Search Publications
Evolution of the f σ8 tension with the Planck15 /Λ CDM determination and implications for modified gravity theories
Kazantzidis, Lavrentios; Perivolaropoulos, Leandros
We construct an updated extended compilation of distinct (but possibly correlated) f σ8(z ) redshift space distortion (RSD) data published between 2006 and 2018. It consists of 63 datapoints and is significantly larger than previously used similar data sets. After fiducial model correction we obtain the best fit Ω0 m-σ8<…
Reducing the H0 and σ8 tensions with dark matter-neutrino interactions
Di Valentino, Eleonora; Bœhm, Céline; Bouchet, François R. +1 more
The introduction of dark matter-neutrino interactions modifies the cosmic microwave background (CMB) angular power spectrum at all scales, thus affecting the reconstruction of the cosmological parameters. Such interactions can lead to a slight increase of the value of H0 and a slight decrease of S8≡σ8√{Ωm
GeV-scale thermal WIMPs: Not even slightly ruled out
Slatyer, Tracy R.; Beacom, John F.; Ng, Kenny C. Y. +1 more
Weakly interacting massive particles (WIMPs) have long reigned as one of the leading classes of dark matter candidates. The observed dark matter abundance can be naturally obtained by freezeout of weak-scale dark matter annihilations in the early Universe. This "thermal WIMP" scenario makes direct predictions for the total annihilation cross secti…
Implications of an extended dark energy cosmology with massive neutrinos for cosmological tensions
Kamionkowski, Marc; Boddy, Kimberly K.; Poulin, Vivian +1 more
We perform a comprehensive analysis of the most common early- and late-universe solutions to the H0 , Ly -α , and S8 discrepancies. When considered on their own, massive neutrinos provide a natural solution to the S8 discrepancy at the expense of increasing the H0 tension. If all extensions are considere…
Vacuum phase transition solves the H0 tension
Di Valentino, Eleonora; Melchiorri, Alessandro; Linder, Eric V.
Taking the Planck cosmic microwave background data and the more direct Hubble constant measurement data as unaffected by systematic offsets, the values of the Hubble constant H0 interpreted within the Λ CDM cosmological constant and cold dark matter cosmological model are in ∼3.3 σ tension. We show that the Parker vacuum metamorphosis (…
Violation of the equivalence principle from light scalar dark matter
Wolf, Peter; Hees, Aurélien; Minazzoli, Olivier +2 more
In this paper, we study the local observational consequences of a violation of the Einstein equivalence principle induced by models of light scalar dark matter (DM). We focus on two different models where the scalar field couples linearly or quadratically to the standard model of matter fields. For both these cases, we derive the solutions of the …
Large-scale stability and astronomical constraints for coupled dark-energy models
Yang, Weiqiang; Pan, Supriya; Barrow, John D.
We study large-scale inhomogeneous perturbations and instabilities of interacting dark-energy models. Past analysis of large-scale perturbative instabilities has shown that we can only test interacting dark-energy models with observational data when their parameter ranges are either wx≥-1 and ξ ≥0 , or wx≤-1 and ξ ≤0 , where …
Explaining LIGO's observations via isolated binary evolution with natal kicks
Belczynski, Krzysztof; Holz, Daniel E.; Berti, Emanuele +5 more
We compare binary evolution models with different assumptions about black-hole natal kicks to the first gravitational-wave observations performed by the LIGO detectors. Our comparisons attempt to reconcile merger rate, masses, spins, and spin-orbit misalignments of all current observations with state-of-the-art formation scenarios of binary black …
Indirect detection of neutrino portal dark matter
Batell, Brian; Han, Tao; Shams Es Haghi, Barmak
We investigate the feasibility of the indirect detection of dark matter in a simple model using the neutrino portal. The model is very economical, with right-handed neutrinos generating neutrino masses through the type-I seesaw mechanism and simultaneously mediating interactions with dark matter. Given the small neutrino Yukawa couplings expected …
Dark matter hurricane: Measuring the S1 stream with dark matter detectors
Belokurov, Vasily; Evans, N. Wyn; Myeong, GyuChul +2 more
The recently discovered S1 stream passes through the Solar neighborhood on a low inclination, counterrotating orbit. The progenitor of S1 is a dwarf galaxy with a total mass comparable to the present-day Fornax dwarf spheroidal, so the stream is expected to have a significant DM component. We compute the effects of the S1 stream on WIMP and axion …