788 citations · 2.3k across the 36 of their papers we have counts for
20 papers · 1 filter
Improved bounds on singlet dark matter
Andi Hektor, Andrzej Hryczuk, Kristjan Kannike
We reconsider complex scalar singlet dark matter stabilised by a symmetry. We refine the stability bounds on the potential and use constraints from unitarity on sc…
Constraints on ALPs and excited dark matter from the EDGES 21-cm absorption signal
Andi Hektor, Gert Hütsi, Luca Marzola +1
The recent observation of the 21-cm absorption signal by the EDGES experiment provides a new observational window into the dynamics of the young Universe. Based on this result, we…
The EDGES 21 cm Anomaly and Properties of Dark Matter
Sean Fraser, Andi Hektor, Gert Hütsi +8
The recently claimed anomaly in the measurement of the 21 cm hydrogen absorption signal by EDGES at , if cosmological, requires the existence of new physics. The possible…
Modifying dark matter indirect detection signals by thermal effects at freeze-out
Andi Hektor, Kristjan Kannike, Ville Vaskonen
We present an extension of the Standard Model, containing a fermion dark matter candidate and two real scalar singlets, where the observed dark matter abundance is produced via fre…
Gamma-ray line constraints on Coy Dark Matter
Andi Hektor, Luca Marzola, Taavi Tuvi
Coy dark matter is an effective scheme in which a fermionic dark matter candidate interacts with the Standard Model fermions via a pseudoscalar mediator. This simple setup avoids t…
Large loop-coupling enhancement of a heavy pseudoscalar from a light dark sector
Stefano Di Chiara, Andi Hektor, Kristjan Kannike +2
The small background and the sensitivity to charged particles via a leading order loop coupling make the diphoton channel a privileged experimental test for new physics models. We…