Praween Siritanasak

National Astronomical Research Institute of Thailand

260 Moo 4, T. Donkaew, A. Maerim

Chiangmai 50180, Thailand

Praween Siritanasak (Thai: ประวีณ สิริธนศักดิ์) was born and raised in Bangkok, Thailand. He earned his bachelor’s degree in Physics (First-class honors) from the Faculty of Science, Mahidol University, Thailand in 2009. In the same year, he received a fully-funded Royal Thai Government scholarship to pursue a doctoral degree in physics and astrophysics. He completed his Ph.D. from the Department of Physics at the University of California, San Diego in June 2018. From 2018–2020, he worked as a postdoctoral fellow in experimental cosmology at the Center for Astrophysics and Space Sciences (CASS) at UC San Diego under the supervision of Professor Brian Keating. He is currently working as a researcher at the National Astronomical Research Institute of Thailand (NARIT), Chiangmai, Thailand.

His research spans two fronts: CMB polarization through the POLARBEAR/Simons Array experiment in the Atacama Desert, Chile — building and testing ultra-sensitive detectors to hunt for primordial B-mode signals from the early Universe — and the search for dark photons with the Siam Dark Photon Consortium, chasing hints of hidden physics beyond the Standard Model.

Outside of research, Praween is an avid runner who has completed both ultra marathons and full marathons, with an ambition to earn the Abbott World Marathon Majors Six Star Medal. At heart, he is a nature lover who thrives on exploration — whether diving beneath the ocean, hiking up mountain trails, wandering new places, capturing the world through a lens, or simply lying back and losing himself in the night sky.

Check his Ph.D. Genealogy.

latest posts

Nov 02, 2020	ฝนเทียม : rain making

selected publications

arXiv

Predictive Power of Daily Viscacha and Vicuña Sightings on Simons Array Site Work Results

P. Siritanasak, I. Birdwell, L. Lowry, and 2 more authors

arXiv preprint, 2023

Abs arXiv HTML

We examine whether the daily number of viscacha and vicuña sightings at the Simons Array site in the Atacama Desert, Chile can predict operational work outcomes. Over 31 observation days, we find no statistically significant correlation between animal sightings and site work results, providing a lighthearted but rigorous statistical analysis of a site tradition.
ApJ

Measurement of the Cosmic Microwave Background Polarization Lensing Power Spectrum from Two Years of POLARBEAR Data

M. Aguilar Faúndez, K. Arnold, C. Baccigalupi, and 82 more authors

The Astrophysical Journal, 2020

Abs DOI arXiv HTML

We present a measurement of the CMB polarization lensing power spectrum using two years of POLARBEAR observations from 2012 to 2014. We reject the no-lensing hypothesis at a confidence level of 10.9 sigma and report a lensing amplitude of A_L = 1.33^+0.46_-0.43(stat+sys), consistent with the \LambdaCDM expectation of A_L = 1.
ApJ

A Measurement of the Degree-Scale CMB B-Mode Angular Power Spectrum with POLARBEAR

S. Adachi, M. A. O. Aguilar Faúndez, K. Arnold, and 83 more authors

The Astrophysical Journal, 2020

Abs DOI arXiv HTML

We present a measurement of the CMB B-mode polarization power spectrum at degree scales with POLARBEAR. Observations at 150 GHz from 2014 to 2016 achieved a polarization map noise of 32 \muK-arcmin with sensitivity optimized around multipole \ell ≈90, where inflationary gravitational wave signals are predicted to be strongest. The measured spectrum is consistent with \LambdaCDM lensing and Galactic dust foreground models.
PRL

Internal Delensing of Cosmic Microwave Background Polarization B-Modes with the POLARBEAR Experiment

S. Adachi, M. A. O. Aguilar Faúndez, Y. Akiba, and 82 more authors

Physical Review Letters, 2020

Abs DOI arXiv HTML

We demonstrate internal delensing of CMB polarization B-modes using only POLARBEAR CMB polarization data at subdegree scales, achieving greater than 5-sigma significance. A 14% reduction in B-mode power variance is achieved through internal delensing, improving to 2% with an iterative maximum a posteriori approach. This work demonstrates the capability of internal delensing for improving constraints on inflationary models.
ApJ

A Measurement of the Cosmic Microwave Background B-Mode Polarization Power Spectrum at Sub-Degree Scales from 2 Years of POLARBEAR Data

The POLARBEAR Collaboration, P. A. R. Ade, M. Aguilar, and 91 more authors

The Astrophysical Journal, 2017

Abs DOI arXiv HTML

We present improved CMB B-mode polarization power spectrum measurements at 150 GHz combining data from two POLARBEAR observation seasons. By incorporating 2013–2014 data with re-analyzed 2012–2013 observations, we achieve a twofold reduction in band-power uncertainties across angular multipoles 500–2100, constraining the lensing B-mode amplitude to A_\mathrmlens = 1.06 \pm 0.24\mathrm(stat) \pm 0.11\mathrm(sys).
JLTP

The Broadband Anti-Reflection Coated Extended Hemispherical Silicon Lenses for POLARBEAR-2 Experiment

P. Siritanasak, P. Ade, Y. Akiba, and 70 more authors

Journal of Low Temperature Physics, 2016

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We present the design and fabrication of broadband anti-reflection (AR) coated extended hemispherical silicon lenses for the POLARBEAR-2 experiment. Each of the 1897 dual-polarization sinuous antenna-coupled pixels in the PB-2 receiver uses a directly contacting silicon lenslet, requiring broad-band AR coatings across 95–150 GHz. We developed a two-layer epoxy-based AR coating using Stycast 1090 and Stycast 2850FT and characterize its optical performance.
ApJ

A Measurement of the Cosmic Microwave Background B-Mode Polarization Power Spectrum at Sub-Degree Scales with POLARBEAR

The POLARBEAR Collaboration, P. A. R. Ade, Y. Akiba, and 64 more authors

The Astrophysical Journal, 2014

Abs DOI arXiv HTML

We report a measurement of the B-mode polarization power spectrum of the CMB with POLARBEAR at 150 GHz. Observations over approximately 25 deg^2 across three independent fields at 500 < \ell < 2100 provide evidence for a non-zero B-mode signal at 2.3σsignificance. The best-fit lensing amplitude is A_\mathrmlens = 1.12 \pm 0.61\mathrm(stat)^+0.04_-0.12\mathrm(sys) \pm 0.07\mathrm(mul).
PRL

Measurement of the Cosmic Microwave Background Polarization Lensing Power Spectrum with the POLARBEAR Experiment

The POLARBEAR Collaboration, P. A. R. Ade, Y. Akiba, and 64 more authors

Physical Review Letters, 2014

Abs DOI arXiv HTML

We present the first direct measurement of the CMB polarization lensing power spectrum with POLARBEAR using four-point correlations of E- and B-mode polarization data across approximately 30 square degrees of sky, providing direct evidence for gravitational lensing of the CMB polarization.
PRL

Evidence for Gravitational Lensing of the Cosmic Microwave Background Polarization from Cross-Correlation with the Cosmic Infrared Background

The POLARBEAR Collaboration, P. A. R. Ade, Y. Akiba, and 64 more authors

Physical Review Letters, 2014

Abs DOI arXiv HTML

We reconstruct gravitational lensing signals from CMB polarization measurements from POLARBEAR and cross-correlate them with infrared background maps from the Herschel satellite. We detect evidence for gravitational lensing of the CMB polarization at 4.0σstatistical significance.