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In this note, we discuss the prospect of accurate measurements of cosmic microwave background (CMB) polarization rotation with future surveys. We focus on instrumental issues, analyzing the required improvements in detection methods and calibration procedures, and discuss the impact of these requirements in the design and optimization of forthcoming CMB polarimeters.

The High Energy cosmic-Radiation Detection (HERD) space mission is now being designed, as a result of an international collaboration among several chinese and european institutions, to make cosmic ray (CR) direct measurements at the highest possible energies with current technologies.

HERD primary scientific goals include precise measurements of the energy spectra of CR individual species up to few PeV, reaching the knee of the all-particle spectrum, and study electrons and photon of spectra from GeV up to tens of TeV, also contributing to multimessenger observations together with other satellites and ground-based experiments.

In order to reach these goals HERD is configured to accept incident particles from its top and the four lateral sides. The baseline design includes covering the top and fours sides with: the Silicon Charge Detector (SCD), for incident particle trajectory and charge measurement, the Plastic Scintil- lator Detector (PSD), for photon tagging and precise charge measurement, and a scintillating Fiber Tracker (FIT). The core of the facility is made by a LYSO crystal calorimeter (CALO) that with its 3 interaction lengths and 55 radiation lengths will allow the measurement of incident gamma-rays, electrons and cosmic ray nuclei with unprecedented resolution and 3D reconstruction. In addition, on one side a Transition Radiation detector (TRD) will be installed for on-orbit calibration of the CALO.

The importance of Astrometry as a powerful technique for accurate tests of gravity theories has constantly grown during the last years. Usually these tests are formulated in the framework of the PPN formalism. We provide a short review of the forthcoming experimental scenario, and suggest how its results can be reformulated and interpreted in the context of the Extended Theories of Gravity.

The Gravitation Astrometric Measurement Experiment (GAME) is a mission concept based on astrometric and coronagraphy techniques whose main scientific goal is the estimation of the γ and β parameters of the PPN formalism. The science case also addresses cosmology, extra-solar planets, Solar System objects and fundamental stellar parameters. We briefly describe the motivations of the mission, its measurement approach and instrument design, providing an estimation of the expected results.