18 citations · 49 across the 13 of their papers we have counts for
13 papers
On the analogue of Einstein-Gauss-Bonnet theory in 3+1 dimensions
Giorgi Tukhashvili
Higher curvature corrections to the Einstein-Hilbert term may play an important role in probing the strong-field regime of gravity. In this letter, we demonstrate that the local ef…
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…
Torsion, Gravity Induced Chiral Symmetry Breaking and Cosmological Bounce
Giorgi Tukhashvili
In this paper, we elaborate and extend our proposal arXiv:2307.16098 of the cosmological bouncing model in which a chiral condensate violates the null energy condition and induces…
Cosmological Bounces Induced by a Fermion Condensate
Giorgi Tukhashvili, Paul J. Steinhardt
We show that it is possible for fermion condensation of the Nambu-Jona-Lasinio type to induce a non-singular bounce that smoothly connects a phase of slow contraction to a phase of…
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…
Unitarity and Different Phases of the Extended New Massive Gravity
Giorgi Tukhashvili
We study the New Massive Gravity extended by the curvature cubed invariant and the Cosmological Constant using the tree-level scattering amplitudes on a maximally symmetric space-t…
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…
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…
Possible Derivative Interactions in Massive bi-Gravity
Giorgi Tukhashvili
Using the metric formalism, we study the derivative mixings of spin-2 fields in massive bi-Gravity. Necessary (but not sufficient) criteria are given for such mixings to be ghost f…
New Class of N-dimensional Braneworlds
Merab Gogberashvili, Pavle Midodashvili, Giorgi Tukhashvili
The new class of the non-stationary solutions to the system of N-dimensional equations for coupled gravitational and massless scalar field is found. The model represents a single (…
Hierarchy of Fermion Masses in the 5D Standing Wave Braneworld
Merab Gogberashvili, Giorgi Tukhashvili
The localization problem for massive fermions in the 5D standing wave braneworld is considered. The fermion generations on the brane are explained by the existence of three nodes o…
Numerical Solutions in 5D Standing Wave Braneworld
Merab Gogberashvili, Otari Sakhelashvili, Giorgi Tukhashvili
Within the 5D standing wave braneworld model numerical solutions of the equations for matter fields with various spins are found. It is shown that corresponding action integrals ar…