Department of History

Ashoka University is a private university located in Sonipat, Haryana, India, focusing on liberal arts and sciences. It was established in 2014.&nbsp;It is guided by an academic council of academics and scholars from around the world. The council sets the university&#39;s academic standard, advising on matters of curriculum, faculty hiring and research.&nbsp;

Ashoka University offers a full-time 3 (+ 1) year undergraduate programme. The University comprises of&nbsp;2500 plus students, with a mix of both national and international students.&nbsp; &nbsp;

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Ashoka University

We have investigated the rich dynamics of complex wave packets composed of multiple high-lying Rydberg states in He. A quantitative agreement is found between theory and time-resolved photoelectron spectroscopy experiments. We show that the intricate time dependence of such wave packets can be used for investigating quantum defects and performing artifact-free timekeeping. The latter relies on the unique fingerprint that is created by the time-dependent photoionization of these complex wave packets. These fingerprints determine how much time has passed since the wave packet was formed and provide an assurance that the measured time is correct. Unlike any other clock, this quantum watch does not utilize a counter and is fully quantum mechanical in its nature. The quantum watch has the potential to become an invaluable tool in pump-probe spectroscopy due to its simplicity, assurance of accuracy, and ability to provide an absolute timestamp, i.e., there is no need to find time zero.

Department of Physics

Fulltext

Physical review research

Quantum watch and its intrinsic proof of accuracy

Let&nbsp;&lambda;j&nbsp;and&nbsp;ajj,&nbsp;1&le;j&le;n, be the eigenvalues and the diagonal entries of a <a href="https://www.sciencedirect.com/topics/mathematics/hermitian-matrix">Hermitian matrix</a> A, both enumerated in the increasing order. We prove some inequalities that are stronger than the Schur majorisation inequalities&nbsp;&sum;j=1r&lambda;j&le;&sum;j=1rajj,&nbsp;1&le;r&le;n.

Department of Mathematics

World University root node

Linear Algebra and Its Applications

Extensions of the Schur majorisation inequalities

We present the results of timing and spectral analysis of the high-mass X-ray binary pulsar, Cen X-3, with the help of observations carried out using the Large Area X-ray Proportional Counter onboard AstroSat. As part of our analysis, we sampled the source properties during four different observation epochs covering two widely different intensity states. We obtain a timing solution and report precise measurements of the spin and orbital parameters corresponding to these observational epochs. The pulse profiles during the two intensity states reveal dramatically varying shapes within a time span of 1 month. We report the detection of one of the lowest measured frequencies of quasi-periodic oscillations at 0.026&nbsp;±&nbsp;0.001&nbsp;Hz for Cen X-3 during its low-intensity state. We also find correlated periodic and aperiodic noise components in the power density spectra. We further carried out a phase-averaged and a pulse phase-resolved spectral study, where we find that the best-fitting continuum spectrum is well described by an absorbed Comptonization model along with a blackbody. Cen X-3 exhibited the presence of the ∼28&nbsp;keV cyclotron resonant scattering feature absorption line and a ∼6.6&nbsp;keV Fe emission line in both the intensity states. Significant variations in the line-forming regions and mode of accretion for Cen X-3 within time spans of a month make Cen X-3 a highly dynamic persistent binary.

Monthly Notices of the Royal Astronomical Society

Timing and spectral studies of Cen X-3 in multiple luminosity states using AstroSat

Dipolar coupled multi-spin systems have the potential to be used as molecular qubits. Herein we report the synthesis of a molecular multi-qubit model system with three individually addressable, weakly interacting, spin urn:x-wiley:14337851:media:anie202207947:anie202207947-math-0001 centres of differing g-values. We use pulsed Electron Paramagnetic Resonance (EPR) techniques to characterise and separately address the individual electron spin qubits; CuII, Cr7Ni ring and a nitroxide, to determine the strength of the inter-qubit dipolar interaction. Orientation selective Relaxation-Induced Dipolar Modulation Enhancement (os-RIDME) detecting across the CuII spectrum revealed a strongly correlated CuII-Cr7Ni ring relationship; detecting on the nitroxide resonance measured both the nitroxide and CuII or nitroxide and Cr7Ni ring correlations, with switchability of the interaction based on differing relaxation dynamics, indicating a handle for implementing EPR-based quantum information processing (QIP) algorithms.

Department of Chemistry

Angewandte Chemie - International Edition

Modelling Conformational Flexibility in a Spectrally Addressable Molecular Multi-Qubit Model System

Recent experiments show that adaptive Darwinian evolution in one environment can lead to the emergence of multiple new traits that provide no immediate benefit in this environment. Such latent non-adaptive traits, however, can become adaptive in future environments. We do not know whether mutation or environment-driven selection is more important for the emergence of such traits. To find out, we evolve multiple wild-type and mutator E. coli populations under two mutation rates in simple (single antibiotic) environments and in complex (multi-antibiotic) environments. We then assay the viability of evolved populations in dozens of new environments and show that all populations become viable in multiple new environments different from those they had evolved in. The number of these new environments increases with environmental complexity but not with the mutation rate. Genome sequencing demonstrates the reason: Different environments affect pleiotropic mutations differently. Our experiments show that the selection pressure provided by an environment can be more important for the evolution of novel traits than the mutational supply experienced by a wild-type and a mutator strain of E. coli.

