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        <h1>Physics Department Talks</h1>
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		{ title: "One day symposium on Twistronics and Moire's patterns in van del Waals heterostructures organized under INDIA-ISRAEL SPARC PROJECT, supported by Ministry of Education, Govt. of India", date: "2025-03-3", time: "One day", venue: "Senate Room, (Main buidling, 1st floor)", speaker: "Mandar M. Deshmukh (TIFR, Mumbai), Priya Mahadevan (SNBNCBS, Kolkata), Manish Jain (IISc, Bangalore), Aveek Bid (IISc, Bangalore), Anindya Das (IISc, Bangalore), Shahal Ilani  (Weizmann Institute of Science, Israel), Nadav Auerbach  (Weizmann Institute of Science, Israel), Disha Arora (IIT Delhi), Deepanshu Aggarwal (IIT Delhi)", abstract: " The objective of symposium is to bring together researchers to discuss recent advances in field of twistronics. This symposium is in the memory of late Prof. Assa Auerbach (Technion, Israel Institute of Technology, Haifa), who was associated with the SPARC project from Israel.", pdf: "abstract1.pdf" },

		{ title: "Quantum Computing and its Applications to Atoms and Molecules", date: "2025-03-3", time: "3 PM", venue: "LH-316", speaker: "Prof. Bhanu Pratap Das, Centre for Quantum Engineering, Research and Education (TCG CREST), Kolkata and Department of Physics, Tokyo Institute of Technology (currently Institute of Science Tokyo), Japan", abstract: " Quantum computing is currently one of the most important areas  of science and technology. Research in this field is being performed in universities, research institutes and companies in many countries in the world. In India, the National Quantum Mission will soon get underway. Quantum computing has the potential to create an unprecedented revolution in science and technology as it could have a very strong impact in many areas of science and society. It is based on the power and uniqueness of quantum mechanics. This talk will focus on the basics of this field and the current status of its applications to properties of atoms and molecules using digital quantum computers and quantum annealers.", pdf: "abstract1.pdf" },

		{ title: "Using Gravitational Waves to see the Early Universe", date: "2025-02-17", time: "5 PM", venue: "MS420", speaker: "Dr. Rishav Roshan from the University of Southampton, UK", abstract: " Gravitational waves are a unique probe of the early Universe, as the Universe is transparent to gravitational radiation right back to the beginning. Here, I will summarise some of the different scopes of primordial events that could lead to a detectable stochastic gravitational wave background. Any such background would shed light on what (if anything) lies beyond the Standard Model, sometimes at remarkably high scales. I will also briefly overview the physics behind stochastic gravitational wave background before delving deep into some of the major primordial events that can source such a background.", pdf: "abstract1.pdf" },


		 { title: "There is plenty of room for room temperature superconductivity in quantum spin Liquid", date: "2025-02-11", time: "5 PM", venue: "MS420", speaker: "Prof. G. Baskaran, IIT Madras, IMSC Chennai and Perimeter Institute, Canada", abstract: " Bednorz-Muller's discovery of high  superconductivity in cuprates, initiated RVB theory, where high  superconductivity emerges in a doped Mott insulator, in the background of a quantum spin liquid. I will present theoretical arguments, for the possibility of ambient superconductivity, via RVB mechanism, within limits of solid-state/quantum-chemical constraints. A variety of materials exhibiting superconductivity at ambient conditions are continuing to be reported experimentally. However, superconductivity seems unstable, elusive and statistical. RVB theory guided materials search and synthesis, to find stable superconductivity at room temperatures and ambient conditions, will be outlined.", pdf: "abstract1.pdf" },

		 { title: "Optical atomic clocks: prospects for a redefinition of the SI second", date: "2025-02-19", time: "3:30 PM", venue: "MS420", speaker: "Prof. Brajesh K Mani, IIT Delhi", abstract: " Atomic clocks are one of the most accurate time measurement devices in existence till today. Due to their unprecedented  accuracy, they are used in a plethora of fundamental and practical applications such as navigation systems, quantum computer, telecommunications and military devices, probing variations in the fundamental constants, etc.  As another key application, the current SI unit of time is based on the atomic clocks. One second is defined as the time it takes for 9,192,631,770 cycles of radiation to occur between two hyperfine levels of the cesium-133 atom. However, after the demonstration of femtosecond frequency comb in 2000,  clocks based on optical transitions in ions or neutral atoms have been developed with accuracies two orders of magnitude higher than that of the Cs standards. The immense progress on optical atomic clocks across the globe in the last two decades envisions a possible redefinition of the SI second by 2030. In this colloquium, I shall provide a brief introduction to the optical clocks in consideration in India and abroad and shall discuss the possible candidates for redefining the second. I shall also share some of the works we do in this direction in our group at IIT Delhi.", pdf: "abstract1.pdf" },

