1 research outputs found
Higher Curvature Quantum Gravity and Large Extra Dimensions
We discuss effective interactions among brane matter induced by modifications
of higher dimensional Einstein gravity via the replacement of Einstein-Hilbert
term with a generic function f(R) of the curvature scalar R. After deriving the
graviton propagator, we analyze impact of virtual graviton exchanges on
particle interactions, and conclude that f(R) gravity effects are best probed
by high-energy processes involving massive gauge bosons, heavy fermions or the
Higgs boson. We perform a comparative analysis of the predictions of f(R)
gravity and of Arkani-Hamed-Dvali-Dimopoulos (ADD) scenario, and find that the
former competes with the latter when f''(0) is positive and comparable to the
fundamental scale of gravity in higher dimensions. In addition, we briefly
discuss graviton emission from the brane as well as its decays into
brane-localized matter, and find that they hardly compete with the ADD
expectations. Possible existence of higher-curvature gravitational interactions
in large extra spatial dimensions opens up various signatures to be confronted
with existing and future collider experiments.Comment: 19 pp, 2 figs. Added references, corrected typo