401 citations · 3.5k across the 55 of their papers we have counts for
12 papers · 1 filter
Stochastic inflation at all order in slow-roll parameters: foundations
Diego Cruces, Cristiano Germani
In this paper we develop the formalism for the stochastic approach to inflation at all order in slow-roll parameters. This is done by including the momentum and Hamiltonian constra…
Analytical thresholds for black hole formation in general cosmological backgrounds
Albert Escrivà, Cristiano Germani, Ravi K. Sheth
We consider black holes which form from an initially spherically symmetric super-Hubble perturbation of a cosmological background filled by a perfect fluid with $w\in (0,1]…
Prospects for Fundamental Physics with LISA
Enrico Barausse, Emanuele Berti, Thomas Hertog +318
In this paper, which is of programmatic rather than quantitative nature, we aim to further delineate and sharpen the future potential of the LISA mission in the area of fundamental…
A universal threshold for primordial black hole formation
Albert Escrivà, Cristiano Germani, Ravi K. Sheth
In this letter, we argue and show numerically that the threshold to form primordial black holes from an initial spherically symmetric perturbation is, to an excellent approximation…
Failure of the stochastic approach to inflation beyond slow-roll
Diego Cruces, Cristiano Germani, Tomislav Prokopec
After giving a pedagogical review we clarify that the stochastic approach to inflation is generically reliable only at zeroth order in the (geometrical) slow-roll parameter i…
The Gross-Pitaevskii equations of a static and spherically symmetric condensate of gravitons
Francesc Cunillera, Cristiano Germani
In this paper we consider the Dvali and Gómez assumption that the end state of a gravitational collapse is a Bose-Einstein condensate of gravitons. We then construct the two Gross-…
Tracking our Universe to de Sitter by a Horndeski scalar
Cristiano Germani, Prado Martin-Moruno
Assuming both that our Universe is evolving into a de Sitter space and a vanishing cosmological constant, leaves only the option that the observed acceleration is provided by a "ki…
On the Onset of Inflation in Loop Quantum Cosmology
Cristiano Germani, William Nelson, Mairi Sakellariadou
Using a Liouville measure, similar to the one proposed recently by Gibbons and Turok, we investigate the probability that single-field inflation with a polynomial potential can las…
Magnetized Tolman-Bondi Collapse
Cristiano Germani, Christos G. Tsagas
We investigate the gravitational implosion of magnetized matter by studying the inhomogeneous collapse of a weakly magnetized Tolman-Bondi spacetime. The role of the field is analy…
Smooth branes and junction conditions in Einstein Gauss-Bonnet gravity
Nathalie Deruelle, Cristiano Germani
Using "smooth brane" solutions of the field equations, we give an alternative derivation of the junction conditions for a "brane" in a five dimensional "bulk", when gravity is gove…
On the thin-shell limit of branes in the presence of Gauss-Bonnet interactions
Carlos Barcelo, Cristiano Germani, Carlos F. Sopuerta
In this paper we study thick-shell braneworld models in the presence of a Gauss-Bonnet term. We discuss the peculiarities of the attainment of the thin-shell limit in this case and…
A Classical Interpretation of Maxwell's Equations in Curved Spacetime
C. Germani, D. Bini, R. T. Jantzen
We present an integral formulation of observer-dependent Maxwell's equations in curved spacetime and give a classical interpretation of them.