• Apr

    Title: The Enigma of black hole horizons

    Abstract: By now, gravitational wave observations have established that black holes are ubiquitous in our universe. But what exactly is a black hole? What exactly is it that forms as a result of a gravitational collapse and evaporates due to quantum radiation? The common answer is of course ‘horizons’. But the notion of horizons is rather enigmatic. For example, an event horizon may be forming and growing in your room in anticipation of a gravitational collapse that may take place a billion years from now! However there are alternative notions that can be used in an effective manner both in the analysis of black hole mergers in classical general relativity as well as the quantum process of black hole evaporation. This account of vexing and fascinating properties of black hole horizons will be presented at a level that should be accessible to non-experts.

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  • The Physics DDIAP Committee is pleased to present a Raga Music Event featuring Grammy Award-winner (flute) Steven Gorn, Nitin Mitta (tabla) and Srinivas Reddy (sitar) on April 3 from 7:30 - 9:30 PM in the ERC lobby.
    Mark your calendars for this spectacular event now!
    More information on the performers:
    Steve Gorn (flute) https://stevegorn.com/
    Nitin Mitta (tabla) https://nitinmitta.com/bio/
    Srinivas Reddy (sitar) https://sankalpana.org/about/
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  • Apr

    Condensed Matter Seminar: Elena Glen, EeroQ

    Barus and Holley, Rm 190
    Title: “Single-shot readout of the neutral divacancy in silicon carbide for quantum networks.”
    Spin-deects in crystal lattices are promising candidates for quantum communication and sensing due to their optical addressability and long spin coherence times. Defect spins in silicon carbide (SiC) boast these properties, with the added advantage of being hosted in a scalable and fabrication-amenable semiconducting platform. Despite these advantages, an outstanding hurdle for SiC-based quantum systems is single-shot readout, a deterministic measurement of the quantum state. In this talk, I will discuss how single-shot readout of single neutral divacancies in SiC was ultimately achieved via spin-to-charge conversion, whereby the defect’s spin state is mapped onto a long-lived charge state. Using this technique, we report over 80% readout fidelity without pre- or post-selection, resulting in a high signal-to-noise ratio that enables us to measure long spin coherence times. Combined with pulsed dynamical decoupling sequences in an isotopically purified host material, we measure single-spin T2 > 5 seconds, over two orders of magnitude greater than previously reported in this system. The mapping of these coherent spin states onto single charges unlocks both single-shot readout for scalable quantum nodes and opportunities for electrical readout via integration with semiconductor devices.
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  • Apr

    Brown Theoretical Physics Center (BTPC) Seminar Featuring Jeff Oishi: Lecture 4

    Barus and Holley, Rm 2nd-floor Seminar Room

    Please join us for the BTPC Seminar on Friday, 4/7 at 2 PM at the Barus Building, 340 Brook Street in the 2nd-floor Seminar Room for lecture four in a five-part lecture series.

    Title: Computing Fluid Flows Lecture 3: An Overview of Fluid Mechanics, Spectral Methods, and the Dedalus Framework

    Abstract: “Computing Fluid Flows” is a series of lectures aimed at treating fluid
    mechanics from a physicist’s perspective, with the goal of learning how to compute solutions to complex problems ranging from climate to clean energy to biological fluids. Central to our understanding of fluids are numerical solutions to linear and non-linear model equations. Starting from a solid foundation in the numerical analysis of partial differential equations (PDEs), I will discuss how to build models in order to increase understanding of complicated fluid systems using the Dedalus project, an open-source framework for PDEs.

    In this series of lectures, I will introduce fluid mechanics with an emphasis on the mathematical and physical details that make it such a challenging field in which
    to compute solutions. Starting from the Navier-Stokes equations, I will discuss aspects of PDEs and give a brief overview of some of the major classes of numerical techniques to solve them. From there, I will focus on one particular family of numerical methods, the spectral methods. I will discuss why they are an enduring choice, particularly among physicists interested in theoretical studies, and illustrate the directions in which spectral techniques continue to be developed. Finally, I will introduce the Dedalus framework, a tool for solving PDEs using spectral methods, which I will use throughout the lecture series.

    If you would like to install Dedalus before the lectures, please do so by following the instructions here:
    A set of example scripts will be posted at
    in advance of the first lecture.
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  • Apr

    Title and Abstract: TBD

    More Information 
  • Apr

    Physics Colloquium featuring Cliff Cheung, Caltech

    Barus and Holley, Rm 168

    Title and abstract: TBD

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  • Apr

    Condensed Matter Seminar: Qi Wen, WPI

    Barus and Holley, Rm 168

    Title and Abstract: TBD

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    Through a collaboration with TAPS, the Brown Physics Department’s DDIAP Committee presents their second Artist-in-Residence series with SYREN Modern Dance performing Red and Blue, Bitter and Sweet, an exploration of quantum mechanics theories including entanglement, wave/particle duality, uncertainty principle and superposition.

    SYREN Modern Dance, is a New York City-based modern dance company whose artists have been named United States Cultural Ambassadors by the Department of State. Now celebrating its 20th year of sharing dance, SYREN exists to embrace dance as a conduit of connection, communication, curiosity, and collaboration.

    The company aims to shed light on complex scientific principles through the lens of dance and human connection. The way particles function at the microscopic level is vastly different than how we see and experience the world on a daily basis. The disparity between both realities is a key point of departure for the work. Life itself is experienced through particles interacting within us and within each other - it is a dance, indeed.


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