We systematically study the most general Lorentz-violating graviton mass invariant under three-dimensional Eucledian group using the explicitly covariant language. We find that at general values ofâ€¦ (More)

We study the effect of spontaneous breaking of Lorentz invariance on black hole thermodynamics. We consider a scenario where Lorentz symmetry breaking manifests itself by the difference of maximalâ€¦ (More)

We discuss whether electric charge conservation may not hold in four-dimensional world in models with infinite extra dimensions, i.e., whether escape of charged particles from our brane is consistentâ€¦ (More)

We consider the infrared modification of gravity by ghost condensate. Naively, in this scenario one expects sizeable modification of gravity at distances of order 1000 km, provided that theâ€¦ (More)

We consider a class of models with infinite extra dimension, where bulk space does not possess SO(1, 3) invariance, but Lorentz invariance emerges as an approximate symmetry of the low-energyâ€¦ (More)

Recently it was proposed that matching of global charges induced in vacuum by slowly varying, topologically non-trivial scalar fields provides consistency conditions analogous to the â€™t Hooft anomalyâ€¦ (More)

We calculate the cosmic microwave background (CMB) anisotropy spectrum in models with millicharged particles of electric charge q âˆ¼ 10âˆ’6âˆ’ 10âˆ’1 in units of electron charge. We find that a large regionâ€¦ (More)

Brane-induced gravity in more than one extra dimensions: violation of equivalence principle and ghost. Abstract We consider brane-induced gravity model in more than one extra dimensions, reg-ularizedâ€¦ (More)

We argue that any viable mechanism of gauge field localization should automatically imply charge universality on the brane. We study whether this condition is satisfied in the two known proposalsâ€¦ (More)

In a brane (domain wall) scenario with an infinite extra dimension and localized gravity, bulk fermions and scalars often have bound states with zero 4-dimensional mass. In this way massless matterâ€¦ (More)