36th Annual Report (2023-24)

176 Coordinator: Dr Ranjan Sharma ICARD- Department of Physics, Cooch Behar Panchanan Barma University (CBPBU), West Bengal (Activities from 01 April 2023 to 31 March 2024) AreasofResearch Workshops/schoolsorganised Primary areas: Astro-particle physics and Cosmology. Thrust areas: Studies of compact stars; gravitational collapse, dark matter and dark energy, tidal effects in extreme gravity, studies of higher-derivative and extended theories of gravity. through BAO scales; Kalita, S. & Rabha, C., The European Physical Journal C, 83 (7), 671 (2023) (27th July 2023 ). ICARD, CBPBU organised an international seminar, " Physics in curved spacetime ", in hybrid mode on 07 July 2023. The seminar was attended by more than 75 participants fromSpain, South Africa, Sri Lanka, and UAE, as well as research scholars, students, and faculty members from different provinces of India. Prof. Luis Herrera, Universidad de Salamanca, Spain; Dr Arunava Bhadra, High Energy and Cosmic Ray Research Centre, University of North Bengal; Dr Koushik Chakraborty, Government College of Education, Burdwan, West Bengal; Prof. Megandhren Govender , Durban University of Technology, Durban, South Africa participated in the seminar as invited speakers. Selected research scholars also presented their research articles. A workshop titled " Gravitation: Theory and Observation " was held at the IUCAA Centre for Astronomy Research and Development (ICARD), Department of Physics, Cooch Behar Panchanan Barma University (CBPBU) on 03 January 2024. Prof. Kanak Saha, IUCAA, Dr Arunava Bhadra, High Energy and Cosmic Ray Research Centre, University of North Bengal and Dr Tamal Sarkar, High Energy and Cosmic Ray Research Centre, University of North Bengal participated as resource persons at the workshop. The speakers discussed various aspects of current research initiatives in astrophysics and cosmology. The main thrust of the workshop was to provide hands-on training on SciLab in astronomy. The workshop was a huge success in terms of the active participation of more than eighty participants (post-graduate students, research scholars and faculty members) from nearby colleges and universities. The workshop was coordinated by Dr Ranjan Sharma, Coordinator, ICARD (CBPBU) andProf. Kanak Saha, IUCAA, Pune. 1. Core-envelope model of an anisotropic strange star with density-dependent Bag(B) parameter, B. Das, K. B. Goswami, P. K. Chattopadhyay, Ranjan Sharma, Indian J of Phys., 2023; https://doi.org/10.1007/s12648-023- 02586. 2. An insight on the origin of half- metallicity of new equi-atomic quaternary Heusler alloys PtRuTiZ (Z=Al/Si):GGA and GGA+U approaches, Kunal Labar, A. Shankar, M. Das and Ranjan Sharma, Computational Materials Science, 220 (2023) 112039. 3. Properties of relativistic star in 5-D Einstein-Gauss-Bonnet gravity, Soumik Bha t t a cha r y a , Sun t ha r a l i ngam Thirukkanesh and Ranjan Sharma, Mod. Phys. Lett. A 38 (2023) 2350018. 4. Stiffness, complexity, cracking and stability of relativistic compact stars, Ranjan Sharma and Satarupa Barman, Acta Phys. PolonSupp 16 (2023), 6,7. 5. A physically viable model for a compact star and its compactness bound, S. Thirukkanesh, Arpita Ghosh and Ranjan Sharma, Eur. Phys. J. Plus, (2023) 138:588 6. Critical compactness bound of a class of compact stars, Satarupa Barman and PublicationsusingICARDfacilities Ranjan Sharma, Gen. Relativ. Grav. (2023)55:99. 7. Electromagnetic extension of Buchdahl bound in f(R,T) gravity; Soumik Bhattacharya, Ranjan Sharma and Sunil D . M a h a r a j , E u r . P h y s . J C (2024)84(1),64. 8. Impact of spacetime curvature on the physical behaviour of Vaidya and Tikekar (VT) type anisotropic compact objects, Lipi Baskey, Shyam Das, Ranjan Sharma and Farook Rahaman, New Astronomy (2024); 108, 102164. 9. Compactness bound of Buchdahl- Vaidya-Tikekar anisotropic star in D ≥ 4- dimensional spacetime, Samstuti Chanda and Ranjan Sharma, Gen. Relativ. Grav. (2024) 56:41. 10. A. Hakim, K. B. Goswami and P. K. Chattopadhyay, Strange Quark Mass (m_s) dependent model of anisotropic Strange Quark Star, Chin. Phys. C (2023) 47(9), 095103. 11. D . B h a t t a c h a r j e e a n d P . K . Chattopadhyay, Stable charged gravastar model in cylindrically symmetric space-time, Physica Scripta (2023) 98, 085013. 12. A. Saha, K. B. Goswami, R. Roy and P. K. Chattopadhyay, Maximum mass of charged strange quark star in presence of Strange Quark Mass (m_s), Physica Scripta (2023) 98, 105012. 13. K. B. Goswami, A. Saha, P. K. Chattopadhyay and S. Karmakar, New mass limit of a strange star admitting a colour flavour locked equation of state, Eur. Phys. J. C (2023). 83, 1038 (2023). 14. B. Das, K. B. Goswami, A. Saha and P. K. Chattopadhyay, Anisotropic strange stars and its maximum mass in Finch-