35th Annual Report (2022-2023) - ENGLISH

168 AreaofResearch: General Relativity, Theoretical Astrophysics, Compact stars; Darkmatter; Alternative Theory of Gravity; Wormhole Physics, Cosmology. The Department of Physics, Aliah University has started functioning as a host of ICARD th on and from 14 Sept. 2022 after receiving the approval from the competent authority. The Dept. of Physics has a strong teaching and research programme. Earlier a compulsory elective paper on “General Theory of Relativity and Astrophysics” and M.Sc. project on Astrophysics was offered to M.Sc. Final year students. From this semester in new CBCS curricula, we are offering two semester course (12 credit) in General Relativity, Astrophysics and Cosmology to M.Sc. students along with M.Sc. project (4 credit) on Astrophysics and Cosmology. 17 students are enrolled to take this course in newCBCS curricula. Prof. Md. Mehedi Kalam, Coordinator, ICARD, Prof. Debades Bandopadhyay, Honorary Visiting Professor and Former Head, Astro- particle Physics Division, SINP, Dr. Sajahan Molla, a visiting associate of IUCAA, other associates of nearby institutions along with the research scholars of Astrophysics group are the active members of ICARD, Aliah University. The members associated with ICARD, Aliah University have worked on different issues related to the areas of Astrophysics and Cosmology as mentioned earlier during the assessment period. We have worked on the Research work done in ICARD : (Activities th st from14 Sept.2022to31 March2023) possible existence of the dark-matter- admixed pulsars in the disk region of the Milky Way galaxy by using Navarro–Frenk–White (NFW) dark-matter density profile. Also, we have, together with other members, discussed an analytical model on low-mass strange stars based on the Heintzmann ansatz in (2+1) dimension. Attractive anisotropic force plays a significant role in restricting the uppermass limit (which is comparatively low) of the strange star. We have applied our model to some low-mass strange stars and see that it is useful to predict important parameters of the low-mass strange stars. Also, we investigated the possibility of presence of static, spherically symmetric and traversable Lorentzian wormholes in an emergent universe (EU). A non-singular emergent universe (EU) scenario within the realm of standard Relativistic physics requires a generalization of the equation of state (EoS) connecting the pressure and energy density. This generalized EoS is capable of describing a composition of exotic matter, dark energy and cosmological dust matter. Since the EU scenario is known to violate the null energy condition (NEC), we investigate the possibility of presence of static, spherically symmetric and traversable Lorentzian wormholes in an EU. The obtained shape function is found to satisfy the criteria for wormhole formation, besides the violation of the NEC at the wormhole throat and ensuring traversability such that tidal forces are within desirable limits. Also, the wormhole is found to be stable through linear stability analysis. Most importantly, the numerical value of the EU parameter B have SFH is preferred for the formation of star clusters in an enrichedmedium List of publications by using ICARD facilities: 1. Star formation histories of dwarf and giant galaxies with different supernovae-drivenoutflows: NGC 2403, NGC 628 Suparna Sau , T anuka Chattopadhya , Pratap Ray New Astronomy, 2023, 100. 2. Investigation of the effect of bars on the properties of spiral galaxies: a multivariate statistical analysis, P r a s e n j i t B a n e r j e e , T a n u k a Chattopadhyay and Asis Kumar Chattopadhyay, Communications in S t a t i s t i c s - S i m u l a t i o n a n d Computation, 2022. 3. C omp a r i s o n amo n g d i f f e r e n t c l u s t e r i ng a nd c l a s s i f i c a t i o n techniques: Astronomical data dependent study, Prasenjit Banerjee, Tanuka Chattopadhyay and Asis K uma r C h a t t o p a d h y a y , N e w Astronomy, 2023, 100. 4. Clustering of eclipsing binary light curves through functional Principal Component Analysis, Soumita Modak, Tanuka Chattopadhyay and Asis Kumar Chattopadhyay , Astrophysics and Space Science, 367 (Article id 19),2022. 5. A new measure for assessment of clustering based on kernel density e s t i ma t i o n , S o um i t a Mo d a k , Communications in Statistics - Theory andMethods, 2022,Doi: https://doi.org/10.1080/03610926.2 022.2032168 6. A new nonparametric inter point d i s t a n c e b a s e d me a s u r e f o r assessment of clustering, Soumita Modak , Jou r na l o f S t a t i s t i ca l Computation and Simulation, 2022, 92, 1062-1077 Coordinator: Md. Mehedi Kalam ICARD Department of Physics, Aliah University, Kolkata: Activities from 01 April 2022 till 31 March 2023