Plasma graviton production in TeV-scale gravity

TL;DR

This paper develops a theoretical framework for plasma interactions with Kaluza-Klein gravitons in TeV-scale gravity models, revealing collective emission channels that could impact astrophysical graviton production estimates.

Contribution

It introduces a kinetic plasma model interacting with multidimensional gravitons and identifies new collective emission mechanisms beyond known processes.

Findings

Collective plasma effects significantly influence KK graviton emission rates.

New channels like plasma wave coalescence into gravitons are identified.

Production rates in astrophysical objects may be underestimated using previous models.

Abstract

We develop the theory of interaction of classical plasma with Kaluza-Klein (KK) gravitons in the ADD model of TeV-scale gravity. Plasma is described within the kinetic approach as the system of charged particles and Maxwell field both confined on the brane. Interaction with multidimensional gravity living in the bulk with $n$ compact extra dimensions is introduced within the linearized theory. The KK gravitons emission rates are computed taking into account plasma collective effects through the two-point correlation functions of the fluctuations of the plasma energy-momentum tensor. Apart from known mechanisms (such as bremsstrahlung and gravi-Primakoff effect) we find essentially collective channels such as the coalescence of plasma waves into gravitons which may be manifest in turbulent plasmas. Our results indicate that commonly used rates of the KK gravitons production in stars and supernovae may be underestimated.