Fourier transform spectroscopy of a spin-orbit coupled Bose gas

We describe a Fourier transform spectroscopy technique for directly measuring band structures, and apply it to a spin-1 spin-orbit coupled Bose-Einstein condensate. In our technique, we suddenly change the Hamiltonian of the system by adding a spin-orbit coupling interaction and measure populations in different spin states during the subsequent unitary evolution. We then reconstruct the spin and momentum resolved spectrum from the peak frequencies of the Fourier transformed populations. In addition, by periodically modulating the Hamiltonian, we tune the spin-orbit coupling strength and use our spectroscopy technique to probe the resulting dispersion relation. The frequency resolution of our method is limited only by the coherent evolution timescale of the Hamiltonian and can otherwise be applied to any system, for example, to measure the band structure of atoms in optical lattice potentials

A new theorem in particle physics enabled by machine discovery

AbstractA widespread objection to research on scientific discovery is that there has been a noticeable dearth of significant novel findings in domain sciences contributed by machine discovery programs. The implication is that the essential parts of the discovery process are not captured by these programs. The aim of this note is to document for the AI audience a novel finding in particle physics that was enabled by the machine discovery program PAULI reported previously. This finding consists of a theorem that expresses the minimum number of conservation laws that are needed, mathematically speaking, to account for any consistent experimental data on particle reactions. This note also reports how a puzzle raised by the theorem—its conflict with physics practice—is resolved

Data protection in public sector: normative analysis of portuguese and brazilian legal orders

Considering that information technology penetrates all areas and domains of the public sector, it has to be considered the extension of the required regulation needed for warranting that this phenomenon becomes an advantage and not a threat. In this sense, this study has as aims to discuss certain aspects associated with fair use of emerging and disruptive technologies and (such as Artificial Intelligence, Internet of Things, Big Data) in the public sector. The emphasis may fall upon the treatment of this subject by traditional regulatory instances, such as Data Protection Regulation-GDPR, in the sense of enhancing the capacity of Governments to ensure privacy, data protection, and the protection of citizens.This work has been supported by FCT Fundação para a Ciência e Tecnologia within the Project Scope: UID/CEC/00319/2019

Molecular phylogeny of the marine snail genus Haminoea (Gastropoda, Cephalaspidea): A framework to study marine diversity and speciation

Haminoea are herbivorous, coastal snails occurring in temperate and tropical waters of the Atlantic and Eastern Pacific oceans, with one species present in temperate South Africa (Indian Ocean). The genus is taxonomically difficult as several available nominal species were introduced based on shell descriptions alone, or described based on subtle differences in morpho-anatomical features, without a phylogenetic molecular framework. Fifteen species are currently accepted as valid in recent scientific literature and field guides (eight Eastern Atlantic, one temperate Indian Ocean, four Western Atlantic and three Eastern Pacific). Here we generate the first complete phylogeny (Bayesian and Maximum Likelihood) of this genus based on multilocus molecular data (COI, 12S rRNA, 16S rRNA, 28S rRNA) using a taxon set accumulated over a period of 15 years, coupled with species delimitation analyses methods (ABGD, ASAP, bPTP) and morpho-anatomical studies. The goal of this study is to provide insights into the taxonomy, phylogenetic relationships and geographical distributions of species while generating a framework for future systematic reviews of the genus, as well as to study speciation and historical biogeography. Our results rendered four possible hypotheses of species diversity: with 14, 15, 19 and 20 candidate species and point to the fact that several taxa presently regarded as valid might be conspecific (e.g. H. orteai–H. templadoi–H. exigua; and H. alfredensis–H. antillarum–H. orbignyana), while highlighting the existence of a complex of four or five species often identified as H. elegans. Pervasive nomenclatural problems in the genus, including with the type species H. hydatis, are highlighted and discussed.publishedVersio

Beyond the First Decade: A Forward-Looking History of LatCrit Theory, Community and Praxis

Part I of this Afterword sketches an overview of the jurisprudential and intellectual precursors that have influenced the emergence and development of LatCrit theory during this past decade. Part II turns squarely to the origins and the efforts of this enterprise, as we have endeavored to articulate the LatCrit subject position in socially relevant ways. Part III explains the special emphasis on internationalism manifest both in our symposia and more broadly in our portfolio of projects. Part IV then concludes with an outline of some key points that might help to inform our second-decade agenda. In presenting our account of this collective endeavor, we hope both to explain the vision that has guided our work thus far, as well as to welcome critical and self-critical rejoinders that might help present a more complete picture of this complex undertaking