Kavli Affiliate: Feng Long| Summary: We develop an adaptive jump test for discretely observed high-frequency semimartingales by combining the A"it-Sahalia–Jacod ratio statistic (A"it-Sahalia and Jacod, 2009) and the Lee–Mykland extreme-return statistic (Lee and Mykland, 2008) with the Cauchy combination rule. Allowing stochastic It^o drift, volatility, and leverage, we show asymptotic independence under the continuous-path null […]
Kavli Affiliate: Feng Long| Summary: We develop an adaptive jump test for discretely observed high-frequency semimartingales by combining the A"it-Sahalia–Jacod ratio statistic (A"it-Sahalia and Jacod, 2009) and the Lee–Mykland extreme-return statistic (Lee and Mykland, 2008) with the Cauchy combination rule. Allowing stochastic It^o drift, volatility, and leverage, we show asymptotic independence under the continuous-path null […]
Kavli Affiliate: Timothy Brown | Authors: Kristen C Ruegg, Christen M Bossu, Reza Goljani Amirkhiz, Nikunj Goel, Erica CN Robertson, Timothy M Brown, Kathryn Bernier, Ben J Vernasco, Peri E Bolton, Erik R Funk, Scott A Taylor, Mevin B Hooten and Erika S Zavaleta | Summary: Accelerated warming at high elevations is having a disproportionate […]
Kavli Affiliate: Massimo Scanziani and Jeanne Paz | Authors: Joshua M. Brenner, Sarah Ruediger, Cameron Wilhite, Josue M. Regalado, Yuta Senzai, Yuliya Voskobiynyk, Jeanne T. Paz, Massimo Scanziani and Riccardo Beltramo | Summary: Mammals rely on their senses to establish their position in space. Neural activity in the hippocampus maps position, yet how sensory signals […]
Kavli Affiliate: Pietro De Camilli | Authors: Devin M Fuller, Yumei Wu, Florian Schueder, Burha Rasool, Shanta Nag, Justin L. Korfhage, Rolando Garcia-Milian, Katerina D Melnyk, Joerg Bewersdorf, Pietro De Camilli and Thomas Melia | Summary: Autophagosomes form from seed membranes that expand through bulk-lipid transport via the bridge-like lipid transporter ATG2. The origins of […]
Kavli Affiliate: Gordan Krnjaic | Summary:In the standard thermal relic scenario, dark matter remains in chemical equilibrium with the Standard Model radiation bath until freeze-out occurs at $T sim m_X/20$, where $m_X$ is the dark matter mass. In this familiar class of models, the observed relic density is obtained for annihilation cross sections of order […]
Kavli Affiliate: Saul Rappaport | Summary:We present the discovery and characterization of TIC 295741342, a triply-eclipsing triple star system with a giant tertiary. The eclipsing binary consists of two similar main-sequence stars in a 4.75-day orbit. The binary is in a 412.8-day orbit with the giant tertiary. We found two degenerate solutions for the system: […]
Kavli Affiliate: Anthony Lasenby | Summary:For electromagnetism in Minkowski spacetime, the Bessel-Hagen method gives a particularly direct Noetherian derivation of the standard gauge-invariant energy-momentum tensor. The key step is to supplement the form variation generated by an infinitesimal coordinate transformation with a compensating electromagnetic gauge transformation. In this paper we ask whether the same idea […]
Kavli Affiliate: Huawei Zhang | Summary:Metal-poor stars are crucially important for understanding the early Galaxy, first stars, and the Universe. In this series of papers, we present a homogeneous non-local thermodynamic equilibrium (NLTE) abundances analysis of 12 elements for 103 very/extremely metal-poor (VMP/EMP) stars with metallicity down to $-4.3$ dex. The sample was selected from […]
Kavli Affiliate: Gabor Furesz | Summary:Random telegraph noise (RTN) is a major contributor to read noise in many CMOS image sensors considered for astronomical use. While scientific CMOS image sensors deliver lower read noise than traditional charge-coupled devices, mitigating RTN would widen this gap and enable more precise photometry when using the fast readout rates […]