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The Poisson boundary of discrete subgroups of semisimple Lie groups without moment conditions
Kunal Chawla, Behrang Forghani, Joshua Frisch, Giulio Tiozzo
https://arxiv.org/abs/2509.02500

The Poisson boundary of discrete subgroups of semisimple Lie groups without moment conditions
We show that the Poisson boundary of random walks of finite entropy on Zariski-dense discrete subgroups of semisimple Lie groups equals the Furstenberg boundary of the corresponding symmetric spaces equipped with the hitting measure, without assuming any moment condition on the random walk.

Enhanced Gravitational Effects of Radiation and Cosmological Implications
Hemza Azri, Kemal G\"ultekin, Adrian K. E. Tee
https://arxiv.org/abs/2509.17384 https://

Enhanced Gravitational Effects of Radiation and Cosmological Implications
In the momentarily comoving frame of a cosmological fluid, the determinant of the energy-momentum tensor (EMT) is highly sensitive to its pressure. This component is significant during radiation-dominated epochs, and becomes naturally negligible as the universe transitions to the matter-dominated era. Here, we investigate the cosmological consequences of gravity sourced by the determinant of the EMT. Unlike Azri and Nasri, Phys. Lett. B 836, 137626 (2023), we consider the most general case in w…

Valley-dependent emission patterns enabled by plasmonic nanoantennas
Tobias Bucher, Jingshi Yan, Jan Sperrhake, Zlata Fedorova, Mostafa Abasifard, Rajeshkumar Mupparapu, Haitao Chen, Emad Najafidehaghani, Khosro Zangeneh Kamali, Antony George, Mohsen Rahmani, Thomas Pertsch, Andrey Turchanin, Dragomir N. Neshev, Isabelle Staude
https://arx…

Valley-dependent emission patterns enabled by plasmonic nanoantennas
Selective control over the emission pattern of valley-polarized excitons in monolayer transition metal dichalcogenides is crucial for developing novel valleytronic, quantum information, and optoelectronic devices. While significant progress has been made in directionally routing photoluminescence from these materials, key challenges remain: notably, how to link routing effects to the degree of valley polarization, and how to distinguish genuine valley-dependent routing from spin-momentum coupli…