EPISODE II: Variability in the CO and H$_2$O rovibrational absorption lines in a periodically variable protostar EC 53

Posted by klaurent Peking

Kavli Affiliate: Gregory Herczeg | Summary:We present two-epoch JWST NIRSpec and MIRI observations of the young protostar EC 53 (V371 Ser), a periodically variable source with well-characterized quiescent and burst phases. The spectra in both epochs show absorption in the CO overtone ($sim$2.3 $μ$m) and fundamental ($sim$4.6 $μ$m) bands and the H$_2$O stretching ($sim$2.7 $μ$m) […]


Continue.. EPISODE II: Variability in the CO and H$_2$O rovibrational absorption lines in a periodically variable protostar EC 53

JWST reveals how black holes are fed: kiloparsec-scale multiphase filaments feed sub-kiloparsec circumnuclear disks

Posted by klaurent Cambridge

Kavli Affiliate: Roberto Maiolino | Summary:The Centaurus cluster is one of the most important archetypes of radio-mode AGN feedback, with its central galaxy, NGC 4696, launching powerful jets that inflate X-ray cavities and regulate cooling and star formation. NGC 4696 lies within a spectacular multiphase nebula of filaments extending over tens of kiloparsecs and spanning […]


Continue.. JWST reveals how black holes are fed: kiloparsec-scale multiphase filaments feed sub-kiloparsec circumnuclear disks

Halo mass functions in mixed cold and fuzzy dark matter models

Posted by klaurent Cambridge

Kavli Affiliate: George Efstathiou | Summary:We investigate the impact of mixed cold and fuzzy dark matter (MDM) cosmologies on the halo mass function (HMF) using numerical simulations performed with the AxiREPO framework. We consider models in which an ultralight axion-like component with mass $m =10^-24.5 mathrmeV$ constitutes a fraction $f leq 0.3$ of the total […]


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The Atacama Cosmology Telescope: Probing new signatures of ultralight axions with gravitational lensing

Posted by klaurent Cambridge

Kavli Affiliate: Blake Sherwin | Summary:Ultralight axions (ULAs) are well-motivated dark matter particle candidates that arise in many extensions of the Standard Model of particle physics. ULAs with mass $m_mathrma lesssim 10^-27$ eV have been strongly constrained by cosmic microwave background (CMB) observations in temperature and polarization. We fit recent measurements of gravitational lensing of […]


Continue.. The Atacama Cosmology Telescope: Probing new signatures of ultralight axions with gravitational lensing

Asymptotically-flat Black holes in Bumblebee gravity: Exact solutions and Thermodynamics

Posted by klaurent Peking

Kavli Affiliate: Lijing Shao | Summary:We construct analytic solutions to the bumblebee gravity theory in static and spherically symmetric spacetimes, where the bumblebee vector field admits only a non-vanishing temporal component. In particular, we identify the parameter space that allows for asymptotically flat black hole solutions. We further investigate the thermodynamic properties of these black […]


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A Space-Time Hidden Markov Model for In Vivo NanoScale Synaptic Plasticity Tracking

Posted by dbos Hopkins

Kavli Affiliate: Adam S. Charles, Michael Miller, and Richard Huganir | Authors: Shashwat Kumar, Gabrielle I Coste, Dasun Premathilaka, Richard L. Huganir, Austin R Graves, Adam S Charles and Michael I Miller | Summary: Synapses are the fundamental unit of neural connectivity, exhibiting dynamic functional and structural changes that enable the brain to learn, adapt, […]


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The DESI results impact the local determination of $H_0$

Posted by klaurent Chicago

Kavli Affiliate: Michael Turner | Summary:Measurements of baryon acoustic oscillations (BAO) by the Dark Energy Spectroscopic Instrument (DESI) have revealed evidence for dark energy that evolves. If local distance measurements are analyzed with the $w_0w_a$ models preferred by the DESI measurements, the value for the Hubble constant can be as much as $2.5,mathrmkm,s^-1Mpc^-1$ smaller than […]


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A Decade to Map the Diffuse Universe: FRB-QSO Pairs with HST/COS Spectroscopy

Posted by klaurent MIT

Kavli Affiliate: Kiyoshi Masui | Summary:Jointly analyzing the sightlines of arcsecond-localized fast radio bursts (FRBs) and UV-bright quasars (QSOs) nearby in projection has the potential to provide strong constraints on the phases, mass distributions, and magnetic structure of the diffuse universe. Each probe supplies what the other cannot: FRBs provide integrated electron columns (DM), line-of-sight […]


Continue.. A Decade to Map the Diffuse Universe: FRB-QSO Pairs with HST/COS Spectroscopy

Heavy-element paleodetectors for Higgsino dark matter

Posted by klaurent Stanford

Kavli Affiliate: Peter Graham | Summary:Paleodetectors have been proposed as a new approach to direct detection of weakly interacting massive particles (WIMPs), through the search for damage tracks in ancient minerals induced by WIMP-nucleon scattering. However, for inelastic dark matter such as the Higgsino, existing paleodetector targets lack sufficiently heavy nuclei to overcome the kinematic […]


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Little red dots as a cosmological probe: constraining $H_0$ with quasi-periodic pulsations

Posted by klaurent Peking

Kavli Affiliate: Kohei Inayoshi | Summary:The James Webb Space Telescope (JWST) has uncovered a population of “little red dots” (LRDs) at $z gtrsim 4$, potentially representing early supermassive black holes embedded in dense gaseous envelopes. The recent discovery of the lensed LRD RXJ2211-RX1 reveals significant variability on rest-frame timescales of decades, which may be interpreted […]


Continue.. Little red dots as a cosmological probe: constraining $H_0$ with quasi-periodic pulsations