Publications by authors named "Y Clenet"
Tight relationships exist in the local Universe between the central stellar properties of galaxies and the mass of their supermassive black hole (SMBH). These suggest that galaxies and black holes co-evolve, with the main regulation mechanism being energetic feedback from accretion onto the black hole during its quasar phase. A crucial question is how the relationship between black holes and galaxies evolves with time; a key epoch to examine this relationship is at the peaks of star formation and black hole growth 8-12 billion years ago (redshifts 1-3).
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- The star S2, orbiting the black hole Sagittarius A*, undergoes notable changes in gravitational potential, which researchers use to test the local position invariance (LPI) part of the Einstein equivalence principle.
- By analyzing the redshift of hydrogen and helium absorption lines in the star's spectrum during its closest approach to the black hole, the study aims to establish an upper limit on LPI violations.
- The research findings suggest that the tested gravitational potential variation is six times greater than what can be measured on Earth and ten times larger than previous experiments with white dwarfs, marking a new testing regime for the LPI.
The adaptive optics system for the second-generation VLT-interferometer (VLTI) instrument GRAVITY consists of a novel cryogenic near-infrared wavefront sensor to be installed at each of the four unit telescopes of the Very Large Telescope (VLT). Feeding the GRAVITY wavefront sensor with light in the 1.4 to 2.
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