Day 1448

Wednesday.

1808.01740
Apparent evidence for Hawking points in the CMB sky
An, et al

Present powerful observational evidence of anomalous individual points in the very early universe that appear to be sources of vast amounts of energy, revealed as specific signals found in the CMB sky.  Though seemingly problematic for cosmic inflation, the existence of such anomalous points is an implication of conformal cyclic cosmology (CCC), as what could be the Hawking points of the theory, these being the effects of the final Hawking evaporation of supermassive black holes in the aeon prior to ours.  Although of extremely low temperature at emission, in CCC this radiation is enormously concentrated by the conformal compression of the entire future of the black hole, resulting in a single point at the crossover into the current aeon, with the emission of vast numbers of particles, whose effects appear to be seen as the observed anomalous points.  The B-mode location found by BICEP2 is at one of these anomalous points.


1808.02136
Correlations between the dark matter and baryonic properties of CLASH galaxy clusters
Del Popolo, Umetsu, Le Delliou, Lee

Study the total and DM density profiles as well as their correlations for a sample of 15 high-mass galaxy clusters by extending the previous work on several clusters from Newman+.  The analysis focuses on 15 CLASH X-ray-selected clusters that have high-quality weak- and strong-lensing measurements from combined Subaru and HST observations.  The total density profiles derived from lensing are interpreted based on the 2-phase scenario of cluster formation.  In this context, the BCG forms in the first dissipative phase, followed by a dissipation less phase where baryonic physics flattens the inner DM distribution.  This results in the formation of clusters with modified DM distribution and several correlations between characteristic quantities of the clusters.  Find that the central DM density profiles of the clusters are strongly influenced by baryonic physics as found in earlier works.  The inner slope of the DM density for the CLASH clusters is found to be flatter than the NFW profile, ranging from alpha=0.30 to 0.79.  Examine correlations of the DM density slope alpha with the effective radius R_e and stellar mass M_e of the BCG, finding that these quantities are anti-correlated with a Spearman correlation coefficient of ~-0.6.  Also study the correlation between R_e and the cluster halo mass M_500, and the correlation between the total masses inside 5 kpc and 100 kpc.  Find that these quantities are correlated with Spearman coefficients of 0.68 and 0.64, respectively.  These observed correlations are in support of the physical picture proposed by Newman+.


1808.0248
Cosmic-ray anisotropy from large scale structure and the effect of magnetic horizons
Globus, et al

Motivated by the ~7% dipole anisotropy in the distribution of ultra-high energy cosmic-rays (UHECRs) above 8 EeV, explore the anisotropy induced by the large scale structure, using constrained simulations of the local Universe and taking into account the effect of magnetic fields.  The value of the intergalactic magnetic field (IGMF) is critical as it determines the UHECR cosmic horizon.  Calculate the UHECR sky maps for different values of the IGMF variance and show the effect of the UHECR horizon on the observed anisotropy.  The footprint of the local (<~350 Mpc) Universe on the UHECR background, a small angular scale enhancement in the Northern Hemisphere, is seen.  At 11.5 EeV (the median value of the energy bin at which the dipole has been reported), the LSS-indiced dipole amplitude is A_1~10%, for IGMF in the range [0.3-3] nG for protons, Helium and Nitrogen, compatible with the rms value derived from the cosmic power spectrum.  However at these energies the UHECRs are also influenced by the galactic magnetic field (GMF); discuss its effect on the LSS-indiced anisotropy.