		  { title: "QCD-Gravity double-copy in the Regge regime via shockwave collisions", date: "2025-02-12", time: "3:30 PM", venue: "MS420", speaker: "Dr. Himanshu Raj, Stony Brook University", abstract: " We present new results for gravitational wave radiation in ultrarelativistic collisions of black holes which are described as Aichelburg-Sexl shockwaves. We demonstrate that the effective Lipatov vertex governing graviton radiation is a mathematical double copy of the corresponding effective gluon emission vertex in heavy-ion collisions [1,2]. We also show that propagators in the gravitational shockwave background are double copies of the corresponding propagators in the gluon shockwave background [3]. We present the gravitational BFKL equation and comment upon its solution and similarities to the QCD case [4]. The existence of these double-copy relations suggest that CGC-based techniques that describe the energy evolution of gluon radiation in QCD can similarly be applied to study the gravitational wave radiation spectrum in the context of trans-Planckian scattering.", pdf: "pdfs/IITD.pdf" },

            { title: "Reconciling cosmological tensions with inelastic dark matter and dark radiation.", date: "2025-01-29", time: "3:30 PM", venue: "MS420", speaker: "Dr. Satyabrata Mahapatra, Sungkyunkwan University in South Korea", abstract: " In this talk  I will introduce a novel particle physics framework addressing multiple cosmological tensions, including discrepancies in the Hubble parameter, S8, and Lyman-\alpha forest data. This model, SIDR+z_t (Self-Interacting Dark Radiation with transition redshift), features an inelastic dark matter (IDM) scenario coupled with dark radiation under a dark gauge symmetry. The model incorporates cold dark matter, strongly interacting dark radiation, and their interactions, suppressing free-streaming effects and attenuating the matter power spectrum at small scales. The inelastic nature of dark matter introduces a distinct temperature-dependent interaction rate, crucial for resolving Lyman-\alpha discrepancies. Solving the relevant Boltzmann equations, we explore the model's consistency with Big Bang Nucleosynthesis and its ability to produce additional contributions prior to recombination while achieving the correct dark matter relic density. ", pdf: "https://drive.google.com/file/d/1AeoDabEzuDf59xElBg2JJz1C1dMkz2qL/view?pli=1" },
 
            
            
			{ title: "A First-Principles Approach for Predicting the Catalytic Properties of Multimetallic Surfaces", date: "2025-01-28", time: "4:30 PM", venue: "MS420", speaker: "Dr. Shikha Saini, MIT", abstract: "Multimetallic alloys (MMAs) have sparked tremendous interest in engineering low-cost materials with high activity and selectivity in heterogeneous catalysis. Multimetallic systems provide complementary functionalities and an unprecedented tunability when designing catalyst formulations. However, due to their immense structural and compositional complexity, the investigation and identification of an optimal catalyst is a tedious and time-consuming process, both experimentally and theoretically. Recent developments in predicting potential MMAs rely on machine learning models, which require a significantly large training dataset to design the framework for MMAs. Therefore, theoretical design principles are highly desirable to accelerate the screening of catalyst structures across the vast compositional space.  In this talk, I will present a simple and general model for predicting the site stability of multi metallic surfaces and nanoparticles, based on physical principles. The model requires only a small set of density functional theory (DFT) calculations of metal atom binding energies of monometallic and dilute alloy surface slabs to optimize the parameters in the simple model. These parameters depend solely on the identity of the metal site and its local coordination environment. The resulting model allows for the quantification of the stability of any particular atom site in any conceivable chemical environment across a wide range of morphologies, sizes, and arrangements by interpolating the derived parameters from a monometallic system to a completely diluted alloyedsystem. This approach is highly efficient and easily transferable to other and more complex multi metallic systems regardless of the percentage of the constituting elements. Hence, the proposed theoretical framework provides a robust approach to discovering new alloy catalysts through rapid screening at the atomistic level", pdf: "https://owncloud.iitd.ac.in/nextcloud/index.php/s/y3BN5YtXodkRMQf" },
            
			{ title: "Feynman diagrams live in conformal families", date: "2025-01-27", time: "4 PM", venue: "MS420", speaker: "Mr. Siddharth Prabhu, TIFR, Mumbai", abstract: " Feynman diagrams, and the associated Feynman integrals are of central importance in connecting the theory of elementary particles with experiments, such as those performed in colliders. On the other hand, conformal integrals routinely make an appearance in the computation of conformal correlators, conformal blocks, and other conformally covariant objects. We show that every Feynman diagram with massless internal fields is a limit of a conformal integral. This leads to a classification of Feynman diagrams into conformal families, labelled by the head of the family, a conformal integral. Computing the conformal integral in each family suffices to compute all the Feynman diagrams in the family exactly. Using known exact results for some conformal integrals, we present the solutions to the other Feynman diagrams in the corresponding families. These are answers to either finite or dimensionally regularized Feynman diagrams to all orders in the regularization parameter.", pdf: "abstract3.pdf" }
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