Bootstrap certification of string order in quantum spin chains

Posted by klaurent Cornell

Kavli Affiliate: Debanjan Chowdhury | Summary:The many-body bootstrap certifies ground-state properties by minimizing energy over correlators constrained only by positivity, without any variational wavefunction. Its cost, however, grows exponentially with the size of the operators involved, placing the long-range string correlators that diagnose topological phases out of reach. We overcome this by treating string operators […]


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Supernova origin of galactic turbulence revealed by superbubbles

Posted by klaurent Peking, This Week: Astrophysics

Kavli Affiliate: Lile Wang |Summary:Supernovae (SNe) are among the leading candidates for powering galactic-scale turbulence. SNe drive expanding shells of neutral atomic hydrogen (HI) known as superbubbles. Due to the lack of a sensitive, dynamically complete, galaxy-wide census, superbubbles have not been used to quantify the galactic-scale turbulent energy budget. Here we present a combined […]


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High Resolution Grid-based Simulations of the Warm-Hot Intergalactic Medium

Posted by klaurent Peking, This Week: Astrophysics

Kavli Affiliate: Lile Wang |Summary:We present high-resolution cosmological hydrodynamic simulations of the Warm-Hot Intergalactic Medium (WHIM) using the GPU-optimized grid-based hydrodynamic code Kratos. Employing a uniform 4096^3 grid in a (100 h^-1 Mpc)^3 comoving volume, we achieve a spatial resolution of ~24.5 h^-1 kpc, sufficient to resolve the Jeans scale of gas at T ~ […]


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X-ray polarization of the Compton-thin Seyfert galaxy NGC 5506 with IXPE

Posted by klaurent MIT, This Week: Astrophysics

Kavli Affiliate: Herman Marshall | Summary:We report on the observation of the Compton-thin Seyfert galaxy NGC~5506 performed with the Imaging X-ray Polarimetry Explorer (IXPE). The observation, with a net observing time of 975~ks, was partly simultaneous with textitNuSTAR (52~ks) and textitXMM-Newton (37~ks). Using a simple baseline model with IXPE data only, we find an upper […]


Continue.. X-ray polarization of the Compton-thin Seyfert galaxy NGC 5506 with IXPE

Lens Modeling and Cosmological Inference from an Impure Sample of Galaxy-Galaxy Strong Lenses

Posted by klaurent Stanford, This Week: Astrophysics

Kavli Affiliate: Philip Marshall | Summary:The start of the Legacy Survey of Space and Time marks a new era for strong lensing science, where the number of strong lenses identified is expected to increase to $mathcalO(10^5)$. In this paper we use a neural network to determine the precision with which lens parameters can be determined, […]


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Strain-Induced Relaxor Multiferroicity at Room Temperature in Hexaferrite BaFe12O19 Thin Films

Posted by klaurent Cornell, This Week: Nanoscience

Kavli Affiliate: David Muller | Summary:Multiferroic materials that combine magnetic and electric order at room temperature are rare. Here, we demonstrate strain-induced room-temperature polar order in the ferrimagnetic hexaferrite BaFe12O19. First-principles calculations reveal a strain-tunable energy landscape with multiple competing dipolar configurations and predict that compressive strain favors polar distortions. Using an isostructural Sr1.03Ga10.81Mg0.58Zr0.58O19 substrate, […]


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Diagonalized Attention for Individualized Regression: Latent-Row Localization and Prediction

Posted by klaurent Peking, This Week: Astrophysics

Kavli Affiliate: Feng Long| Summary: Modern text and image representations are often matrix-valued, with rows corresponding to tokens, patches, or other local feature vectors. Predictive information is often sparse but sample-specific, making classical sparse regression methods with a common support poorly suited to this heterogeneity. This paper formalizes an individualized sparse regression framework for matrix-valued […]


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Polymer-free Assembly of Unencapsulated van der Waals Heterostructure Devices

Posted by klaurent Berkeley, This Week: Nanoscience

Kavli Affiliate: Felix Fischer | Summary:Van der Waals (vdW) heterostructures provide a versatile platform for exploring emergent quantum phenomena, yet their fabrication is often limited by interfacial contamination and incompatibility with surface-sensitive characterization. Here, we demonstrate muscovite mica as a polymer-free platform for assembling and patterning vdW heterostructure devices. Mica-mediated transfer enables clean exposed surfaces […]


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Flux Density Calibration of Radio Bursts Detected in the Sidelobes of the Canadian Hydrogen Intensity Mapping Experiment

Posted by klaurent MIT, This Week: Astrophysics

Kavli Affiliate: Kiyoshi Masui | Summary:The Canadian Hydrogen Intensity Mapping Experiment/Fast Radio Burst (CHIME/FRB) instrument is a transient astrophysical burst survey that is discovering FRBs, pulsars, and long-period transients. As a transit telescope, the survey is most sensitive within 2 degrees of the meridian; however, CHIME/FRB can detect bright astrophysical bursts out to its horizon, […]


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Cryo-EM Structures of Infectious Low-Twist α-Synuclein Filaments in Lewy Bodies

Posted by dbos This Week: Neuroscience, UCSF

Kavli Affiliate: Stanley Prusiner | Authors: Nicholas L. Yan, Mylan Mayer, Arthur A. Melo, Jacob I. Ayers, Daniel A. Mordes, William W. Seeley, Stanley B. Prusiner, Eric Tse, Vinita G. Chittoor-Vinod and Gregory E Merz | Summary: α-Synuclein (aSyn) aggregation within Lewy bodies underlies Parkinson’s disease and associated dementias. These aggregates are often comprised of […]


Continue.. Cryo-EM Structures of Infectious Low-Twist α-Synuclein Filaments in Lewy Bodies