necessary conditions for the existence of the wormhole are satisfied.
PRAMANA-JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Mou Xu, Jianbo Lu, Shining Yang, Hongnan Jiang
Summary: The study explores the correction of thermodynamic entropy for a spherically symmetric black hole under the modified gravity theory called generalized Brans-Dicke theory. The effect of the entropy-correction term on the entropy is significant for small event horizon radii, but becomes negligible for larger values. Additionally, the heat capacity of black holes in the GBD theory undergoes a phase transition from negative to positive values as the event horizon radius increases.
Article
Physics, Multidisciplinary
Sasmita K. Pradhan, Z. Naik, S. K. Tripathy
Summary: In this work, the little rip and pseudo rip scenarios in the framework of the generalised Brans-Dicke (GBD) theory are studied, considering an evolving BD parameter and a self-interacting potential. The GBD field equations are derived for an anisotropic space time, providing a more general approach to cosmic expansion. The evolutionary behavior of the BD scalar field, dynamical BD parameter, and the self-interacting potential are investigated. It is found that the dynamical BD parameter cannot be separated into distinct evolving and non-evolving parts for the rip scenarios, unlike the case of a constant deceleration parameter. The little rip behavior requires a positive value for the GBD parameter, while a small negative value around -1.33 favors a pseudo rip behavior.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Astronomy & Astrophysics
Soumya Chakrabarti
Summary: The extended scalar-tensor theory of gravity includes two interacting scalar fields, with scalar profiles as a function of redshift obtained through analysis and model parameter constraints from observational data. The evolution of the Universe, including effective equation of state, matter density contrast, and thermodynamic equilibrium, is studied and compared with the ACDM cosmology model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Alexandre M. R. Almeida, Julio C. Fabris, Mahamadou Hamani Daouda, Richard Kerner, Hermano Velten, Willian S. Hipolito-Ricaldi
Summary: This paper introduces a unimodular version of the Brans-Dicke theory with a constrained Lagrangian formulation, resulting in traceless field equations. The vacuum solutions in the cosmological background reproduce the solutions of the usual Brans-Dicke theory with an additional cosmological constant term. A perturbative analysis of the scalar modes reveals both stable and unstable configurations, contrasting with the Brans-Dicke case where only stable configurations occur. However, the tensorial modes remain unchanged in this theory compared to the traditional Brans-Dicke theory.
Article
Astronomy & Astrophysics
Kunio Kaneta, Kin-ya Oda, Motohiko Yoshimura
Summary: This paper presents a cosmological analysis of extended Jordan-Brans-Dicke (eJBD) gravity in the Einstein metric frame. It is the first systematic investigation of how to introduce the lagrangian of standard particle physics in the eJBD framework consistently. The study is significant for understanding the time evolution of eJBD gravity and its compatibility with observational and laboratory bounds.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Vinita Khatri, C. P. Singh
Summary: This paper studies the dynamics of a flat Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmological model with varying vacuum energy density (VED) in Brans-Dicke (BD) cosmology. Two models, ARG1 and ARG2, are considered and their cosmological parameters are solved using a theoretical method. ARG1 model does not show a transition phase while ARG2 model describes the transition from deceleration to acceleration. The results show that the varying VED model in BD theory is consistent with data and the cosmic evolutions align with the concordance ACDM and BD models with constant A.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Physics, Multidisciplinary
M. Sharif, Amal Majid
Summary: In this paper, an anisotropic cosmological solution is computed through a minimal geometric deformation on a non-static spherical spacetime within the framework of self-interacting Brans-Dicke theory. The physical behavior, viability, and stability of the extended FLRW solution are investigated for different values of the equation of state parameter. It is concluded that the solution is viable and stable for the massless scalar field and the radiation dominated universe.
Article
Astronomy & Astrophysics
M. Vijaya Santhi, T. Chinnappalanaidu, S. Srivani Madhu, Daba Meshesha Gusu
Summary: In this article, the Bianchi type-II, VIII, and IX spatially homogeneous and anisotropic space-times in the background of the Brans-Dicke theory of gravity are analyzed within the framework of viscous holographic dark energy. The obtained models show an expanding and accelerating Universe, which is in better agreement with the latest experimental data.
ADVANCES IN ASTRONOMY
(2022)
Article
Astronomy & Astrophysics
Diksha Trivedi, A. K. Bhabor
Summary: The study investigates the Five dimensional anisotropic Bianchi type-III cosmological model within the framework of Brans-Dicke scalar-tensor theory of gravitation. It considers Dark Energy fluid and cosmic strings as a source of energy-matter field and determines two universe models using Berman's special law of variation and power law relation. The physical and kinematical parameters of the model are also discussed for both scenarios.
Article
Physics, Particles & Fields
Hatice Ozer, Ozgur Delice
Summary: The study investigates weak field gravitational wave solutions in Brans-Dicke theory with a cosmological constant, revealing massless scalar waves and their effects on free particles and polarization properties. The analysis also includes the role of the cosmological constant in these phenomena and discusses the energy flux of these waves, leading to an extension of the Cosmic no Hair Conjecture to BD theory with a cosmological constant.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Multidisciplinary
M. Sharif, Amal Majid
Summary: In this paper, black hole solutions are formulated through extended gravitational decoupling scheme in the framework of self-interacting Brans-Dicke theory. The addition of a new source in the matter distribution increases the degrees of freedom in the system of field equations. Three solutions corresponding to different values of the decoupling parameter in the presence of a massive scalar field are obtained, with two solutions classified as having normal matter as their source.
