[Physics-grads-open] (Topic changed!) Physics & Astronomy Student Seminar (PASS), June 6th at 4 pm, Phys 3027

[Ming-Feng Ho]

Hi all,

*The original speaker couldn't make it for today.* Alternatively, I will
give a short talk on my research to finish this quarter's PASS seminar
series.

After the talk, we will have a short organizing meeting to discuss how to
improve future PASS. We will also discuss how to carry out the summer PASS
session.

*Title: Bayesian models for finding DLAs and measuring quasar redshifts
using Gaussian processes*

Ming-Feng Ho (University of California, Riverside)

*Abstract:* Part I: We present a machine learning model for automating the
detection of damped Lyman alpha absorbers (DLAs) in quasar spectra. Our
model is based on Gaussian processes with a tailored covariance function
learned from data. We train our model on SDSS DR9 and validate it on SDSS
DR12 with ~96% accuracy. The same model is re-trained on SDSS DR12 and
provides a DLA catalog for SDSS DR16 with posterior samples for each
spectrum.

Part II: We demonstrate a probabilistic framework for finding DLAs with
unknown quasar redshifts. Our redshift model is an extension of our
previous DLA model with known quasar redshifts. We show that the extended
model can simultaneously marginalize DLA detection and quasar estimation
with a small decrease in accuracy. The extended model can also be used as a
quasar redshift estimator.

Monday, June 6, 2022 at 4 pm
Physics 3027 (Nebula Room)

To submit abstracts for Summer Quarter: [Abstract Submission
<https://jibancat.github.io/ucr-student-seminars/registration/index.html>].

Best,
Ming-Feng


On Fri, Jun 3, 2022 at 4:30 PM Ming-Feng Ho <mingfeng.ho at email.ucr.edu>
wrote:

> Hi all,
>
> We are going to have our final PASS seminar talk this quarter. We are very
> happy to have our first condensed matter theory talk in PASS, given by Pak
> Kau Lim (from Michael Mulligan's group). He will be reviewing the
> renormalization group approach in condensed matter theory.
>
> *Title: Review on the Renormalization Group Approach*
>
> Pak Kau Lim (University of California, Riverside)
>
> *Abstract:* Before shifting my focus to my works, I'd like to review a
> series of background materials until mid-summer. These are broader topics
> that are either related to my research or materials that I found
> interesting but have yet to encounter. In my upcoming PASS talk on Monday,
> I will discuss the renormalization group approach in lower dimension
> condensed matter theories.
>
> Monday, June 6, 2022 at 4 pm
> Physics 3027 (Nebula Room)
>
> Details of the PASS program, please find here [Program
> <https://jibancat.github.io/ucr-student-seminars/program/index.html>].
>
> We have three presenters (Mahdi Qezlou, Reza Monadi, and Elizabeth Finney)
> queued in the Summer Quarter. We will send another email in the first week
> of the summer to determine the date/time for the summer PASS series since
> people's availability might change.
>
> To submit abstracts for Summer Quarter: [Abstract Submission
> <https://jibancat.github.io/ucr-student-seminars/registration/index.html>
> ].
>
> Hope to see you there!
> Ming-Feng Ho
>
>
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