2,432 research outputs found
(De)coupling Limit of DGP
We investigate the decoupling limit in the DGP model of gravity by studying
its nonlinear equations of motion. We show that, unlike 4D massive gravity, the
limiting theory does not reduce to a sigma model of a single scalar field:
Non-linear mixing terms of the scalar with a tensor also survive. Because of
these terms physics of DGP is different from that of the scalar sigma model. We
show that the static spherically-symmetric solution of the scalar model found
in hep-th/0404159, is not a solution of the full set of nonlinear equations. As
a consequence of this, the interesting result on hidden superluminality
uncovered recently in the scalar model in hep-th/0602178, is not applicable to
the DGP model of gravity. While the sigma model violates positivity constraints
imposed by analyticity and the Froissart bound, the latter cannot be applied
here because of the long-range tensor interactions that survive in the
decoupling limit. We discuss further the properties of the Schwarzschild
solution that exhibits the gravitational mass-screening phenomenon.Comment: 14 pages; v2: typos corrected, footnote added, to apppear in PL
Non-perturbative Unitarity of Gravitational Higgs Mechanism
In this paper we discuss massive gravity in Minkowski space via gravitational
Higgs mechanism, which provides a non-perturbative definition thereof. Using
this non-perturbative definition, we address the issue of unitarity by studying
the full nonlinear Hamiltonian for the relevant metric degrees of freedom.
While perturbatively unitarity is not evident, we argue that no negative norm
state is present in the full nonlinear theory.Comment: 15 pages, Phys. Rev. D versio
Diluting solutions of the cosmological constant problem
We discuss the cosmological constant problem in the context of higher
codimension brane world scenarios with infinite-volume extra dimensions.Comment: 11 pages, Revtex, reference adde
Toward Solving the Cosmological Constant Problem?
We discuss the cosmological constant problem in the context of higher
codimension brane world scenarios with infinite-volume extra dimensions. In
particular, by adding higher curvature terms in the bulk action we are able to
find smooth solutions with the property that the 4-dimensional part of the
brane world-volume is flat for a range of positive values of the brane tension.Comment: 45 pages, revtex, 8 eps figure
Gravity on a 3-brane in 6D Bulk
We study gravity in codimension-2 brane world scenarios with infinite volume
extra dimensions. In particular, we consider the case where the brane has
non-zero tension. The extra space then is a two-dimensional ``wedge'' with a
deficit angle. In such backgrounds we can effectively have the Einstein-Hilbert
term on the brane at the classical level if we include higher curvature
(Gauss-Bonnet) terms in the bulk. Alternatively, such a term would be generated
at the quantum level if the brane matter is not conformal. We study
(linearized) gravity in the presence of the Einstein-Hilbert term on the brane
in such backgrounds. We find that, just as in the original codimension-2
Dvali-Gabadadze model with a tensionless brane, gravity is almost completely
localized on the brane with ultra-light modes penetrating into the bulk.Comment: 16 pages, revtex; references added (to appear in Phys. Lett. B
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