338 citations · 1.5k across the 27 of their papers we have counts for
6 papers · 1 filter
Cosmic Magnetic Fields and the CMB
Ruth Durrer
I describe the imprint of primordial magnetic fields on the CMB. I show that these are observable only if the field amplitude is of the order of $B\gsim 10^{-9}G$ on Mpc scale. I f…
On the frequency of gravitational waves
Chiara Caprini, Ruth Durrer, Riccardo Sturani
We show that there are physically relevant situations where gravitational waves do not inherit the frequency spectrum of their source but its wavenumber spectrum.
No-go theorem for k-essence dark energy
Camille Bonvin, Chiara Caprini, Ruth Durrer
We demonstrate that if k-essence can solve the coincidence problem and play the role of dark energy in the universe, the fluctuations of the field have to propagate superluminally…
Microlensing modulation by quadrupole variation
Florian Dubath, Maria Alice Gasparini, Ruth Durrer
We investigate microlensing in the case where the lens is considered as an extended object. We use a multipolar expansion of the lens potential and show that the time-varying natur…
Gravitational waves from stochastic relativistic sources: primordial turbulence and magnetic fields
Chiara Caprini, Ruth Durrer
The power spectrum of a homogeneous and isotropic stochastic variable, characterized by a finite correlation length, does in general not vanish on scales larger than the correlatio…
Dipole of the luminosity distance: a direct measure of H(z)
Camille Bonvin, Ruth Durrer, Martin Kunz
We show that the dipole of the luminosity distance is a useful observational tool which allows us to determine the Hubble parameter as a function of the redshift H(z). We determine…