Other Publications

Nature Communications

Environmental complexity is more important than mutation in driving the evolution of latent novel traits in E. coli

Uneasy Translations: Self, Experience and Indian Literature interweaves the personal journey of an academic into reflections around self, language and translation with an eye on the intangibly available category of experience. It dwells on quieter modes of being political, of making knowledge democratic and of seeing gendered language in the everyday. In an unusual combination of real-life incidents and textual examples, it provides a palimpsest of what it is to be in a classroom; in the domestic sphere, straddling the 'manyness' of language and, of course, in a constant mode of translation that remains incomplete and unconcluded. Through both a poignant voice and rigorous questions, Kothari asks what it is to live and teach in India as a woman, a multilingual researcher and as both a subject and a rebel of the discipline of English. ­She draws from multiple bhasha texts with an uncompromising eye on their autonomy and intellectual tradition. ­The essays range from questions of knowledge, affect, caste, shame and humiliation to other cultural memories. Translation avoids the arrogance of the original; it has the freedom to say it and not be held accountable, which can make it both risky and exciting. More importantly, it also speaks after (anuvaad) rather than only for or instead, and this ethic informs the way Kothari writes this book, breaking new ground with gentle provocations.

Department of English

Bloomsbury India

Uneasy Translations : Self, Experience and Indian Literature

Department of International Relations

European Review of Latin American and Caribbean Studies

Lula and his politics of cunning: From metalworker to president of Brazil, John D. French. University of North Carolina Press, 2020

Morphology has been a leading taxonomic guiding light to systematists for the last couple of hundred years. However, the genetic and – more recently – genomic revolution have produced numerous demonstrations of erroneous classifications that were based on labile morphological traits. We used thousands of genome-wide markers to shed light on evolutionary dynamics in a confusing and taxonomically obscure group of Asian Cyornis flycatchers. Using genomic data, we corroborated recent findings based on three mitochrondrial and five nuclear genes that the two taxa hainanus and klossi which were previously treated as separate species (Cyornis hainanus and Cyornis rubeculoides klossi, respectively) are genomically homogeneous and form a single species, C.&nbsp;hainanus. We also uncovered a novel case of interbreeding between C.&nbsp;hainanus and a non-sister species, C.&nbsp;glaucicomans, illustrating these flycatchers' ability to hybridise in marginal situations even after substantial times of divergence. Our study illustrates how genome-wide loci can shed light on complicated taxonomic problems, resulting in a better integration of phenotypic and genotypic data.

Department of Biology

Zoologica Scripta

Genome-wide SNPs confirm plumage polymorphism and hybridisation within a Cyornis flycatcher species complex

Let f be a transformation on the Euclidean space such that f(0) = 0, and f preserves distances. Then f is linear, and this makes it easier to analyze f. The Mazur—Ulam theorem generalizes this to maps between real normed linear spaces. We discuss this theorem and its proofs.

Resonance

Isometries and Linearity

Recent mechanistic models argue for a key role of rhythm processing in both speech production and speech perception. Patients with the non-fluent variant (NFV) of primary progressive aphasia (PPA) with apraxia of speech (AOS) represent a specific study population in which this link can be examined. Previously, we observed impaired rhythm processing in NFV with AOS. We hypothesized that a shared neurocomputational mechanism structures auditory input (sound and speech) and output (speech production) in time, a “temporal scaffolding” mechanism. Since considerable white matter damage is observed in NFV, we test here whether white matter changes are related to impaired rhythm processing. Forty-seven participants performed a psychoacoustic test battery: 12 patients with NFV and AOS, 11 patients with the semantic variant of PPA, and 24 cognitively intact age- and education-matched controls. Deformation-based morphometry was used to test whether white matter volume correlated to rhythmic abilities. In 34 participants, we also obtained tract-based metrics of the left Aslant tract, which is typically damaged in patients with NFV. Nine out of 12 patients with NFV displayed impaired rhythmic processing. Left frontal white matter atrophy adjacent to the supplementary motor area (SMA) correlated with poorer rhythmic abilities. The structural integrity of the left Aslant tract also correlated with rhythmic abilities. A colocalized and perhaps shared white matter substrate adjacent to the SMA is associated with impaired rhythmic processing and motor speech impairment. Our results support the existence of a temporal scaffolding mechanism structuring perceptual input and speech output.