Topic: general relativity

Connect numerical approaches to classical and quantum initial-boundary-value problems. The workshop examines deterministic wave propagation, fluid dynamics and general relativity alongside fluctuating quantum fields and hydrodynamics. Invited perspectives and contributed talks explore shared modelling challenges, including symmetry-preserving and mimetic discretisation, summation-by-parts methods, action-based formulations, lattice field theory, stochastic partial differential equations and quantum computing. Researchers in theoretical physics and applied mathematics will compare methods and i

Study modern connections between gravitational theory and quantum information in an intensive doctoral school for young researchers. Lectures develop covariant phase space, boundary symmetries and edge modes in general relativity, then connect these tools to observable algebras, celestial holography and quantum reference frames. Leading researchers introduce the foundations and discuss current research directions at the interface of classical and quantum gravity. 11 April 2027 at 15:00 through 16 April at 17:00, Europe/Zurich (CEST, UTC+2). Participants must attend the full week. Preregistrat

Vitor Cardoso discusses how observations and theory are changing black-hole physics. The conversation covers Hawking radiation, general relativity, gravitational-wave observations and the Event Horizon Telescope, asking what these measurements reveal about black holes and what future observatories could test.

Giada Santoro examines strong-field gravity and compact-object structure using GW250114, a gravitational-wave event with signal-to-noise ratio around eighty. The unusually strong signal supports precise tests of departures from general relativity and detailed measurements of black-hole ringdown. No tidal deformability is detected: the analysis places a ninety-percent upper bound of 34.8 on the effective tidal-deformability parameter. This is consistent with the vanishing tidal response predicted for Kerr black holes.

Yang-Hui He joins Steven Strogatz to trace geometry from ancient measurement and Euclid to curved spaces, general relativity, and string theory. They discuss why geometry provides a shared language for mathematics and physics, how rigorous proof interacts with physical intuition, and how artificial intelligence might change mathematical discovery. The conversation also contrasts broad conceptual views with concentrated work on individual problems.

Eric Gourgoulhon introduces black holes within general relativity and reviews their defining physical properties. The seminar then compares electromagnetic observations, including images near black-hole boundaries, with gravitational-wave measurements of their dynamics. Together, these approaches create new tests of relativistic gravity.

How can black holes be established both as a consequence of gravitational theory and as objects in the sky? Roger Penrose examines the mathematical development of gravitational collapse and space-time singularities, explaining why black-hole formation does not depend on perfectly symmetric idealisations. Reinhard Genzel and Andrea Ghez trace the observational effort to establish a massive compact object at the centre of the Milky Way. Their accounts connect infrared observations, improvements in imaging through atmospheric distortion, and long-term measurements of stellar motions around Sagitt

Øyvind Grøn discusses Einstein's life and the development of special and general relativity in the first of two related conversations. In Norwegian.