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Dr Minyuan Jiang (Nanjing Normal University)20/04/2026, 13:30
We derive the shockwave metric in four-dimensional Einstein--Maxwell effective field theory (EFT) by performing an ultra-relativistic boost of the charged black hole solution accompanied by a rescaling of its mass and charge, including leading order EFT corrections. In contrast to the neutral (Schwarzschild) case, where higher derivative operators leave the shockwave geometry unchanged, we...
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jinlei yang (Hebei University)20/04/2026, 13:55
The hierarchy problem between the electroweak (EW) scale and the Planck scale remains a central puzzle in modern physics. A promising approach is the cosmological selection via volume-weighted dynamics in a multiverse landscape, where the EW scale is dynamically selected as the configuration that maximizes the vacuum energy. We propose a two-step cosmological selection (TCS) mechanism. By...
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Yi-Song Lu20/04/2026, 14:20
Domain walls arise in various physical contexts, such as early universe phase transitions. Their interaction with the surrounding plasma determines their motion and the scaling behavior of the networks. We study the friction exerted by a thermal plasma on domain walls in the thin-wall regime using the ballistic approximation. The resulting friction, dependent on wall velocity and temperature,...
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