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Evading no-go for PBH formation and production of SIGWs using Multiple Sharp Transitions in EFT of single field inflation
Evading no-go for PBH formation and production of SIGWs using Multiple Sharp Transitions in EFT of single field inflation
Center for Cosmology and Science Popularization
Center for Cosmology and Science Popularization
Guide: Dr. Sayantan Choudhury
Deploying multiple sharp transitions (MSTs) under a unified framework, we investigate the formation of Primordial Black Holes (PBHs) and the production of Scalar Induced Gravitational Waves (SIGWs) by incorporating one-loop corrected renormalized-resummed scalar power spectrum. With the effective sound speed parameter, 1 ⩽ cs ⩽ 1.17, the direct consequence is the generation of PBH masses spanning MPBH, thus evading the well-known No-go theorem on PBH mass. Our results align coherently with the extensive NANOGrav 15-year data and the sensitivities outlined by other terrestrial and space-based experiments (e.g.: LISA, HLVK, BBO, HLV(O3), etc.).
Two-stream Plasma Instability as a Potential Mechanism for Particle Escape from the Venusian Ionosphere
Two-stream Plasma Instability as a Potential Mechanism for Particle Escape from the Venusian Ionosphere
Institute of Natural Sciences and Applied Technology, Kolkata
Guide: Dr. Swarniv Chandra
In this work, we try to design a theoretical model for the Venus atmosphere where the two-stream instability leads to momentum transfer and amounts to the subsequent escape of Hydrogen and Oxygen ions from the ionosphere. We employ the quantum hydrodynamic model and obtain the linear dispersion relation for which the two-stream is studied. Further, the interaction of solar wind with the Venus atmosphere has been studied with the data from ASPERA-4 of Venus Express (VEX). The data supports the fact that two-stream instability provides sufficient energy to accelerate ions to get rid of Venus's gravity for the sake of that ions can leave the atmosphere of Venus.
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