Conveners
Parallel 1: DM + GW
- Kenji Nishiwaki (Shiv Nadar Institute of Eminence)
Description
DM + GW
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Saurabh Niyogi (Harish-Chandra Research Institute)10/07/2025, 15:00
In an effective field theory approach, we have considered a minimal extension of Standard Model is extended by a non-renormalizable dimension six operator of the form respecting the symmetries of the Standard Model. Such an operator can affect the dynamics of Higgs field and the electroweak phase transition. Presence of such term modifies the triple Higgs coupling. Constraint on the scale...
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SATYABRATA MAHAPATRA (Sungkyunkwan University)10/07/2025, 15:15
We propose a novel and comprehensive particle physics framework that addresses multiple cosmological tensions observed in recent measurements of the Hubble parameter, $S_8$, and Lyman-$\alpha$ forest data. Our model, termed `{SIDR+z_t}' (Self Interacting Dark Radiation with transition redshift), is based on an inelastic dark matter (IDM) scenario coupled with dark radiation, governed by a...
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Mr Partha Kumar Paul (Indian Institute of Technology Hyderabad)10/07/2025, 15:30
The singlet-doublet vector-like fermion dark matter model has been extensively studied in the literature over the past decade. An important parameter in this model is the singlet-doublet mixing angle ($\sin\theta$). All the previous studies have primarily focused on annihilation and co-annihilation processes for obtaining the correct dark matter relic density, assuming that the singlet and...
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Mr Shashwat Sharma (Indian Institute of Technology Hyderabad)10/07/2025, 15:45
The singlet-doublet dark matter model is one of the most studied WIMP scenarios to realize the relic of DM in a large parameter space. In this work, we study the two-step leptogenesis in the singlet-doublet Majorana dark matter model. We extend the Standard Model (SM) by introducing three Majorana singlet fermions ($N_i$), three doublet fermions ($\Psi_i$), and a singlet scalar ($\Phi$), all...
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Vicky Singh Thounaojam (Indian Institute of Technology, Hyderabad)10/07/2025, 16:00
We propose a GeV-scale self-interacting dark matter (SIDM) candidate within a $U(1)_D$ extension of the Standard Model (SM), addressing small-scale structure anomalies in $\Lambda$CDM while predicting an observable contribution to $\Delta N_{\rm eff}$. The model introduces a fermionic DM candidate $\chi$ and a scalar $\phi$, both charged under an unbroken $U(1)_D$ gauge symmetry. The...
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Sourav Saini10/07/2025, 16:15
The idea of cosmic inflation stands on the firm ground of observations from Big Bang nucleosynthesis and the cosmic microwave background. However, a missing piece remains—reheating—which connects inflation to the radiation-dominated universe, a crucial stage for the nucleosynthesis process. A key observable of the reheating stage is stochastic gravitational waves, generated by the decay of the...
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