3-10 August 2016
Chicago IL USA
US/Central timezone
There is a live webcast for this event.

Warm Dark Matter in Two Higgs Doublet Models

Aug 6, 2016, 6:00 PM
Riverwalk A/B

Riverwalk A/B

Poster Astro-particle Physics and Cosmology Poster Session


Dr Shreyashi Chakdar (University of Virginia)


In this work, we show that a neutral scalar field, $\sigma$, of two Higgs doublet extensions of the Standard Model incorporating the seesaw mechanism for neutrino masses can be identified as a consistent `warm' dark matter candidate with a mass of order keV. The relic density of $\sigma$ is correctly reproduced by virtue of the late decay of a right-handed neutrino $N$ participating in the seesaw mechanism. Constraints from cosmology determine the mass and lifetime of $N$ to be $M_N \approx 25 ~{\rm GeV} - 20 ~{\rm TeV}$ and $\tau_N \approx (10^{-4} - 1)$ sec. These models can also explain the 3.5 keV $X$-ray anomaly in the extra-galactic spectrum that has been recently reported in terms of the decay $\sigma \rightarrow \gamma \gamma$. Future tests of these models at colliders and in astrophysical settings are also discussed.

Primary author

Dr Shreyashi Chakdar (University of Virginia)


Kaladi Babu (Oklahoma State University) Rabindra Mohapatra (University of Maryland)

Presentation materials