Description
Miguel Zumalacárregui
Gravitational lensing of waves: a new window into astrophysics, dark matter & gravity
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Dr Zumalacarregui, Miguel (Max Planck Institute for Gravitational Physics - Albert Einstein Institut)25/05/2026, 09:30
Just like light, gravitational waves (GWs) are gravitationally lensed by massive objects in the Universe. Moreover, their low frequency, phase coherence, and lack of absorption make GWs complementary to lensed electromagnetic sources. In addition to gravitational magnification and the formation of multiple images, lensed GWs exhibit genuine wave-propagation effects such as diffraction, that...
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Andric, Tomislav (Gran Sasso Science Institute)25/05/2026, 15:30
The Einstein Telescope (ET) is a proposed third-generation ground-based gravitational-wave observatory designed to extend the sensitivity of current detectors by an order of magnitude and to access frequencies down to a few hertz. This improvement will dramatically increase the observable volume of the Universe and enable precision studies of compact-object populations, cosmology, and...
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Hennigar, Robie26/05/2026, 09:30
Regular, singularity-free black holes have been studied for more than sixty years as a possible resolution of the black hole singularity problem. Progress in this direction, however, has been limited by the lack of a robust dynamical mechanism for their formation. I will argue that, if regular black holes are relevant to the ultimate resolution of spacetime singularities, they are most likely...
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Olivares, Hector (Universidade de Aveiro)26/05/2026, 15:30
Extensions of general relativity and of the Standard Model of particle physics predict the existence of exotic compact objects (ECOs) that can achieve compactness high enough to mimic black holes. For the first time, advances in observational techniques such as very-long-baseline interferometry (VLBI) allow us to probe supermassive black hole candidates at high spatial resolution and test some...
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Aresté Saló, Llibert27/05/2026, 15:30
I present the first numerical simulations of binary black holes and binary neutron star mergers in scalar–Gauss–Bonnet gravity performed in the modified puncture gauge, which is a well-motivated theory from an effective field theory point of view. Implemented within both GRChombo and MHDuet Numerical Relativity codes, our modified formulation enables stable evolution through merger and...
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Prof. Sakellariadou, Maria (King's College Londom)28/05/2026, 09:30
I will summarise the results of the LIGO-Virgo-KAGRA paper arXiv:2510.26848 [gr-qc]
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In this paper we derive gravitational-wave background energy density upper limits from the O1-O4a data to constrain parameters associated with various possible processes in the early Universe: first-order phase transitions, cosmic strings, domain walls, stiff equation of state, axion inflation, second-order... -
Gadioux, Maxime (University of Cambridge)29/05/2026, 09:30
A few years ago, Kehle and Unger proved that, by sending finely-tuned pulses of a charged scalar field into a black hole, it is possible to form an extremal Reissner-Nordström black hole in finite time, i.e. the third law is false. The proof makes use of characteristic gluing: a framework to build solutions to Einstein's equations by gluing two regions of spacetime along a null cone. In this...
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