Dark Interactions: Perspectives from Theory and Experiment

Session

Contributed Talks II

4 Oct 2018, 14:00

Physics Department, Bldg. 510, Large Seminar Room (Brookhaven National Laboratory)

Conveners

Contributed Talks II

• Michael Begel (Brookhaven National Lab)

86. ALPs: What can we learn from neutron stars and X-ray astronomy?

Kuver Sinha (University of Oklahoma)

04/10/2018, 14:00

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...

87. Lightish but clumpy: scalar dark matter from inflationary fluctuations

Gonzalo Alonso Alvarez (Univeristy of Heidelberg)

04/10/2018, 14:25

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...

90. Asymmetric Structure Formation.

Daniel Egaña (Stony Brook University)

04/10/2018, 14:50

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...

91. Search for H --> Z(dark)Zdark --> 4l with ATLAS

Diallo Boye (University of Johannesburg)

04/10/2018, 15:15