Preface

The 16th SIAM PHYSICS CONGRESS (SPC2021) B Chatthong1,a, C Buranachai1,b, P Kalasuwan1,c, S Rakkapao1,d, C Putson1,e, B Soonthornthum2,3,f,g and S Aukkaravittayapun2,3,f,h 1Division of Physical Science, Faculty of Science, Prince of Songkla University, Songkhla, Thailand 2Thai Physics Society, Chiang Mai, Thailand 3National Astronomical Research Institute, Chiang Mai, Thailand Email: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected] The 16th Siam Physics Congress (SPC2021) was successfully held 100% online during May 24-25, 2021. Initially, the Thai Physics Society and Prince of Songkla University had planned to co-host the SPC2021 in Songkhla province in Southern part of Thailand via hybrid form. Unfortunately, due to the rise of coronavirus (COVID-19) pandemic cases in Thailand, the organizing committee had considered that physical conference would no longer be possible, and made 100% online decision. This is to keep up to the highest standard of health regulation and self-practice (from WHO) in avoiding the extremely serious pandemic. Consequently, the Thai Physics Society and Prince of Songkla University had facilitated and hosted the SPC2021 as national teleconference during May 24-25, 2021. This year, we had 185 research abstracts and papers submitted for both oral and poster online presentations. There were 1 plenary speaker, 25 invited speakers, 76 oral presentations, 83 poster presentations, and 99 full papers submitted for possible publication in all 21 tracks(topics). The scientific program was announced on the SPC2021 website (https://spc2021.sci.psu.ac.th/) and also distributed via email to all participants. The SPC2021 oral sessions were held via Zoom video conference. Participants can join online sessions either by using their individual Zoom account. The Zoom’s chat channel as well as professional management such as co-hosting the Zoom room from the host-side were employed to alleviate some glitches (e.g. delayed or unclear signals due to slow internet connection from the client-side). In addition, the chat channel was also used for exchanging contact details for further detailed discussion about the presentation. The online opening ceremony and plenary talk was live-broadcasted via Faculty of Science, Prince of Songkla University official Facebook page and YouTube account. After the online opening ceremony, a plenary talk entitled “Exploring the Universe with neutrinos and gravitational waves” by Professor Takaaki Kajita, 2015 Nobel Laureate in Physics from Institute for Cosmic Ray Research, The University of Tokyo, Tokyo, Japan, was given to the audience of approximately 200 participants. The oral presentations were arranged into 3 parallel Zoom rooms in total of 16 sessions. Each invited speaker was allowed 30-minute presentation while regular presenter had 15 minutes including questions and answers. The online audience-size of each room varied between 30 and 60 people. The poster presentations were uploaded onto the SPC2021 Indico website (https://indico.cern.ch/event/973315/), where only registered participants could access. In addition, all participants can login, access all abstracts as well as presentation materials, and submit the full paper. List of Editorial Materials, Logos are available in this pdf.