Past Events

Abstract: Superfluid helium-4 at millikelvin temperatures is an ideal ac

Abstract: Duality connects seemingly different theories and their phases, and when a theory remains unchanged under duality, it is self-dual.

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Abstract: Space weather involves studying both the radiation from events like flares as well as the particles accelerated in the form of stellar energetic particle (SEP) events and coronal mass ejections (CMEs).

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Abstract: The guided transmission of optical waves is essential for modern applications in communication, information processing, and energy systems. Traditionally, light guiding in structures like optical fibers has been predominantly achieved through total internal reflection. In periodic structures, a range of other physical mechanisms can also facilitate optical wave transport.

Abstract: Empirical evidence for a gap between the computational powers of classical and quantum computers has been provided by experiments that sample the output distributions of two-dimensional quantum circuits. Many attempts to close this gap have utilized classical simulations based on tensor network techniques, and their limitations shed light on the improvements to quantum hardware required to frustrate classical simulability.

Abstract: The Emirates Mars Mission (EMM) began its science phase on May 23, 2021, and has been making major contributions to the exploration of Mars' atmosphere on a global scale. From its weather-satellite-like orbit with a period of 55 hours, the Hope Probe uses its infrared, visible, and ultraviolet remote sensing instruments to measure the characteristics of the atmosphere extending from the surface all the way to the edge of space.

Abstract: Biogenic emissions contribute significantly to the composition and chemistry of the troposphere, with vegetation being the main source of volatile alkenes. For example, isoprene is emitted by plants during photosynthesis and is one of the most abundant organic compounds released into the atmosphere: around 500 Tg of isoprene is emitted annually and forms the largest fraction of non-methane hydrocarbon emissions. The dominant mechanisms for the atmospheric removal of alkenes are reactions with the OH radical and ozone.

Abstract: The 1+1 dimensional gauge theories have served as useful models of quark confinement.

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Abstract: The Dark Energy Spectroscopic Instrument (DESI) collaboration is conducting a 5 year redshift survey of 40 million extra-galactic sources over 14,000 square degrees of the northern sky. One of its primary goals is to measure the cosmic expansion history with baryon acoustic oscillations (BAO). I will present the measurement of BAO in galaxy, quasar and Lyman-alpha forest tracers from the first year of observation.

Abstract:  Underpinning planetary science is a deep history of observation and, more recently, robotic exploration within the Solar System, from which models of planetary processes have been constructed. Concurrently, thousands of planets have been discovered outside our Solar System that exhibit enormous diversity, and their large numbers provide a statistical opportunity to place our Solar System within the broader context of planetary structure, atmospheres, architectures, formation, and evolution.

*Reception with cake in the h-bar following the talk

Abstract: Short-range-interacting particles can in principle crystallize via so-called non-classical pathways invoking a metastable liquid intermediate, yet non-equilibrium gelation often occurs before a metastable liquid can form. Using in situ X-ray scattering, we nevertheless watch electrostatically stabilized colloidal semiconducting nanocrystals self-assemble into long-range-ordered superlattices via this non-classical pathway and show how the pathway increases the rate of crystallization over that of direct crystallization from the colloidal phase.

Abstract:  I will review some aspects of our present understanding of many-body localization (MBL).  MBL is Anderson localization of interacting systems