Day 583

Friday.

1401.4615
Neutrino Oscillation from hidden GRB jets
Fraija, Méndez

Study of neutrino resonance oscillation during stellar collapse/merger events/GRB, which produces neutrinos via electron-positron annihilation.

1401.4645
Hunting a wandering supermassive black hole in M31 Halo -- Hermitage of black hole
Miki, et al

The Magorrian relation indicates that almost all galaxies are occupied by a central SMBH of mass 1e-3 of its spheroidal component; also, galaxies enlarge through multiple merging events.  Consequently, SMBHs are expected to wander in the halos of their host galaxies following a galaxy collision, although evidence of this activity is currently lacking.  Investigate a current plausible location of an SMBH wandering in the halo of M31.  According to theoretical studies of N-body sims, some of the many substructures in the M31 halo are remnants of a minor merger occurring about 1 Gyr ago.  Evaluate the possible parameter space of the in falling orbit of the progenitor---perform numerous parameter studies; reduce uncertainties in the predicted position of the expected SMBH, calculate the time evolution of the SMBH in the progenitor dwarf galaxy from N-body sims using the plausible parameter sets.  Results show that the SMBH lies within the halo (~20-50 kpc from the M31 center), closer to the MW than the M31 disk.  Furthermore, the predicted current positions of the SMBH were restricted to an observational field of 0.6x0.7 deg. in the NE region of the M31 halo.  Discuss the origin of the infalling orbit of the satellite galaxy and its relationships with the recently discovered vast thin disk plane of satellite galaxies around M31.

1401.5044
Large scale cosmological anomalies and inhomogeneous dark energy
Perivolaropoulos

For DM, there are observational constraint on departure from cosmological principle on Hubble scales (something that may indicate a non-trivial departure, or a simple LCDM fluctuation).  For DE, there are no significant observational constraints for Hubble scale inhomogeneities.  In this brief review, discuss some of the theoretical models that can naturally lead to inhomogeneous dark energy, their observational constraints and their potential to explain the large scale cosmic anomalies.

1401.4784
STEP and fundamental physics
Overduin et al

STEP == Satellite Test of the Equivalence Principle, sensitivity advancement from 2e13 to 1e18 through multiple comparison of the motions of 4 pairs of test masses of different compositions in a drag-free earth orbiting satellite.  Null result pushes upper limit on any coupling between standard-model fields and at the new light degrees of freedom generically predicted by theories down to unnaturally small levels.