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Dynamical system analysis of Dirac-Born-Infeld scalar field cosmology in coincident f(Q)gravity

Chinese Physics C 2024年第9期48卷 199-209页

作者： Sayantan Ghosh raja solanki P.K.Sahoo Department of Mathematics Birla Institute of Technology and Science-PilaniHyderabad CampusHyderabad-500078India

In this article,we present a dynamical system analysis of a Dirac-Born-Infeld scalar field in a modified f(Q)gravity *** considered a polynomial form of modified gravity,used two different types of scalar potential,polynomial and exponential,and found a closed autonomous dynamical system of *** analyzed the fixed points of such a system and evaluated the conditions under which deceleration to late-time acceleration occurs in this *** note the similarity of the two models and show that our result is consistent with a previous study on Einstein s *** also investigated the phenomenological implications of our models by plotting EoS(ω),energy density(Ω),and deceleration parameter(q)*** e-fold time and comparing to the present *** conclude the paper by observing how the dynamical system analysis differs in the modified f(Q)gravity,and present the future scope of our research.

关键词： Dirac-Born-Infeld field f(Q)gravity dark energy dynamical system analysis

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Cosmic acceleration with bulk viscosity in an anisotropic f(R, Lm) background

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Communications in Theoretical Physics 2023年第7期75卷 103-112页

作者： raja solanki Bina Patel Lakhan V Jaybhaye P K Sahoo Department of Mathematics Birla Institute of Technology and Science-PilaniHyderabad CampusHyderabad-500078India Department of Mathematical Sciences P.D.Patel Institute of Applied SciencesCharotar University of Science and Technology(CHARUSAT)ChangaAnand 388421GujaratIndia

In this article,we investigate the observed cosmic acceleration in the framework of a cosmological f(R,Lm)model dominated by bulk viscous matter in an anisotropic *** consider the locally rotationally symmetric Bianchi type I metric and derive the Friedmann equations that drive the gravitational interactions in f((R,Lm)***,we assume the functional form f(R,Lm)=R/2+Lαm,where a is a free model parameter,and then find the exact solutions of field equations corresponding to our viscous matter dominated *** incorporate the updated H(z)data and the Pantheon data to acquire the best-fit values of parameters of our model by utilizing theχ2 minimization technique along with the Markov Chain Monte Carlo random sampling ***,we present the behavior of physical parameters that describe the Universe’s evolution phase,such as density,effective pressure and EoS parameters,skewness parameter,and the statefinder diagnostic *** find that the energy density indicates expected positive behavior,whereas the negative behavior of bulk viscous pressure contributes to the Universe’s *** effective EoS parameter favors the accelerating phase of the Universe’s ***,the skewness parameter shows the anisotropic nature of spacetime during the entire evolution phase of the ***,from the statefinder diagnostic test,we found that our cosmological f(R,Lm)model lies in the quintessence region,and it behaves like a de-Sitter universe in the far *** analyze different energy conditions in order to test the consistency of the obtained *** find that all energy conditions except strong energy condition(SEC)show positive behavior,while the violation of SEC favors the recently observed acceleration with the transition from decelerated to an accelerated epoch of the Universe’s expansion in the recent past.

关键词： LRS Bianchi type I metric f(R Lm)gravity bulk viscosity skewness parameter equation of state parameter statefinder parameter

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Telemedicine,the current COVID-19 pandemic and the future:a narrative review and perspectives moving forward in the USA

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Family Medicine and Community Health 2020年第3期8卷 50-58页

作者： Asim Kichloo Michael Albosta Kirk Dettloff Farah Wani Zain El-Amir Jagmeet Singh Michael Aljadah raja Chandra Chakinala Ashok Kumar Kanugula Shantanu solanki Savneek Chugh Internal Medicine Central Michigan University College of Medicine East CampusSaginawMichiganUSA Family Medicine Samaritan Medical CenterWatertownNew YorkUSA Medicine Geisinger Commonwealth School of MedicineScrantonPennsylvaniaUSA Internal Medicine Hurley Medical CenterFlintMichiganUSA Nephrology Westchester Medical CenterValhallaNew YorkUSA

A narrative review was conducted to examine the current state of the utilisation of telemedicine amid the current COVID-19 pandemic and to evaluate the benefits of continuing telemedicine usage in the future.A literature review was performed for articles related to *** including PubMed,Google Scholar,Cochrane Library and Ovid MEDLINE were *** reviewers independently performed article selection based on relevance to our *** included all articles between 1990 and 2020 related to telemedicine using the following keywords:‘telemedicine’,‘telehealth’,‘policy’,‘COVID-19’,‘regulation’,‘rural’,‘physical examination’,‘future’.A total of 60 articles were identified,and through careful selection we narrowed the final number of articles to 42 based on relevance to our *** has been rapidly evolving over the past several *** with regulation and reimbursement have prevented its full immersion into the healthcare *** the current pandemic,Centers for Medicare and Medicaid services have expanded access to telemedicine *** advantages of telemedicine moving forward include its cost-effectiveness,ability to extend access to specialty services and its potential to help mitigate the looming physician *** include lack of available technological resources in certain parts of the country,issues with security of patient data,and challenges in performing the traditional patient *** is critically important that changes are made to fully immerse telemedicine services into the healthcare landscape in order to be prepared for future pandemics as well as to reap the benefits of this service in the future.

关键词： services moving landscape

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