103 citations · 360 across the 30 of their papers we have counts for
7 papers · 1 filter
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…
Non-smooth gravity and parity violation
Iberê Kuntz
A conservative extension of general relativity is proposed by alleviating the differentiability of the metric and allowing for non-smooth solutions. We show that these metrics brea…