57 citations · 199 across the 8 of their papers we have counts for
9 papers
Einstein-Gauss-Bonnet gravity with extra dimensions
Carsten van de Bruck, Chris Longden
We consider a theory of modified gravity possessing d extra spatial dimensions with a maximally symmetric metric and a scale factor, whose (4+d)-dimensional gravitational action co…
Gauss-Bonnet-coupled Quintessential Inflation
Carsten van de Bruck, Konstantinos Dimopoulos, Chris Longden +1
We study in detail a new model of quintessential inflation where the inflaton field is coupled to the Gauss-Bonnet term. This coupling ensures that the variation of the field is ke…
Non-standard hierarchies of the runnings of the spectral index in inflation
Chris Longden
Recent analyses of cosmic microwave background surveys have revealed hints that there may be a non-trivial running of the running of the spectral index. If future experiments were…
The adiabatic/entropy decomposition in theories with multiple sound speeds
Chris Longden
We consider theories of multi-field inflation and ask the question of how to define the adiabatic and entropy perturbations, widely used in calculating the curvatur…
Non-Gaussianity in multi-sound-speed disformally coupled inflation
Carsten van de Bruck, Tomi Koivisto, Chris Longden
Most, if not all, scalar-tensor theories are equivalent to General Relativity with a disformally coupled matter sector. In extra-dimensional theories such a coupling can be underst…
Running of the Running and Entropy Perturbations During Inflation
Carsten van de Bruck, Chris Longden
In single field slow-roll inflation, one expects that the spectral index is first order in slow-roll parameters. Similarly, its running and the runni…