Metal Saturation and the Redistribution of Hydrogen in Earth’s Mantle

Posted by klaurent Caltech

Kavli Affiliate: Paul D. Asimow | Summary:Iron disproportionation reactions in mantle silicates can produce metallic iron that drives Earth’s deep mantle toward metal saturation under reduced conditions. Subducting slabs transport hydrated silicates to these depths, where interactions with metallic iron can reduce structurally bound hydrogen in silicates to reduced hydrogen-bearing phases, such as molecular hydrogen […]


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Opposing effects of slow and fast theta synchrony on working memory in the human hippocampal-orbitofrontal network

Posted by dbos UCSF

Kavli Affiliate: Edward Chang | Authors: Samantha M Gray, Adam JO Dede, Zachariah R Cross, Ignacio Saez, Fady Girgis, Edward F Chang, Kurtis Auguste, Ammar Shaikhouni, Robert T Knight and Elizabeth L Johnson | Summary: Working memory (WM) enables us to maintain and manipulate information over time, but how the brain organizes sequential information locally […]


Continue.. Opposing effects of slow and fast theta synchrony on working memory in the human hippocampal-orbitofrontal network

The Quadruply Lensed Supernova SN 2025wny: Implications for LSST

Posted by klaurent MIT

Kavli Affiliate: Paul Schechter | Summary:Lensed supernovae (SNae) are among the most eagerly anticipated transients expected from the Legacy Survey of Space and Time (LSST). Quadruply lensed SNae permit more highly constrained models than "mere" doubles. The quadruply lensed SN 2025wny offers multiple lessons on how one might respond to an alert. The full benefits […]


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The $R$-Process Alliance: The $R$-Process Enhancement of Stars from Chemodynamically Tagged Groups in the Milky Way Halo

Posted by klaurent MIT

Kavli Affiliate: Anna Frebel | Summary:As part of the ongoing work of the $R$-Process Alliance (RPA), detailed abundance measurements of 29 heavy elements in three metal-poor stars, 2MASS J14592981$-$3852558, 2MASS J19445483$-$4039459, and 2MASS J15211026$-$0607566, are presented based on an analysis of high-resolution ($Rsim 80,000$), high signal-to-noise “portrait” spectra from the Magellan Inamori Kyocera Echelle (MIKE) […]


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A Quantum Gravitational Mechanism for Isotropization of de Sitter Cosmologies

Posted by klaurent Tokyo

Kavli Affiliate: David Spergel | Summary:Today, the observable cosmos exhibits a remarkable degree of isotropy and plausibly began in a nearly isotropic initial state. The properties of the Lorentzian Chern-Simons-Kodama (CSK) functional can provide an understanding of this initial state. In gravity with a positive cosmological constant, the Chern-Simons-Kodama (CSK) wavefunctional is an exact, chiral […]


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A Uniform Determination of the Bulk Metallicities and Alpha Enrichments of Confirmed Exoplanet Systems with TRES

Posted by klaurent Harvard

Kavli Affiliate: David Charbonneau | Summary:We present a uniform spectroscopic characterization of 625 F, G, and K stars hosting 859 confirmed exoplanets using high-resolution archival optical spectra from the Tillinghast Reflector Echelle Spectrograph (TRES). We use the neural network spectral code uberMS, which combines spectra with broadband photometry to estimate precise and accurate stellar parameters. […]


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Hippocampal theta frequency as a readout of path-integration recalibration

Posted by dbos Hopkins

Kavli Affiliate: James Knierim | Authors: Seong-Beom Park, Manu Madhav, Ravikrishnan P Jayakumar, Noah Cowan and James J Knierim | Summary: Understanding how the brain represents hidden variables is a fundamental challenge. In navigation, the internal path-integration gain is often masked by external landmarks that override the path integrator. Path integration can recalibrate its gain […]


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An agentic framework for gravitational-wave counterpart association in the multi-messenger era

Posted by klaurent Peking

Kavli Affiliate: Lijing Shao | Summary:With the detection of gravitational waves (GWs), multi-messenger astronomy has opened a new window for advancing our understanding of astrophysics, dense matter, gravitation, and cosmology. The GW sources detected to date are from mergers of compact object binaries, which possess the potential to generate detectable electromagnetic (EM) counterparts. Searching for […]


Continue.. An agentic framework for gravitational-wave counterpart association in the multi-messenger era

An agentic framework for gravitational-wave counterpart association in the multi-messenger era

Posted by klaurent Peking

Kavli Affiliate: Lijing Shao | Summary:With the detection of gravitational waves (GWs), multi-messenger astronomy has opened a new window for advancing our understanding of astrophysics, dense matter, gravitation, and cosmology. The GW sources detected to date are from mergers of compact object binaries, which possess the potential to generate detectable electromagnetic (EM) counterparts. Searching for […]


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Spin Seebeck effect in magnetic junctions with a compensated ferrimagnet

Posted by klaurent UCAS

Kavli Affiliate: Mamoru Matsuo | Summary:Compensated ferrimagnets enable ferromagnet-like spin transport without net magnetization. We study the spin Seebeck effect in a compensated ferrimagnet/normal-metal junction using a four-sublattice model in which sublattice inequivalence arises from differences in exchange couplings, in contrast to the previously studied anisotropy-based mechanism. Within the nonequilibrium Green’s function framework, we show […]


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