Colloquium on May. 24, 2023

Gravtion-Photon Conversion in Atoms and the Detection of Gravtions

Speaker:Gui-Rong Liang (South University of Science and Technology)

Venue:SWIFAR Building 2111

Time:15:00 PM, Wednesday, May. 24, 2023

Abstract:

Graviton-Photon conversion (GRAPH) is an important method to detect high-frequency gravitational waves (HFGW), the basic formalism and applications will be introduced in this talk. From graviton to photon conversion (G to P), I will present key features of GRAPH in a static transverse background of electric or magnetic field; then I will derive the cross section of graviton-atom interaction in a background of spherical electric field, the results makes it possible to catch MeV level graviton from the universe with current or upgraded neutrino facilities; I will also talk about corresponding astrophysical sources and the limitation on their properties. From photon to graviton conversion (P to G), I will introduce an experiment using entangled photon pairs with one beam of them passing through a magnetic tunnel, to examine the energy quantization of gravitational field by counting missing photons. Finally we will discuss and give some prospects of the topic.