Majorana-Raychaudhuri Seminars

Welcome to Majorana-Raychaudhuri Seminars. We organise seminars in the field of Quantum Field Theory, Gravitation, Cosmology and Particle Physics on Fridays at 16.30 - 18.00 (IST*)  / 12.00 - 13.00 (CET*) as a joint venture of INFN & University Salerno, Italy & PAMU, Indian Statistical Institute, Kolkata, India.

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Seminars This Week:

*IST: Indian Standard Time*CET: Central European Time*CEST: Central European Summer Time
RNM.pdf

January 10, 2025: (15:00 - 16:00 CET/ 19:30 - 20:30 IST)

Speaker: Rabindra N. Mohapatra (University of Maryland, US)

Title: A Grand unified solution to the Axion Quality Problem

Abstract: Invisible axion models that solve the strong CP problem via the Peccei-Quinn (PQ) mechanism typically have a quality problem that arises from quantum gravity effects which violate all global symmetries. These models therefore require extreme fine-tuning of parameters for consistency. We present a new class of solutions to the quality problem in a unified SO(10) × U(1)a gauge model, where U(1)a is an anomaly free axial gauge symmetry. PQ symmetry emerges as an accidental symmetry in this setup, which admits a PQ breaking scale as large as 4 × 1011 GeV, allowing for the axion to be the cosmological dark matter.  Furthermore, the model has no domain wall problem and it provides a realistic and predictive framework for fermion masses and mixings. 

Organisers:

Gaetano Lambiase (University & INFN Salerno, Italy)

Supratik Pal (PAMU - ISI, Kolkata, India)

Anish Ghoshal (University of Warsaw, Poland)

Arnab Paul (Indian Institute of Technology Madras, India)

Shiladitya Porey (Novosibirsk State University, Russia)

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