6 research outputs found
Cleaning of Hot Producer Gas in a Catalytic Adiabatic Packed Bed Reactor with Periodic Flow Reversal
Evidence for anisotropy of cosmic acceleration
Observations reveal a âbulk flowâ in the local Universe which is faster and extends to much larger scales than are expected around a typical observer in the standard ÎCDM cosmology. This is expected to result in a scale-dependent dipolar modulation of the acceleration of the expansion rate inferred from observations of objects within the bulk flow. From a maximum-likelihood analysis of the Joint Light-curve Analysis catalogue of Type Ia supernovae, we find that the deceleration parameter, in addition to a small monopole, indeed has a much bigger dipole component aligned with the cosmic microwave background dipole, which falls exponentially with redshift z: q0 = qm + qd.nÌ exp(-z/S). The best fit to data yields qdâ=ââ8.03 and Sâ=â0.0262 (âdââŒâ100âMpc), rejecting isotropy (qdâ=â0) with 3.9Ï statistical significance, while qmâ=ââ0.157 and consistent with no acceleration (qmâ=â0) at 1.4Ï. Thus the cosmic acceleration deduced from supernovae may be an artefact of our being non-Copernican observers, rather than evidence for a dominant component of âdark energyâ in the Universe