70 citations · 140 across the 11 of their papers we have counts for
12 papers
Palatini inflationary (non-)attractors: Universal mapping of observables
Christian Dioguardi, Francesco Gianesello, Antonio Racioppi
We study single-field slow-roll inflation in the context of Palatini gravity for the class of non-minimally coupled -attractors, i.e.,\ models where the same function fix…
Inflation with Nieh-Yan-like terms in metric-affine gravity
Ilaria Andrei, Christian Dioguardi, Damianos Iosifidis +3
We study single-field slow-roll inflation in metric-affine gravity with a scalar field non-minimally coupled to the non-Riemannian Ricci scalar and to the divergences of the torsio…
Quasi-pole quintessential inflation in metric-affine gravity
Konstantinos Dimopoulos, Christian Dioguardi, Ioannis D. Gialamas +1
We study quintessential inflation in the framework of metric-affine gravity. It is well known that non-minimal couplings with the Holst invariant can generate a quasi-pole inflatio…
Natural inflation in Palatini
N. Bostan, R. H. Dejrah, C. Dioguardi +1
Palatini gravity provides a robust framework for constructing viable inflationary potentials. In this study, we examine natural inflation and show that its consistency with…
Palatini Linear Attractors Are Back in ACTion
Christian Dioguardi, Alexandros Karam
Recent results from the Atacama Cosmology Telescope (ACT) indicate a scalar spectral index , in excellent agreement with the prediction of linear inflation. Howe…
Fractional attractors in light of the latest ACT observations
Christian Dioguardi, Antonio J. Iovino, Antonio Racioppi
In light of the latest results from ACT observations we review a class of potentials labeled as fractional attractors, that can originate from Palatini gravity. We show that, for c…
Quintessential Inflation in Palatini gravity
Konstantinos Dimopoulos, Christian Dioguardi, Gert Hütsi +1
Palatini gravity, with the inflaton kinetic term, proved to be a powerful framework for generating asymptotically flat inflaton potentials. Here we show that a quadrat…
Natural inflation in Palatini
N. Bostan, R. H. Dejrah, C. Dioguardi +1
In the context of Palatini gravity, models, with X the inflaton kinetic term, are characterized by the appealing property of generating asymptotically flat inflaton potent…
Palatini : a new framework for inflationary attractors
Christian Dioguardi, Antonio Racioppi
Palatini gravity proved to be a powerful tool in order to realize asymptotically flat inflaton potentials. Unfortunately, it also inevitably implies higher-order inflaton ki…
Beyond (and back to) Palatini quadratic gravity and inflation
Christian Dioguardi, Antonio Racioppi, Eemeli Tomberg
We study single-field slow-roll inflation embedded in Palatini gravity where grows faster than . Surprisingly, the consistency of the theory requires the Jordan…
Slow-roll inflation in Palatini gravity
Christian Dioguardi, Antonio Racioppi, Eemeli Tomberg
We study single field slow-roll inflation in the presence of gravity in the Palatini formulation. In contrast to metric , when rewritten in terms of an auxiliary field…
A note on the linear stability of black holes in quadratic gravity
Christian Dioguardi, Massimiliano Rinaldi
Black holes in -gravity are known to be unstable, especially the rotating ones. In particular, an instability develops that looks like the classical black hole bomb mechanism…