3 research outputs found
The Hubble Rate Trouble: An Effective Field Theory of Dark Matter
The Hubble constant inferred from the 6-parameter fit to the CMB power
spectrum conflicts with the value obtained from direct measurements via type Ia
supernova and Cepheids observations. We write down effective operators
involving spin-0, spin-1/2, and spin-1 dark matter that lead to the
relativistic production of dark matter particles at early times, and
consequently lead to an increase in the number of relativistic degrees of
freedom. This mechanism which is amenable to CMB, BBN, and structure formation
observables can sufficiently raise the value of the Hubble constant derived
from CMB and reconcile local and CMB probes of the Hubble constant. This
mechanism alone increases up to , and with
the help of a Phantom-like cosmology, reach . Lastly, we outline the region of parameter space which reproduces
while obeying all relevant
constraints.Comment: 10 pages and 14 figure
The Hubble Rate Trouble: An Effective Field Theory of Dark Matter
The Hubble constant inferred from the 6-parameter fit to the CMB power spectrum conflicts with the value obtained from direct measurements via type Ia supernova and Cepheids observations. We write down effective operators involving spin-0, spin-1/2, and spin-1 dark matter that lead to the relativistic production of dark matter particles at early times, and consequently lead to an increase in the number of relativistic degrees of freedom. This mechanism which is amenable to CMB, BBN, and structure formation observables can sufficiently raise the value of the Hubble constant derived from CMB and reconcile local and CMB probes of the Hubble constant. This mechanism alone increases up to , and with the help of a Phantom-like cosmology, reach . Lastly, we outline the region of parameter space which reproduces while obeying all relevant constraints