HEP2026: 42nd Conference on Recent Developments in High Energy Physics and Cosmology [NTUA] Jul 8 – 11, 2026

Detection of Gravitons by Excess of Photon Luminosities from Interstellar and Intergalactic Hydrogen

Not scheduled

20m

Main Hall (Level 1) (National Technical University of Athens)

Astroparticle and rare event searches

Speaker

Prof. Georgios Savvidis (Nat. Cent. for Sci. Res. Demokritos (GR))

Description

We are interested in finding out a workable method for an experimental detection of gravitons by investigating their interaction with hydrogen atoms that are widespread in large clouds throughout the vast interstellar space of a typical spiral galaxy and with the giant halos of pristine, primordial hydrogen gas that surrounded galaxies in the early universe at z = 5.5 - 13.4. The presence of copious amount of primordial hydrogen gas was discovered by the spectroscopic observations with the JWST. We compute the graviton absorption and emission rates by hydrogen atoms in line with the results obtained by Weinberg, Gould, Dyson and other authors. The detection feasibility depends on the graviton luminosity of stars and the absorption rate of gravitons by the ISM and IGM. The graviton luminosity of Sun, or a typical star, is induced by the scattering of electrons and protons in a completely ionised hydrogen plasma at the core of the Sun and their energies are in the eV to keV range. We suggest measuring the excess in the ratio of photon luminosities from hydrogen atoms that is induced due to the absorption of gravitons. The excess in the ratio of photon luminosities would indicate the presence of gravitons.

arXiv:2605.11278