Article
Physics, Multidisciplinary
Paritosh Verma
Summary: This article presents a calculation method for gravitational radiation from an oscillating rod in Brans-Dicke theory. The method is applied to a toy problem, without rigorous derivation. By calculating the explicit expressions for the polarizations and the power radiated in gravitational waves, the problem of gravitational radiation from an oscillating rod is addressed. The problem is motivated by Eddington's spinning rod.
ANNALEN DER PHYSIK
(2022)
Article
Astronomy & Astrophysics
Md Sabir Ali, Sourav Bhattacharya, Shagun Kaushal
Summary: This study demonstrates that the existence of regular black hole or star solutions in the Brans-Dicke theory requires specific boundary conditions, reducing the theory to general relativity. By assuming the absence of naked curvature singularities, we provide numerical computations and analysis to support this conclusion.
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
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
Biochemical Research Methods
Revati Dighade, Ranjit Ingole, Pramod Ingle, Aniket Gade, Sunil Hajare, Maheshkumar Ingawale
Summary: The study demonstrated the nephroprotective effect of silver nanoparticles (AgNPs) synthesized by Bryophyllum pinnatum against ethylene glycol-induced urolithiasis in rats, showing significant improvement in renal function indicators and beneficial effects on kidney tissue.
IET NANOBIOTECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
A. Y. Shaikh, S. V. Gore, S. D. Katore
Summary: This paper investigates the model of f(T) gravity in the presence of dark matter and modified holographic Ricci dark energy in locally rotationally symmetric (LRS) Bianchi type-I space-time. By considering volumetric power and exponential expansion laws, a physically realistic solution of the field equations is achieved. The study includes plotting cosmological parameters for dark energy components with redshift, investigating the accelerated expansion of the Universe, and analysing the Statefinder diagnostic pair and jerk parameter to characterize different phases of the Universe.
PRAMANA-JOURNAL OF PHYSICS
(2021)
Review
Microbiology
Mahendra Rai, Shital Bonde, Patrycja Golinska, Joanna Trzcinska-Wencel, Aniket Gade, Kamel A. Abd-Elsalam, Sudhir Shende, Swapnil Gaikwad, Avinash P. Ingle
Summary: Nanotechnology has revolutionized various fields such as medicine and agriculture through the synthesis of nanoparticles by fungi, particularly in the biosynthesis of silver nanoparticles. Fungi, especially Fusarium species, have shown to be versatile in synthesizing nanoparticles with potential applications in medicine and agriculture.
Review
Biotechnology & Applied Microbiology
Mahendra Rai, Beata Zimowska, Surbhi Shinde, Marcus Tres
Summary: Modern agriculture is striving for sustainable plant production by implementing eco-friendly technologies, with bioherbicides showing great potential in managing harmful weeds while being environmentally friendly and economically viable.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2021)
Article
Biochemical Research Methods
Sudhir Shende, Rahul Bhagat, Rajesh Raut, Mahendra Rai, Aniket Gade
Summary: Phytopathogens cause significant losses in agriculture, with fungal phytopathogens being particularly hard to control. Copper nanoparticles synthesized using myco-fabrication show promise as a potential alternative to traditional fungicides. The study successfully synthesized CuNPs using Aspergillus flavus and tested their antifungal effect on selected fungal crop pathogens.
IEEE TRANSACTIONS ON NANOBIOSCIENCE
(2021)
Article
Chemistry, Analytical
Shailesh R. Jaiswal, Pankaj A. Nagpure, Shreeniwas K. Omanwar
Summary: This study synthesized YF3:Gd3+, Eu3+ fluoride phosphor using a soft chemical route, and investigated the energy transfer from Gd3+ to Eu3+ and subsequent downconversion luminescence, revealing a quantum efficiency of approximately 189%, making it a suitable option for mercury-free fluorescence lamps.
Article
Astronomy & Astrophysics
S. H. Shekh, S. D. Katore, V. R. Chirde, S. V. Raut
Summary: This study investigates the dynamical properties of isotropic and homogeneous FRW space-time filled with Holographic dark energy fluid and cosmic strings in various f(G) gravity models, including linear, quadratic, and inverse models. The model shows singular behavior at an initial epoch, with the contribution of the Gauss-Bonnet term in linear and quadratic models resembling a cosmological constant. This supports the observational fact that dark energy constitutes around 73% of the energy in the universe, as seen in various high precision observational experiments such as the WMAP satellite experiment.
Article
Astronomy & Astrophysics
S. P. Hatkar, S. D. Katore
Summary: In this study, a variable relation between the densities of cosmic strings was proposed and explored in Bianchi type II, VIII, and IX space-times within the framework of general relativity. By assuming that the shear scalar is proportional to the expansion scalar, the field equations were solved and three different cases were investigated. It was observed that cosmic strings significantly contribute to the isotropy and acceleration of the universe.
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.
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)
