Tootfinder

Very impressed that @… amended his slides after Elizabeth Tucker's session with @… !
#smx

Sooo - Google March Core update was, as we know, two updates and was the biggest they have done by far. Didn't all go to plan, hence the 45 day roll out.
Watching @… on #smx conf.
Also pink backgrounds might be soon written about as a ranking factor (they …

Fiducial-Cosmology-dependent systematics for the DESI 2024 BAO Analysis
A. P\'erez-Fern\'andez, L. Medina-Varela, R. Ruggeri, M. Vargas-Maga\~na, H. Seo, N. Padmanabhan, M. Ishak, J. Aguilar, S. Ahlen, S. Alam, O. Alves, S. Brieden, D. Brooks, A. Carnero Rosell, X. Chen, T. Claybaugh, S. Cole, K. Dawson, A. de la Macorra, A. de Mattia, Arjun Dey, Z. Ding, P. Doel, K. Fanning, C. Garcia-Quintero, E. Gazta\~naga, S. Gontcho A Gontcho, G. Gutierrez, K. Honscheid, S. Juneau, D. Kirkby, T. Kisner, A. Lambert, M. Landriau, J. Lasker, L. Le Guillou, M. Manera, P. Martini, A. Meisner, J. Mena-Fern\'andez, R. Miquel, J. Moustakas, A. D. Myers, S. Nadathur, J. A. Newman, G. Niz, E. Paillas, N. Palanque-Delabrouille, W. J. Percival, C. Poppett, F. Prada, M. Rashkovetskyi, A. Rocher, G. Rossi, A. Sanchez, E. Sanchez, M. Schubnell, D. Sprayberry, G. Tarl\'e, D. Valcin, B. A. Weaver, J. Yu, H. Zou
https://arxiv.org/abs/2406.06085 https://arxiv.org/pdf/2406.06085
arXiv:2406.06085v1 Announce Type: new
Abstract: When measuring the Baryon Acoustic Oscillations (BAO) scale from galaxy surveys, one typically assumes a fiducial cosmology when converting redshift measurements into comoving distances and also when defining input parameters for the reconstruction algorithm. A parameterised template for the model to be fitted is also created based on a (possibly different) fiducial cosmology. This model reliance can be considered a form of data compression, and the data is then analysed allowing that the true answer is different from the fiducial cosmology assumed. In this study, we evaluate the impact of the fiducial cosmology assumed in the BAO analysis of the Dark Energy Spectroscopic Instrument (DESI) survey Data Release 1 (DR1) on the final measurements in DESI 2024 III. We utilise a suite of mock galaxy catalogues with survey realism that mirrors the DESI DR1 tracers: the bright galaxy sample (BGS), the luminous red galaxies (LRG), the emission line galaxies (ELG) and the quasars (QSO), spanning a redshift range from 0.1 to 2.1. We compare the four secondary AbacusSummit cosmologies against DESI's fiducial cosmology (Planck 2018). The secondary cosmologies explored include a lower cold dark matter density, a thawing dark energy universe, a higher number of effective species, and a lower amplitude of matter clustering. The mocks are processed through the BAO pipeline by consistently iterating the grid, template, and reconstruction reference cosmologies. We determine a conservative systematic contribution to the error of $0.1\%$ for both the isotropic and anisotropic dilation parameters $\alpha_{\rm iso}$ and $\alpha_{\rm AP}$. We then directly test the impact of the fiducial cosmology on DESI DR1 data.

Nuclear Reactor Data Excludes Cosmological Triangle in Search for Axion-Like Particles
Byung Ju Park, Jae Jin Choi, Eunju Jeon, Jinyu Kim, Kyungwon Kim, Sung Hyun Kim, Sun Kee Kim, Yeongduk Kim, Young Ju Ko, Byoung-Cheol Koh, Chang Hyon Ha, Seo Hyun Lee, In Soo Lee, Hyunseok Lee, Hyun Su Lee, Jaison Lee, Yoomin Oh
https://arxiv.…

Nuclear Reactor Data Excludes Cosmological Triangle in Search for Axion-Like Particles
We report new constraints on axion-like particle (ALP) using data corresponding to a sodium iodine target exposure of 3063\,kg$\cdot$days from the neutrino elastic scattering observation with NaI (NEON) experiment. A 16.7\,kg of thallium-doped sodium iodide target was located 23.7 meters from a 2.8\,GW thermal power nuclear reactor. We searched for ALPs produced by high-flux photons by comparing the energy spectra of data collected during reactor-on (1596\,kg$\cdot$days exposure) and reactor-of…

I made some rock faces from fir tree bark.
Read more here:
#modelmaking

Just darned a sock.
#MyExcitingLife

Things that really niggle me.
1. Missing the start of Test Match Special Coverage.
2. BBC Radio 5 Live Sports Extra looped advert between programmes. Especially when the advertised programme is running 8 mins late already.
#cricket

Have spent a few moments today pulling in nearly 3 million lines of JSON code from my Spotify listening history, 2010 -2024, into Looker studio.
Goldfrap Voicething is winning. (bit of a surprise!)

I am having a lovely chat on zoom with @… - what a lovely chap!

Have spent a few moments today pulling in nearly 3 million lines of JSON code from my Spotify listening history, 2010 -2024, into Looker studio.
Goldfrap Voicething is winning. (bit of a surprise!)