High Energy Physics Seminars next week - Majumdar and Laha

[HECAP - Margherita Di Giovannantonio]

*_HIGH ENERGY PHYSICS SEMINARS_*
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*Tuesday, 14 July *2026, at *16:00* - *_Lagrange Lecture 
Hall_***-*https://indico.ictp.it/event/11326/*


Suman Majumdar (Indian Institute of Technology, Indore)


*“'Emulator is all you need' for the Reionization Inference With SKA-Low"*
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_Abstract_

The cosmologically redshifted 21-cm signal originating from the neutral 
hydrogen distribution during the Epoch of Reionization (EoR) provides a 
direct probe to the state of the intergalactic medium in this formative 
phase of our Universe. The upcoming Square Kilometre Array (SKA-Low) is 
expected to observe this signal with unprecedented sensitivity and 
resolution. However, interpretation of such observations is complex due 
to the strong inherent and evolving non-Gaussian nature of the signal. 
In this talk, I will discuss our efforts towards the development of 
machine learning based 21-cm signal emulators designed to accelerate 
parameter inference by circumventing expensive simulations of this 
signal. Starting with the development of emulators based on Neural 
Networks for different summary statistics of the signal e.g. power 
spectrum and bispectrum, conditioned on reionization model parameters, 
we have recently developed CosmoUiT, a hybrid Vision Transformer-UNet 
architecture that emulates the entire time evolving 21-cm field as 
expected to be observed by the upcoming SKA-Low. CosmoUiT is orders of 
magnitude faster than simulations—while maintaining high fidelity to 
emulated maps--enabling field-level inference for future SKA observations.


To attend via _*Zoom*_, please *_register_* here:
https://zoom.us/meeting/register/9pRHed56TzSLxb3eDeajLw


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*Thursday, 16 July *2026, at *16:00* - *_L. Stasi Seminar 
Room_***-*https://indico.ictp.it/event/11389/*


Ranjan Laha (Indian Institute of Science, Bengaluru)


*“Searching for Dark Matter Using Two Different Observables: **JWST 
UV** Luminosity Function Measurements and Very-High-Energy Gamma-Ray 
Observations by Tibet **AS_\gamma and LHAASO**"*
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_Abstract_

Searching for non-gravitational interactions of dark matter in one of 
the major research areas in science.  In this talk, I will describe two 
different ways to discover the nature of dark matter.
In the first part of my talk, I will discuss how one can use the UV 
luminosity function measurements to derive leading constraints on dark 
matter - baryon scattering.  These constraints will further improve as 
JWST discovers more distant galaxies.
In the second part of my talk, I will discuss the discovery of 
high-energy diffuse gamma-rays by the Tibet AS_\gamma and LHAASO 
collaborations help us in deriving some of the most stringent 
constraints on dark matter decay life-time.

To attend via _*Zoom*_, please *_register_* here:
https://zoom.us/meeting/register/6SAcU9VLS-CdXFZWwIY1Eg