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Weakly-Coupled Trace Anomaly Action for Gravity
Gregory Gabadadze, Giorgi Tukhashvili
We discuss a local, diff-invariant quantum effective action for gravity that captures the trace anomaly via a counter-term. We discuss why this counter-term is the most significant…
Inflation with the Trace Anomaly Action and Primordial Black Holes
Gregory Gabadadze, David N. Spergel, Giorgi Tukhashvili
We study inflation in a recently proposed gravitational effective field theory describing the trace anomaly. The theory requires an additional scalar which is massless in the early…
Holography for the Trace Anomaly Action
Gregory Gabadadze, Massimo Porrati
A recently proposed effective action for the trace anomaly describes a tensor-scalar theory that is weakly coupled up to a certain high energy scale, where it becomes strongly inte…
A New Gravitational Action For The Trace Anomaly
Gregory Gabadadze
The question of building a local diff-invariant effective gravitational action for the trace anomaly is reconsidered. General Relativity (GR) combined with the existing action for…
Continuity, Localization, and Cosmology in Warped Geometry
Gregory Gabadadze, Daniel Older, David Pirtskhalava
This is the first of two papers studying localization of massive bulk fields on a bane in 5D anti-de Sitter spacetime, and some of their cosmological consequences. Here we focus on…
The Chern-Simons Caps for Rotating Black Holes
Stephon Alexander, Gregory Gabadadze, Leah Jenks +1
We study the dynamical Chern-Simons gravity as an effective quantum field theory, and discuss a broad range of its parameter space where the theory is valid. Within that validity r…
Conformal/Poincaré Coset, Cosmology, and Descendants of Lovelock Terms
Gregory Gabadadze, Giorgi Tukhashvili
We calculate six invariant terms of a gravitational field theory that nonlinearly realizes the Conformal/Poincaré quotient, and reduce to the known conformal Galileons in the limit…
Resolving the vDVZ and Strong Coupling Problems in Massive Gravity and Bigravity
Gregory Gabadadze, Daniel Older, David Pirtskhalava
As is well known, both massive gravity and bigravity exhibit the linear van Dam-Veltman-Zakharov (vDVZ) discontinuity that is cured classically by the nonlinear Vainshtein mechanis…
Gravitational Dressing of 3D Conformal Galileon
Gregory Gabadadze, Giorgi Tukhashvili
Could a conformal Galileon be describing a gauge mode of a broader diffeomorphism invariant theory? We answer this question affirmatively in 3D by using a coset construction for a…
Boundary Terms for Massive General Relativity
Gregory Gabadadze, David Pirtskhalava
It is well-known that the presence of a spacetime boundary requires the conventional Einstein-Hilbert (EH) action to be supplemented by the Gibbons-Hawking (GH) boundary term in or…
Holographic CBK Relation
Gregory Gabadadze, Giorgi Tukhashvili
The Crewther-Broadhurst-Kataev (CBK) relation connects the Bjorken function for deep-inelastic sum rules (or the Gross - Llewellyn Smith function) with the Adler function for elect…
Medium Generated Gap in Gravity and a 3d Gauge Theory
Gregory Gabadadze, Daniel Older
It is well known that a physical medium that sets a Lorentz frame generates a Lorentz-breaking gap for a graviton. We examine such generated "mass" terms in the presence of a fluid…
A Scale-up of Lambda_3
Gregory Gabadadze
Pure massive gravity is strongly coupled at a certain low scale, known as Lambda_3. I show that the theory can be embedded into another one, with new light degrees of freedom, to i…
Dark Energy and Inflation with Volume Normalized Action
Gregory Gabadadze, Siqing Yu
In the theories described by a volume normalized action functional, an arbitrary cosmological constant is eliminated from the physical picture of our Universe, and dynamical altern…
Nonlocal Galileons and Self-Acceleration
Gregory Gabadadze, Siqing Yu
A certain class of nonlocal theories eliminates an arbitrary cosmological constant (CC) from a universe that can be perceived as our world. Dark energy then cannot be explained by…
Metamorphosis of the Cosmological Constant and 5D Origin of the Fiducial Metric
Gregory Gabadadze, Siqing Yu
In a recently proposed theory, the cosmological constant (CC) does not curve spacetime in our universe, but instead gets absorbed into another universe endowed with its own dynamic…
Unparticles as the Holographic Dual of Gapped AdS Gravity
Sophia K. Domokos, Gregory Gabadadze
Naively applying holographic duality to gapped gravity on Anti de Sitter (AdS) space seems to suggest that the stress tensor of the field theory dual cannot be conserved. On the ot…
Vainshtein Solutions Without Superluminal Modes
Gregory Gabadadze, Rampei Kimura, David Pirtskhalava
The Vainshtein mechanism suppresses the fifth force at astrophysical distances, while enabling it to compete with gravity at cosmological scales. Typically, Vainshtein solutions ex…
The Big Constant Out, The Small Constant In
Gregory Gabadadze
Some time ago, Tseytlin has made an original and unusual proposal for an action that eliminates an arbitrary cosmological constant. The form of the proposed action, however, is str…
Selfacceleration with Quasidilaton
Gregory Gabadadze, Rampei Kimura, David Pirtskhalava
Quasidilaton massive gravity is an extension of massive General Relativity to a theory with additional scale invariance and approximate internal Galilean symmetry. The theory has a…
On the Potential for General Relativity and its Geometry
Gregory Gabadadze, Kurt Hinterbichler, David Pirtskhalava +1
The unique ghost-free mass and nonlinear potential terms for general relativity are presented in a diffeomorphism and local Lorentz invariant vierbein formalism. This construction…
Mixed Galileons and Spherically Symmetric Solutions
L. Berezhiani, G. Chkareuli, C. de Rham +2
It was previously found that in a certain parameter subspace of scalar-tensor theories emerging from massive gravity, the only stable field configuration created by static spherica…
On Cosmological Perturbations of Quasidilaton
Guido D'Amico, Gregory Gabadadze, Lam Hui +1
A theory of the quasidilaton is an extension of massive gravity by a scalar field, nonlinearly realizing a certain new global symmetry of the Lagrangian. It has been shown that unl…
Restricted Galileons
Lasha Berezhiani, Giga Chkareuli, Gregory Gabadadze
We study Galileon theories that emerge in ghost-free massive gravity. In particular, we focus on a sub-class of these theories where the Galileons can be completely decoupled from…