Conveners
Contributed Talks II
- Michael Begel (Brookhaven National Lab)
Axion-like particles (ALPs) produced in the core of a neutron star can convert to photons in the magnetosphere, leading to possible signatures in the soft and hard X-ray emission from these sources. We study these signatures taking the magnetar SGR 1806-20 as an example. In particular, assuming ALP emission rates from the core that are just subdominant to neutrino emission, the parameter...
It is well known that light scalar fields present during inflation are coherently excited. We show that if the field couples to gravity in a non-minimal way, the fluctuations at large scales are suppressed with respect to the small scales ones. This fact allows for the field excitations to make a sizeable contribution to the energy density of the universe without generating too large...
We study the simplest model of a dark sector that forms structure via cooling, in analogy to the baryonic sector.
This dark sector is an asymmetric, sub-dominant component of dark matter, that consists of a dark electron and a dark photon.
The dark-electron perturbations collapse and fragment due to bremsstrahlung cooling, forming astronomical objects of varying size and compactness. These...
