.The theory group of IFAE (Barcelona, Spain) invites expressions of interest for two postdoctoral research positions in theoretical developments for searches of high frequency gravitational waves in cavities. The positions will start in Fall 2025 and will have a duration of three years.These positions will be funded by the ERC Synergy Grant project GravNet ( A Global Network for the Search for High Frequency Gravitational Waves ). GravNet will be dedicated to optimizing the searches of high-frequency gravitational waves in a network of electromagnetic cavities, or other setups to be conceived during the project. All aspects, from source characterization, response of detectors, network distribution to sensing strategies (in particular leveraging quantum sensing) will be revised, with the goal of building the most precise detector to high frequency gravitational waves in the near future.GravNet is led by PIs Diego Blas (IFAE/ICREA, Barcelona), Dima Budker (U. Mainz), Claudio Gatti (LNF, Italy), and Matthias Schott (U. Bonn, Germany; leading PI). The successful candidates will join the GravNet-IFAE group, in charge of developing and optimizing all theoretical aspects of the proposal. This includes the complete modeling and simulation of the response of the detectors to gravitational waves of different sources, generating realistic sensitivity calculations, and exploring different network configurations. These results will be used to design the best strategy for GravNet to detect high frequency gravitational waves.The candidates should have research expertise in Theoretical Physics, and experience on theoretical work dealing with searches of BSM physics or gravitational waves physics in laboratory setups (in particular with quantum sensing techniques) is particularly welcome. The successful candidate will be part of the Beyond the Standard Model and Astroparticle Physics and Cosmology groups of IFAE.Candidates should include a CV, a statement of research interests, and a publication list (all in PDF format), and 3 Reference Letters to be submitted through the portal.The candidates will be evaluated on the basis of their scientific research excellence and adequacy to the project.The application deadline will be December 31st, 2024. The acceptance deadline for the selected candidates will be set in agreement with the "High-Energy Theory Postdoc Deadline Accord".Sending applications implies the candidate's consent to IFAE to treat their provided personal data according to the current Spanish and European data protection regulations. IFAE is an equal opportunity employer committed to diversity in the workplace and social integration of people with a disability. We welcome applications from all qualified candidates. People from groups that are typically underrepresented in the labour market in general, and in Science and Engineering in particular, such as women, minorities, or people with a disability, are particularly encouraged to apply