Nobel Prize-winning physicist Professor Takaaki Kajita served as the chief guest at Tribhuvan University's 51st Convocation Ceremony on December 25, 2025, in Kathmandu. The event marked the graduation of over 16,380 students, with Kajita delivering an address that emphasized the importance of persistent research in uncovering the universe's mysteries. This was the first time a Nobel laureate had been invited as chief guest to the university's convocation, drawing widespread attention and highlighting Tribhuvan's growing international stature.

Professor Takaaki Kajita, a renowned Japanese physicist from the University of Tokyo, was awarded the Nobel Prize in Physics in 2015 for his groundbreaking discovery of neutrino oscillations, which demonstrated that neutrinos have mass and challenged existing particle physics models. His work at the Super-Kamiokande underground observatory has revolutionized our understanding of subatomic particles and their role in the cosmos. Kajita's career spans decades of dedication to experimental physics, making him a global icon in the field of astrophysics and cosmology.

During the convocation, Kajita congratulated the graduates and shared insights from his own journey, noting that his success stemmed from unwavering commitment to research even after formal education. The ceremony also saw medals awarded to top-performing students, with around 90,000 total graduates across various programs. University officials hailed the event as a milestone, fostering inspiration among Nepal's youth to pursue scientific endeavors amid the country's evolving educational landscape.

Following the convocation, on December 26, 2025, Kajita delivered a special lecture at the Central Department of Physics titled "Studying the Universe from Underground Neutrinos and Gravitational Waves." In the talk, he explored how underground detectors like Super-Kamiokande capture elusive neutrinos from cosmic events and how gravitational wave observations, such as those from LIGO, complement these studies to reveal the universe's hidden dynamics. Attendees described the session as enlightening, bridging particle physics with broader astronomical phenomena.

The visit has renewed interest in physics research in Nepal, with experts calling it a catalyst for international collaborations. Kajita's presence not only honored the graduates but also underscored the global relevance of neutrino and gravitational wave studies in addressing fundamental questions about the universe's origins and evolution. As Tribhuvan University looks ahead, such high-profile engagements are expected to elevate its role in fostering scientific innovation in South Asia.