103 citations · 360 across the 30 of their papers we have counts for
20 papers · 1 filter
Off-shell equivalence in quantum field theory and gravity
Iberê Kuntz, Stefano Liberati
Field redefinitions connect many formulations of the same physics, but the standard equivalence theorem is an on-shell result and cannot be used to decide when two quantum descript…
The effective field theory of the gravitational functional measure
Henrique Knopki, Iberê Kuntz
The gravitational path integral measure has been the subject of an increasing interest lately, and no conclusive answer yet exists for its correct form. In this paper, we adopt eff…
Transport and response coefficients in second-order dissipative relativistic hydrodynamics with quantum corrections: probing the quark-gluon plasma
I. Kuntz, R. da Rocha
A functional measure encompasses quantum corrections and is explored in the fluid/gravity correspondence. Corrections to response and transport coefficients in the second-order dis…
Constraining the UV with the electroweak effective action
Iberê Kuntz, Amanda Malagi
By considering an arbitrary bare action describing BSM physics, we use the Barvinsky-Vilkovisky resummation to obtain the most general non-local electroweak effective action at sec…
Massive graviton from diffeomorphism invariance
João M. L. de Freitas, Iberê Kuntz
We describe a mechanism in which the graviton acquires a mass from the functional measure without violating the diffeomorphism symmetry nor including Stückelberg fields. Since gaug…
Transport coefficients in AdS/CFT and quantum gravity corrections due to a functional measure
Iberê Kuntz, Roldao da Rocha
The presence of a functional measure is scrutinized on both sides of the dual gauge/gravity correspondence. Corrections to the transport coefficients in relativistic hydrodynamics…
Minimum length (scale) in Quantum Field Theory, Generalized Uncertainty Principle and the non-renormalisability of gravity
Roberto Casadio, Wenbin Feng, Ibere Kuntz +1
The notions of minimum geometrical length and minimum length scale are discussed with reference to correlation functions obtained from in-in and in-out amplitudes in quantum field…
Background independence and field redefinitions in quantum gravity
Roberto Casadio, Alexander Kamenshchik, Iberê Kuntz
It is generally believed that a full-fledged theory of quantum gravity should exhibit background independence and diffeomorphism invariance. In its most general form, the latter co…
Covariant singularities: a brief review
Roberto Casadio, Alexander Kamenshchik, Iberê Kuntz
The Hawking-Penrose theorem is not covariant under field redefinitions. Should the invariance under such transformations be a true principle in Nature, spacetime singularities beco…
Quantum fields in teleparallel gravity: renormalization at one-loop
Roberto Casadio, Iberê Kuntz, Gregorio Paci
We consider the quantization of matter fields in a background described by the teleparallel equivalent to general relativity. The presence of local Lorentz and gauge symmetries giv…
Covariant singularities in Quantum Field Theory and Quantum Gravity
Roberto Casadio, Alexander Kamenshchik, Iberê Kuntz
It is rather well-known that spacetime singularities are not covariant under field redefinitions. A manifestly covariant approach to singularities in classical gravity was proposed…
Revisiting the minimum length in the Schwinger-Keldysh formalism
Roberto Casadio, Iberê Kuntz
The existence of a minimum length in quantum gravity is investigated by computing the in-in expectation value of the proper distance in the Schwinger-Keldysh formalism. No minimum…
Singularity avoidance in quantum gravity
Iberê Kuntz, Roberto Casadio
The purpose of this work is to investigate the consequences of quantum gravity for the singularity problem. We study the higher-derivative terms that invariably appear in any quant…
Exorcising ghosts in quantum gravity
Iberê Kuntz
We remark that Ostrogradsky ghosts in higher-derivative gravity, with a finite number of derivatives, are fictitious as they result from an unjustified truncation performed in a co…
One-loop corrections to in AdS/CFT
Iberê Kuntz, Roldão da Rocha
We study quantum corrections at one-loop order to the shear viscosity to entropy ratio by implementing the Vilkovisky-Barvinsky effective action in asymptotically Anti-de Sitter sp…
GUP black hole remnants in quadratic gravity
Iberê Kuntz, Roldao da Rocha
The Hawking radiation of static, spherically symmetric, asymptotically flat solutions in quadratic gravity, is here explored. The emitted fermions are governed by the Dirac equatio…
Spacetime instability due to quantum gravity
Iberê Kuntz, Roldão da Rocha
We show that quantum gravity yields exponentially growing gravitational waves. Without a mechanism to stop these modes from growing, the universe would go through a gravitational c…
Imprints of Quantum Gravity in the Cosmic Microwave Background
Xavier Calmet, James Edholm, Iberê Kuntz
It has been shown that the spectrum of quantum gravity contains at least two new modes in addition to the massless graviton: a massive spin-0 and a massive spin-2. We calculate the…
Gravitational Waves in Effective Quantum Gravity
Xavier Calmet, Iberê Kuntz, Sonali Mohapatra
In this short paper we investigate quantum gravitational effects on Einstein's equations using effective field theory techniques. We consider the leading order quantum gravitationa…
Higgs Starobinsky Inflation
Xavier Calmet, Iberê Kuntz
In this paper we point out that Starobinky inflation could be induced by quantum effects due to a large non-minimal coupling of the Higgs boson to the Ricci scalar. The Higgs Staro…