We expect to open several postdoctoral positions to work in the gravity theory and gravitational-wave phenomenology group at Sapienza University of Rome https://web.uniroma1.it/gmunu . Successful candidates will join the FIS project 'ET-NOW: Fundamental Physics, Nuclear Physics, and Cosmology with the Einstein Telescope' (PI: Paolo Pani) recently funded by the Italian Ministry for Research. Candidates with expertise in gravitational-wave modeling, numerical relativity, science interpretation and data analysis, and with interests in cosmology, nuclear, high-energy physics & gravity are particularly encouraged to apply. The appointment is for 21 years (extension subject to funding renewal and satisfactory performance), with a net salary competitive with international standards. All candidates must hold (or soon be completing) a Ph.D. in Physics. Although flexible, the positions are expected to start typically in Sep 2025; but earlier start dates (as early as March 2025) can also be considered. Screening of the applications will begin in late December 2024 and will continue until the positions are filled. Expressions of interest can be submitted here: https://forms.gle/mGWkr3Cm6KDzktPn8 The research activities of the gmunu group include gravitational-wave modeling and phenomenology, black-hole and neutron-star physics, tests of gravity and of the nature of compact objects, and strong-gravity searches for dark matter. Group members are also expected to get involved in other activities such as training of students, networking, workshop & meeting organization, etc. The gmunu group currently includes the PI, Prof. Paolo Pani, 6 postdocs and 5 PhD students. Successful candidates will directly collaborate also with Prof. Francesco Pannarale (GW modelling and data analysis), Prof. Alfredo Urbano (Beyond the standard model theory and phenomenology; cosmology and physics of the primordial universe), and their students. Project members are also expected to interact with the ET experimental and GW data-analysis group https://web.infn.it/VirgoRoma/index.php/en/ and with the INFN Rome Theory group https://theory.roma1.infn.it/ at Sapienza, and to actively take part of the activities of the ET Observational Science Board. The Department of Physics at Sapienza is a vibrant work environment which hosts renowned research groups in several areas of physics, including gravitational-wave science, cosmology, and high-energy physics. In 2024 it ranked 12th among all Physics Departments worldwide and first in Italy, according to the Shanghai Global Ranking. J-18808-Ljbffr