Ryan Turner
@rjturner.bsky.social
cosmology-doer. degree-haver. puzzle-solver. described by friends and family as "On The Computer"
As a bonus, he was also able to get a measurement of the Hubble constant for his trouble! Their papers can be found:
JB: arxiv.org/abs/2512.03228
AC: arxiv.org/abs/2512.03232
I'm proud of the whole team for the effort we've put in, and now we have our results. Now onto the next data release...
JB: arxiv.org/abs/2512.03228
AC: arxiv.org/abs/2512.03232
I'm proud of the whole team for the effort we've put in, and now we have our results. Now onto the next data release...
December 4, 2025 at 4:25 AM
As a bonus, he was also able to get a measurement of the Hubble constant for his trouble! Their papers can be found:
JB: arxiv.org/abs/2512.03228
AC: arxiv.org/abs/2512.03232
I'm proud of the whole team for the effort we've put in, and now we have our results. Now onto the next data release...
JB: arxiv.org/abs/2512.03228
AC: arxiv.org/abs/2512.03232
I'm proud of the whole team for the effort we've put in, and now we have our results. Now onto the next data release...
We also needed mock datasets to test our analyses, get uncertainty estimates, and to just do the analysis at all really. This essential work was led by Prof. Julian Bautista. Lastly, we needed to calibrate these data in order to make any useful measurements. This was led by Dr. Anthony Carr.
December 4, 2025 at 4:25 AM
We also needed mock datasets to test our analyses, get uncertainty estimates, and to just do the analysis at all really. This essential work was led by Prof. Julian Bautista. Lastly, we needed to calibrate these data in order to make any useful measurements. This was led by Dr. Anthony Carr.
Our Fundamental Plane sample, made of ellipticals, was led by student Caitlin Ross. The Tully-Fisher sample, made of spirals, was led by A/Prof Kelly Douglass. I am blown away at the amount of work that has gone into these two papers.
CR: arxiv.org/abs/2512.03226
KD: arxiv.org/abs/2512.03227
CR: arxiv.org/abs/2512.03226
KD: arxiv.org/abs/2512.03227
December 4, 2025 at 4:25 AM
Our Fundamental Plane sample, made of ellipticals, was led by student Caitlin Ross. The Tully-Fisher sample, made of spirals, was led by A/Prof Kelly Douglass. I am blown away at the amount of work that has gone into these two papers.
CR: arxiv.org/abs/2512.03226
KD: arxiv.org/abs/2512.03227
CR: arxiv.org/abs/2512.03226
KD: arxiv.org/abs/2512.03227
The DESI PV survey is unique in that we measure peculiar velocities for both spiral and elliptical galaxies. Typically surveys are only equipped to do one or the other. This represents a tremendous amount of work by our data teams to collect, check, and format the data in a useable format
December 4, 2025 at 4:25 AM
The DESI PV survey is unique in that we measure peculiar velocities for both spiral and elliptical galaxies. Typically surveys are only equipped to do one or the other. This represents a tremendous amount of work by our data teams to collect, check, and format the data in a useable format
Dr. Fei Qin produced a power spectrum measurement, which is the Fourier-space analogue of my work. Dr. Yan Lai used the maximum-likelihood fields approach, which simultaneously models the density and velocity fields. Find their papers at:
FQ: arxiv.org/abs/2512.03231
YL: arxiv.org/abs/2512.03229
FQ: arxiv.org/abs/2512.03231
YL: arxiv.org/abs/2512.03229
December 4, 2025 at 4:25 AM
Dr. Fei Qin produced a power spectrum measurement, which is the Fourier-space analogue of my work. Dr. Yan Lai used the maximum-likelihood fields approach, which simultaneously models the density and velocity fields. Find their papers at:
FQ: arxiv.org/abs/2512.03231
YL: arxiv.org/abs/2512.03229
FQ: arxiv.org/abs/2512.03231
YL: arxiv.org/abs/2512.03229
We also had people working on other ways of measuring the same quantity, and when we combine our results we find that we measure the growth rate with 12% accuracy. While our velocity datasets are the largest homogenous catalogues ever, they represent only 1/5 of what we will obtain when DESI is done
December 4, 2025 at 4:25 AM
We also had people working on other ways of measuring the same quantity, and when we combine our results we find that we measure the growth rate with 12% accuracy. While our velocity datasets are the largest homogenous catalogues ever, they represent only 1/5 of what we will obtain when DESI is done
I was in charge of the analysis measuring the growth rate of structure, a parameter describing how densities in the universe coalesce under gravity, using the correlations between the positions of galaxies on the sky and their velocities. You can find my paper here: arxiv.org/abs/2512.03230
December 4, 2025 at 4:25 AM
I was in charge of the analysis measuring the growth rate of structure, a parameter describing how densities in the universe coalesce under gravity, using the correlations between the positions of galaxies on the sky and their velocities. You can find my paper here: arxiv.org/abs/2512.03230