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110 papers · 1 filter
GW250114: testing Hawking's area law and the Kerr nature of black holes
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1785
The gravitational-wave signal GW250114 was observed by the two LIGO detectors with a network matched-filter signal-to-noise ratio of 80. The signal was emitted by the coalescence o…
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…
Quintessence in the Weyl-Gauss-Bonnet model
José Jaime Terente Díaz, Konstantinos Dimopoulos, Mindaugas Karčiauskas +1
Quintessence models have been widely examined in the context of scalar-Gauss-Bonnet gravity, a subclass of Horndeski's theory, and were proposed as viable candidates for Dark Energ…
Observable Gravitational Waves from Hyperkination in Palatini Gravity and Beyond
Samuel Sánchez López, Konstantinos Dimopoulos, Alexandros Karam +1
We consider cosmology with an inflaton scalar field with an additional quartic kinetic term. Such a theory can be motivated by Palatini modified gravity. Assuming a runaway…
Herglotz Action for Homogeneous Cosmology
David Sloan
We present an action from which the dynamics of homogeneous cosmologies can be derived. The action has no dependence on scale within the system and hence is more parsimonious in it…
Palatini Quintessential Inflation
Konstantinos Dimopoulos, Alexandros Karam, Samuel Sánchez López +1
We construct a model of quintessential inflation in Palatini gravity employing a scalar field with a simple exponential potential and coupled to gravity with a running non-mi…