Anshuman Acharya
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anshumanastro.bsky.social
Anshuman Acharya
@anshumanastro.bsky.social
BCCP Postdoctoral Fellow at UC Berkeley| PhD at MPA '25: Epoch of Reionization, 21-cm cosmology 📡, Machine Learning, cosmological sims | MS: CfA, Stellar X-rays | BS-MS IISER Mohali '21 | Sci-Comm | Sometimes write/doodle/make music! 🎸🎙️
The pub folks have excellent taste in music! 🥳
June 29, 2025 at 11:04 PM
Congratulations! 😄
June 24, 2025 at 2:21 PM
Some scientists do have superpowers after all! 😁
December 17, 2024 at 12:36 PM
But that's possibly an idea for something I can do beyond my PhD, as the time has come to tie together all these projects into my PhD thesis. 😄
December 16, 2024 at 12:41 PM
This leads to the need of finding ways to run high-resolution, large box simulations without having insane computational (and energy!) costs. At the very least, we want dark matter halo resolution (masses and positions) along with their merger trees.

For this, we look towards super-resolution!
December 16, 2024 at 12:41 PM
Lastly, we tested the new Polar sims which allows us to vary astrophysics in our sims along with varying cosmologies. We find that we can have multiple viable models that explain multiwavelength EoR observables, indicating the need for broad parameter spaces: ui.adsabs.harvard.edu/abs/2024arXi...
Exploring the effect of different cosmologies on the Epoch of Reionization 21-cm signal with POLAR
A detection of the 21-cm signal power spectrum from the Epoch of Reionization is imminent, thanks to consistent advancements from telescopes such as LOFAR, MWA, and HERA, along with the development of...
ui.adsabs.harvard.edu
December 16, 2024 at 12:41 PM
We also wanted to improve the measure of the 21-cm signal power spectrum at large scales, without running large volume simulations. For this, we ran RHD sims using the Fixed & Paired initial conditions formalism and boosted effective volume by a factor of 3.5: ui.adsabs.harvard.edu/abs/2024MNRA...
Cosmic variance suppression in radiation-hydrodynamic modelling of the reionization-era 21-cm signal
The 21-cm line emitted by neutral hydrogen is the most promising probe of the Epoch of Reionization (EoR). Multiple radio interferometric instruments are on the cusp of detecting its power spectrum. I...
ui.adsabs.harvard.edu
December 16, 2024 at 12:41 PM
applied it to real data even with older analysis pipelines in ui.adsabs.harvard.edu/abs/2024MNRA....

Also, this was tested against mock SKA data in the Science Data Challenge 3a, and got the best possible results too by a significant lead (sdc3.skao.int/challenges/f...)!
Revised LOFAR upper limits on the 21-cm signal power spectrum at z ≈ 9.1 using machine learning and gaussian process regression
The use of Gaussian Process Regression (GPR) for foregrounds mitigation in data collected by the LOw-Frequency ARray (LOFAR) to measure the high-redshift 21-cm signal power spectrum has been shown to ...
ui.adsabs.harvard.edu
December 16, 2024 at 12:41 PM
Firstly, I talked about using ML to build templates of the 21-cm signal power spectrum, which can be used to extract the signal by removing foregrounds and noise from LOFAR (or any other radio interferometer) data. We tested this with mock datasets in ui.adsabs.harvard.edu/abs/2024MNRA... and...
21-cm signal from the Epoch of Reionization: a machine learning upgrade to foreground removal with Gaussian process regression
In recent years, a Gaussian process regression (GPR)-based framework has been developed for foreground mitigation from data collected by the LOw-Frequency ARray (LOFAR), to measure the 21-cm signal po...
ui.adsabs.harvard.edu
December 16, 2024 at 12:41 PM
Thanks to @maxplanck.de, MPA and my supervisor for providing the support and funding for all of these exciting projects and the ability to showcase them in various places.
December 16, 2024 at 12:41 PM
Reposted by Anshuman Acharya
Something I tried to emphasize to the Schmidt Foundation a couple of years ago is that one of the ways to intervene in this pattern is for foundations that give out scicomm awards to provide academic winners with research funding so universities see there is fiscal value in supporting scicomm
December 11, 2024 at 3:33 AM
I'll be talking about pretty much everything I've done during my PhD:

from implementing ML-based templates for the IGM 21-cm signal from the Epoch of Reionization, to the development of new simulations, their needs, and current issues.

Also will discuss projects I hope to work on as a postdoc!
December 8, 2024 at 11:54 AM