IISER Pune Digital Repository

A repository of scholarly research output from the Indian Institute of Science Education and Research (IISER) Pune.

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    Boosting the piezoresponse in ferroelectric polymer via perovskite nanorod incorporation
    (2026-09) Patra, Snigdha; Borgohain, Karabi Kanchan; DAS, UJJAL; Dehingia, Anurag; Roy, Asim; Dept. of Physics
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    State of Charge Estimation Using Hyperbolic Sine Based Discrete Time Sliding Mode Observer
    (IEEE, 2026-07) Singh, Vishwa Pal; LAMBE, AMRUTA; Chakrabarty, Sohom; Dept. of Data Science
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    Positivity in massive spin-3/2 EFTs and the Planck-suppressed neighbourhood of supergravity
    (Springer Nature, 2026-09) DESAI, JAY; GHOSH, DIPTIMOY; Pant, Saurabh; Dept. of Physics
    It is well known that a strictly massless spin-3/2 particle can interact consistently only within supergravity. Recently, positivity arguments have shown that an effective field theory of a massive Majorana spin-3/2 particle admits an arbitrarily small mass only if a graviton is present and the four-fermion contact interactions are tuned to the values dictated by = 1 supergravity. In this work, we investigate how this limit is approached at finite mass. Assuming that the graviton t-channel pole can be discarded, we derive non-forward, tree-level dispersive bounds on massive spin-3/2 contact operators and determine the region of effective couplings consistent with unitarity and analyticity. For sufficiently small m, we find that the allowed parameter space forms a bounded, Planck-suppressed neighbourhood of the supergravity point, defined by the supergravity values of the four-fermion couplings. The supergravity point lies on the boundary of this region. In the regime m ≪ MPl, the volume of the allowed region scales parametrically as and shrinks to zero as m → 0, smoothly reproducing the massless-limit results. The allowed region becomes unbounded when mass approaches the Planck scale. We further analyze the effect of including additional light scalar and pseudo-scalar degrees of freedom, motivated by the Polonyi model, and find that their couplings are also bounded in a way similar to the contact couplings and that it doesn’t enlarge the allowed contact coupling space.
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    First COI barcode record and phylogenetic assessment of Pramadea lunalis (Guenée, 1854) from Kerala, Western Ghats, India
    (Applied and Natural Science Foundation, 2026-09) M. K., Praveen Kumar; Jacob, Sapna; Mini, P.V.; Vijesh, A.M; UNNIKRISHNAN, M.P.; Dept. of Biology
    DNA barcode data remain limited for many Indian Spilomelinae, making reliable species identification and regional comparisons difficult. Pramadea lunalis (Guenée, 1854), originally described from India, is often reported as Syllepte lunalis in older literature and public databases. This study generated and evaluated COI barcode data for P. lunalis from Kerala, India, in the Western Ghats. Two male specimens were identified using external morphology and examination of the male genitalia, with reference to published taxonomic descriptions. Genomic DNA was extracted from ethanol-preserved leg tissue. The mitochondrial cytochrome c oxidase subunit I (COI) region was amplified using the Folmer primers LCO1490 and HCO2198. The sequences were analyzed using BLASTn, pairwise genetic distances, and Neighbor-Joining (NJ) and Maximum Likelihood (ML) methods. The two Kerala sequences were deposited in GenBank under accession numbers PX071900 and PZ343591. Both showed 95.7% identity with available Southeast Asian S. lunalis sequences, with a genetic divergence of approximately 4.3–4.5%. The Kerala specimens formed a strongly supported clade in both NJ and ML analyses and were recovered as the sister group of the Southeast Asian S. lunalis sequences. The observed divergence may reflect geographic differentiation or lineage-level variation, although inconsistencies in database nomenclature may also influence sequence comparisons. This study provides the first COI barcode records of P. lunalis from India and expands the available molecular reference data for the species. Broader geographic sampling, detailed morphological comparisons, and additional nuclear markers are needed to clarify the taxonomic significance of the observed divergence.
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    Morphological and Star Formation Properties of Cosmic Noon Massive Quiescent Galaxies
    (IOP Publishing, 2026-10) PRASAL, VAIDIK; Wadadekar, Yogesh; Biswas, Pralay; Jain, Rashi; Dept. of Physics
    We analyze the star formation and morphological properties of massive quiescent galaxies at cosmic noon (2 < z < 3) in the A2744 field, using deep JWST/NIRCam broadband and medium-band imaging from the UNCOVER Treasury program and the MegaScience survey, complemented by archival Hubble Space Telescope data. Using BAGPIPES spectral energy distribution (SED) modeling, we select 14 unique massive quiescent galaxies (M* ≳ 1010 M⊙; specific star formation rate (sSFR) < 0.2/tage). Morphological analysis with statmorph and pysersic reveals that most galaxies are intermediate type or S0s with a median Sérsic index n ∼ 4, consistent with bulge-dominated systems. This value remains constant over z ∼ 1.5–4, indicating that the morphology of massive galaxies is linked to their quiescence since at least z ∼ 4. Spatially resolved SED modeling with piXedfit shows that 11 out of 14 galaxies exhibit positive radial sSFR gradients, providing direct evidence for inside-out quenching, with the mean sSFR increasing by ∼2 dex from R/Re = 0.5–4.5. Formation time (t50) profiles confirm that inner regions formed ≈0.5 Gyr earlier, on average, than the outer regions, and quenching timescale profiles show that the cores were quenched more rapidly than the outskirts. Most galaxies are compact, with a mean half-mass radius of Re = 1.95 ± 0.13 kpc. The observed inside-out quenching pattern is consistent with quenching driven by active galactic nucleus feedback, while the bulge-dominated morphologies suggest morphological quenching may also contribute.