Search Publications
Arbitrariness of potentials in interacting quintessence models
Bamba, Kazuharu; Roy, Nandan
Though we have entered an era of high precision cosmology the form of the quintessence potentials still remain arbitrary. In this work we explore the interacting quintessence models considering a parametrization of the quintessence potentials and tried to constrain the form of potentials using the recent cosmological observations. The particular p…
Direct detection anomalies in light of G A I A data
Buckley, Matthew R.; Mohlabeng, Gopolang; Murphy, Christopher W.
Measurements from the GAIA satellite have greatly increased our knowledge of the dark matter velocity distributions in the Solar neighborhood. There is evidence for multiple cold structures nearby, including a high-velocity stream counterrotating relative to the Sun. This stream could significantly alter the spectrum of recoil energies and increas…
Novel methods to measure the gravitational constant in space
Mendes, L.; Russano, G.; Nofrarias, M. +76 more
We present two novel methods, tested by LISA Pathfinder, to measure the gravitational constant G for the first time in space. Experiment 1 uses electrostatic suspension forces to measure a change in acceleration of a test mass due to a displaced source mass. Experiment 2 measures a change in relative acceleration between two test masses due to a s…
Reconstructing the weak lensing magnification distribution of type Ia supernovae
Wang, Yun; Zhai, Zhongxu
Weak lensing of type Ia supernovae (SNe Ia) is a systematic uncertainty in the use of SNe Ia as standard candles, as well as an independent cosmological probe, if the corresponding magnification distribution can be extracted from data. We study the peak brightness distribution of SNe Ia in the Pantheon sample and find that the high-z subsample sho…
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 …