6 papers
Constraining dark energy with complementary probes of large-scale structure
Neel Shah, Kazuya Koyama, Johannes Noller +1
To observationally pin down the nature of dark energy, it is essential to consistently model cosmological perturbations in the presence of dark energy alongside the background expa…
Testing Dark Energy with Black Hole Ringdown
Laurens Smulders, Johannes Noller, Sergi Sirera
We show that dynamical dark energy theories can imprint modifications on the quasi-normal mode (QNM) spectrum characterising black hole ringdown. The time dependence of dyna…
Stable black hole solutions with cosmological hair
Laurens Smulders, Johannes Noller
Dynamical dark energy theories generically introduce a time-dependent field that causes the accelerated expansion of the Universe on large scales. When embedding black hole solutio…
Inverting no-hair theorems: How requiring General Relativity solutions restricts scalar-tensor theories
Hajime Kobayashi, Shinji Mukohyama, Johannes Noller +3
Black hole solutions in general scalar-tensor theories are known to permit hair, i.e. non-trivial scalar profiles and/or metric solutions different from the ones of General Relativ…
Stability and quasinormal modes for black holes with time-dependent scalar hair
Sergi Sirera, Johannes Noller
We investigate black hole solutions with time-dependent (scalar) hair in scalar-tensor theories. Known exact solutions exist for such theories at the background level, where the me…
Constraining dark energy with the integrated Sachs-Wolfe effect
Emeric Seraille, Johannes Noller, Blake D. Sherwin
We use the integrated Sachs-Wolfe (ISW) effect, by now detectable at within the context of CDM cosmologies, to place strong constraints on dynamical dark energy theo…