229 citations · 1.1k across the 54 of their papers we have counts for
12 papers · 1 filter
Large- Random Matrix Gravity and the Double Hierarchy Problem
Nima Khosravi
Why are the cosmological constant, electroweak and Planck scales so different? This ``double hierarchy" problem, where , is one of the most pressing in fun…
On scale-free extensions of massive (bi-)gravity
Giulia Cusin, Nima Khosravi, Johannes Noller
We discuss a scale-free model of bigravity, in which the mass parameter of the standard bigravity potential is promoted to a dynamical scalar field. This modification retains the g…
Spontaneous "Scalar-Vector Galileons" from "Weyl bi-Connection" model
Nima Khosravi
Weyl bi-connection model manifests a natural framework to automatically produce the Galileon structure. It is shown that this framework can explain scalar Galileon, vector Galileon…
Geometric Massive Gravity in Multi-Connection Framework
Nima Khosravi
What is the right way to interpret a massive graviton? We generalize the kinematical framework of general relativity to multiple connections. The average of the connections is itse…
The role of vector fields in modified gravity scenarios
Gianmassimo Tasinato, Kazuya Koyama, Nima Khosravi
Gravitational vector degrees of freedom typically arise in many examples of modified gravity models. We start to systematically explore their role in these scenarios, studying the…
Stability of the Self-accelerating Universe in Massive Gravity
Nima Khosravi, Gustavo Niz, Kazuya Koyama +1
We study linear perturbations around time dependent spherically symmetric solutions in the Lambda_3 massive gravity theory, which self-accelerate in the vacuum. We find that the dy…