gw-latam LATAM SEMINAR JULY 16
LATAM Seminars
Reminder: Call tomorrow
We invite you to the Latin American Gravitational Waves Seminar on Thursday, July 16, at 2:00 PM (Mexico City time), online.
The session will feature two 20-minute seminars (two speakers), each followed by a brief announcement discussion.
The meeting agenda is available here. You are welcome to add your announcements.
Speaker 1: Pablo Andrés Lizardo Romo, Universidad Autónoma de Zacatecas, México
Title: On phenomenological parametrizations for the luminosity distance of gravitational waves
Abstract: The propagation of gravitational waves offers a unique opportunity to test theories of gravity beyond General Relativity by studying the gravitational wave luminosity distance. This work evaluates existing mathematical models (parametrizations) used to describe changes in wave amplitude by comparing them with theoretical predictions from Quadratic Gravity and DHOST theories.
The study demonstrates that current models often work well in specific scenarios but lack universal generality. For example, some models are only suited for theories where gravity modifications disappear at late times. To address this, we propose a new parametrization (referred to as delta-X) that unifies and generalizes previous versions. This new formula provides a significantly better fit across a wider range of modified gravity models. These findings are intended to improve future tests of gravity using standard siren observations.Speaker 2: Alexander Bonilla Rivera,
Title: Fundamental physics with gravitational waves
Abstract: The detection of the high-frequency events GW150914 and GW170817 by the LIGO collaboration, and the strong evidence for the low-frequency stochastic gravitational-wave background (SGWB) by the NANOGrav and IPTA collaborations, laid the observational foundation for the new multi-messenger astronomy, but not without overcoming immense technological challenges. Regarding the LIGO-VIRGO events, there was initially a high degree of certainty that we were witnessing the merger of a binary system of compact objects (BH-BH/NS-NS). With the first event, we were able to obtain an estimate of the Hubble H0 parameter, and with the second, an estimate of the gravitational-wave velocity, among other important results. However, the NANOGrav results initially suggested that the strong evidence was due to a population of supermassive black hole (SMBH) mergers with low Bayes factor, as opposed to signals primarily from the early universe with higher Bayes factor, which is quite intriguing. In this talk, I will provide an introduction to the fundamental physics that can be explored with current and future detector data such as LISA, ET, and ANION, including the variation of fundamental constants, Lorentz invariance, the mass of the graviton, light Bosons (Gravitational Atoms), and other exotic topics. Finally, we will extend our study to the ultra-high frequency (UHF) gravitational wave spectrum, including data analysis with Machine Learning.
Remote access via Zoom:
https://udg-mx.zoom.us/j/9986411861
Meeting ID: 9986411861
Password: 054694
We encourage researchers and students working on gravitational waves to subscribe to seminars for the Latin American GW community: send an email to gw-latam+u...@googlegroups.com
If you would like to present a seminar, please fill out the following spreadsheetSeminars Annual program
Available dates:
August 13,
September 17,
October 15.
Kind regards,
The organizing committee.
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