192 citations · 379 across the 7 of their papers we have counts for
7 papers
The and tensions necessitate early and late time changes to CDM
Steven J. Clark, Kyriakos Vattis, JiJi Fan +1
An only early or only late time alteration to CDM has been inadequate at resolving both the and tensions simultaneously; however, a combination of early and late tim…
Deep learning the astrometric signature of dark matter substructure
Kyriakos Vattis, Michael W. Toomey, Savvas M. Koushiappas
We study the application of machine learning techniques for the detection of the astrometric signature of dark matter substructure. In this proof of principle a population of dark…
Could the 2.6 object in GW190814 be a primordial black hole?
Kyriakos Vattis, Isabelle S. Goldstein, Savvas M. Koushiappas
On June 20, 2020, the LIGO-Virgo collaboration announced the discovery of GW190814, a gravitational wave event originating from a binary system merger between a black hole of mass…
Cosmological constraints on late-universe decaying dark matter as a solution to the tension
Steven J. Clark, Kyriakos Vattis, Savvas M. Koushiappas
It has been suggested that late-universe dark matter decays can alleviate the tension between measurements of in the local universe and its value inferred from cosmic microwa…
Late universe decaying dark matter can relieve the H_0 tension
Kyriakos Vattis, Savvas M. Koushiappas, Abraham Loeb
We study the cosmological effects of two-body dark matter decays where the products of the decay include a massless and a massive particle. We show that if the massive daughter par…
Self-interacting dark matter constraints in a thick dark disk scenario
Kyriakos Vattis, Savvas M. Koushiappas
A thick dark matter disk is predicted in cold dark matter simulations as the outcome of the interaction between accreted satellites and the stellar disk in Milky Way sized halos. W…
Solving the Vlasov equation in two spatial dimensions with the Schrödinger method
Michael Kopp, Kyriakos Vattis, Constantinos Skordis
We demonstrate that the Vlasov equation describing collisionless self-gravitating matter may be solved with the so-called Schrödinger method (ScM). With the ScM, one solves the Sch…