First Insights into the ISM at $z>8$ with JWST: Possible Physical Implications of a High [O III]$mathbf{λ4363}$/[O III]$mathbf{λ 5007}$

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Harley Katz, Aayush Saxena, Alex J. Cameron, Stefano Carniani, Andrew J. Bunker | Summary: We present a detailed analysis of the rest-frame optical emission line ratios for three spectroscopically confirmed galaxies at $z>7.5$. The galaxies were identified in the James Webb Space Telescope (JWST) Early Release Observations […]


Continue.. First Insights into the ISM at $z>8$ with JWST: Possible Physical Implications of a High [O III]$mathbf{λ4363}$/[O III]$mathbf{λ 5007}$

Relative baryon-dark matter velocities in cosmological zoom simulations

Kavli Affiliate: George Efstathiou | First 5 Authors: Luke Conaboy, Ilian T. Iliev, Anastasia Fialkov, Keri L. Dixon, David Sullivan | Summary: Supersonic relative motion between baryons and dark matter due to the decoupling of baryons from the primordial plasma after recombination affects the growth of the first small-scale structures. Large box sizes (greater than […]


Continue.. Relative baryon-dark matter velocities in cosmological zoom simulations

Relative baryon-dark matter velocities in cosmological zoom simulations

Kavli Affiliate: George Efstathiou | First 5 Authors: Luke Conaboy, Ilian T. Iliev, Anastasia Fialkov, Keri L. Dixon, David Sullivan | Summary: Supersonic relative motion between baryons and dark matter due to the decoupling of baryons from the primordial plasma after recombination affects the growth of the first small-scale structures. Large box sizes (greater than […]


Continue.. Relative baryon-dark matter velocities in cosmological zoom simulations

Marginal Bayesian Statistics Using Masked Autoregressive Flows and Kernel Density Estimators with Examples in Cosmology

Kavli Affiliate: George Efstathiou | First 5 Authors: Harry Bevins, Will Handley, Pablo Lemos, Peter Sims, Eloy de Lera Acedo | Summary: Cosmological experiments often employ Bayesian workflows to derive constraints on cosmological and astrophysical parameters from their data. It has been shown that these constraints can be combined across different probes such as Planck […]


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Optical design concept of the CMB-S4 large-aperture telescopes and cameras

Kavli Affiliate: Richard Hills | First 5 Authors: Patricio A. Gallardo, Bradford Benson, John Carlstrom, Simon R. Dicker, Nick Emerson | Summary: CMB-S4 — the next-generation ground-based cosmic microwave background (CMB) experiment – will significantly advance the sensitivity of CMB measurements and improve our understanding of the origin and evolution of the universe. CMB-S4 will […]


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The Gravitational Afterglow of Boson Stars

Kavli Affiliate: Ulrich Sperhake | First 5 Authors: Robin Croft, Thomas Helfer, Bo-Xuan Ge, Miren Radia, Tamara Evstafyeva | Summary: In this work we study the long-lived post-merger gravitational wave signature of a boson-star binary coalescence. We use full numerical relativity to simulate the post-merger and track the gravitational afterglow over an extended period of […]


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Characterization of JWST science performance from commissioning

Kavli Affiliate: Roberto Maiolino | First 5 Authors: Jane Rigby, Marshall Perrin, Michael McElwain, Randy Kimble, Scott Friedman | Summary: This document characterizes the actual science performance of the James Webb Space Telescope (JWST), as known on 12 July 2022. Following six months of commissioning to prepare JWST for science operations, the observatory is now […]


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B-mode constraints from Planck low multipole polarisation data

Kavli Affiliate: George Efstathiou | First 5 Authors: Roger de Belsunce, Steven Gratton, George Efstathiou, , | Summary: We present constraints on primordial B modes from large angular scale cosmic microwave background polarisation anisotropies measured with the Planck satellite. To remove Galactic polarised foregrounds, we use a Bayesian parametric component separation method, modelling synchrotron radiation […]


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LyC escape from SPHINX galaxies in the Epoch of Reionization

Kavli Affiliate: Martin Haehnelt | First 5 Authors: Joakim Rosdahl, Jérémy Blaizot, Harley Katz, Taysun Kimm, Thibault Garel | Summary: We measure escape fractions, $f_{rm esc}$, of ionizing radiation from galaxies in the SPHINX suite of cosmological radiation-hydrodynamical simulations of reionization, resolving halos with $M_{rm vir} gtrapprox 7.5 times 10^7 M_{odot}$ with a minimum cell […]


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A non-linear solution to the $S_8$ tension?

Kavli Affiliate: George Efstathiou | First 5 Authors: Alexandra Amon, George Efstathiou, , , | Summary: Weak galaxy lensing surveys have consistently reported a lower amplitude for the matter fluctuation spectrum, as measured by the $S_8$ parameter, than expected in the $Lambda{rm CDM}$ cosmology favoured by $Planck$. However, the expansion history follows the predictions of […]


Continue.. A non-linear solution to the $S_8$ tension?