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Missing baryons recovered with kSZ + CMB lensing

Fri, 18 Jul 2025 00:00:00 +0000

The paper — first-authored by Boryana Hadzhiyska, with Simone Ferraro, Noah Sailer, Rongpu Zhou and me — is now in Phys. Rev. D. It sheds new light on the distribution and abundance of baryons around DESI galaxy groups.

More context .

PRL: Resolving cosmological tensions with reionization

Wed, 23 Apr 2025 00:00:00 +0000

is published in Physical Review Letters ( ). Joint first-authored with Noah Sailer, with Simone Ferraro and Martin White, the paper shows that a moderate $\tau$ increase — within data — can absorb recent $\Lambda$CDM tensions without invoking new physics.

More context on the paper page itself: .

The New York Times: An astronomer hunting dark energy with DESI

Wed, 19 Mar 2025 00:00:00 +0000

ACT DR6 main release

Tue, 18 Mar 2025 00:00:00 +0000

The ACT collaboration has released the DR6 maps, power spectra, likelihoods, and the corresponding cosmological constraints — a milestone the collaboration has been building toward for years. The main papers:

(Louis et al.)
(Calabrese et al.)
(Naess et al.)

Joining LBNL as Owen Chamberlain Postdoctoral Fellow

Sun, 22 Sep 2024 00:00:00 +0000

I’ve started my Owen Chamberlain Postdoctoral Fellowship in the Physics Division at Lawrence Berkeley National Laboratory, after completing my PhD at Cambridge in July. Looking forward to leading new CMB lensing × galaxy survey analyses with the DESI and Simons Observatory collaborations here at LBNL.

New paper: multi-probe cosmology with unWISE × ACT DR6 CMB lensing

Tue, 03 Sep 2024 00:00:00 +0000

Our paper is now on the arXiv ( ) and submitted to Phys. Rev. D. It builds directly on our 2023 ApJ paper, jointly fitting galaxy auto-correlation, galaxy–lensing cross-correlation, and the CMB lensing auto-spectrum to deliver tighter constraints on structure growth.

BBC News: Mysterious dark matter mapped in finest detail yet

Tue, 11 Apr 2023 00:00:00 +0000