Dr
Nicola Tamanini
(Max Planck Institute for Gravitational Physics (AEI))
27/09/2018, 14:00
Cosmology & Astroparticle Physics
In this talk I will present the current status of cosmological forecasts for the Laser Interferometric Space Antenna (LISA). I will show that LISA will constitute a unique cosmological probe able to measure the expansion of the universe from low redshifts (z=0.01) up to very large redshifts (z=10). This is made possible by the use of different gravitational wave sources as standard sirens:...
Dr
Ranjan Laha
(Johannes Gutenberg University Mainz)
27/09/2018, 14:20
Cosmology & Astroparticle Physics
We explore in detail the possibility that gravitational wave signals from binary inspirals are affected by a new force that couples only to dark matter particles. We discuss the impact of both the new force acting between the binary partners as well as radiation of the force carrier. We identify numerous constraints on any such scenario, ultimately concluding that observable effects on the...
Mr
Eric Madge
(Johannes Gutenberg University Mainz)
27/09/2018, 14:40
Cosmology & Astroparticle Physics
In this work, we consider a model in which the SM is extended by a lepton number gauge group $U(1)_\ell$. The arising gauge anomalies are canceled by adding two sets of SM vector-like leptons. We further add a scalar field that spontaneously breaks $U(1)_\ell$. A residual global symmetry ensures the stability of the lightest additional lepton, thus providing a dark matter candidate. We...
Mr
Paul Frederik Depta
(DESY)
27/09/2018, 14:55
Cosmology & Astroparticle Physics
Primordial black holes (PBHs) are a well-motivated candidate for dark matter that regained research interest after the first detections of gravitational waves by LIGO. PBHs can form binaries in the early universe. Due to the production process of PBHs, e.g. by large and rare density perturbations, clustering of PBHs can become important. This is used in the literature to avoid current...
Peter Niksa
(Uni HH II. Institut für Theoretische Physik)
27/09/2018, 15:10
Cosmology & Astroparticle Physics
We discuss the gravitational wave spectrum produced by magneto-hydrodynamic turbulence in a first order phase transitions.
In particular, we discuss the impact of the rate of turbulent decorrelation on the spectrum of gravitational waves and how this can impact future constraints on cosmological first order phase transitions.
Additionally, we discuss how "sound-wave" driven turbulence can...
Dr
Bradley Kavanagh
(GRAPPA, University of Amsterdam)
27/09/2018, 15:25
Cosmology & Astroparticle Physics
The observation of gravitational waves from binary black hole mergers has renewed interest in the possibility of primordial black holes (PBHs) that are around 10 to 100 times more massive than the Sun. Such PBHs may form large numbers of binaries before matter-radiation equality and, if these binaries survive until today, they may contribute to the merger rate observable by LIGO and Virgo....