Speaker
Mr
Julio Leite
(King's College London)
Description
We consider "classical" fermions and scalars coupled to a 4-d diffeomorphism breaking gravity
model, and we derive the one-loop Lorentz-violating effective dispersion relation for matter,
after integrating out gravitons. The modified gravity model is the z=3 non-projectable
Horava-Lifshitz gravity which, due to its improved UV behaviour, involves logarithmic divergences only. We find that with generic values for the different parameters, the model leads to $10^{10}$ GeV as the typical scale above which the current upper bounds on Lorentz violation can no longer be satisfied. On the other hand, it is always possible to fine-tune the parameters of the model, such that the effective maximum speed seen by particles is consistent with Special Relativity.
Primary author
Mr
Julio Leite
(King's College London)
