Status and perspectives of neutrino physics Athar, M. Sajjad; Barwick, Steven W.; Brunner, Thomas ...
Progress in particle and nuclear physics,
20/May , Volume:
124
Journal Article
Peer reviewed
Open access
This review demonstrates the unique role of the neutrino by discussing in detail the physics of and with neutrinos. We deal with neutrino sources, neutrino oscillations, absolute masses, ...interactions, the possible existence of sterile neutrinos, and theoretical implications. In addition, synergies of neutrino physics with other research fields are found, and requirements to continue successful neutrino physics in the future, in terms of technological developments and adequate infrastructures, are stressed.
ABSTRACT We present observations of four rapidly rising (trise 10 days) transients with peak luminosities between those of supernovae (SNe) and superluminous SNe (Mpeak −20)-one discovered and ...followed by the Palomar Transient Factory (PTF) and three by the Supernova Legacy Survey. The light curves resemble those of SN 2011kl, recently shown to be associated with an ultra-long-duration gamma-ray burst (GRB), though no GRB was seen to accompany our SNe. The rapid rise to a luminous peak places these events in a unique part of SN phase space, challenging standard SN emission mechanisms. Spectra of the PTF event formally classify it as an SN II due to broad H emission, but an unusual absorption feature, which can be interpreted as either high velocity H (though deeper than in previously known cases) or Si ii (as seen in SNe Ia), is also observed. We find that existing models of white dwarf detonations, CSM interaction, shock breakout in a wind (or steeper CSM), and magnetar spin down cannot readily explain the observations. We consider the possibility that a "Type 1.5 SN" scenario could be the origin of our events. More detailed models for these kinds of transients and more constraining observations of future such events should help to better determine their nature.
Matter power spectrum: from Ly α forest to CMB scales Chabanier, Solène; Millea, Marius; Palanque-Delabrouille, Nathalie
Monthly Notices of the Royal Astronomical Society,
10/2019, Volume:
489, Issue:
2
Journal Article
Peer reviewed
Open access
ABSTRACT
We present a new compilation of inferences of the linear 3D matter power spectrum at redshift $z\, {=}\, 0$ from a variety of probes spanning several orders of magnitude in physical scale ...and in cosmic history. We develop a new lower noise method for performing this inference from the latest Ly α forest 1D power spectrum data. We also include cosmic microwave background (CMB) temperature and polarization power spectra and lensing reconstruction data, the cosmic shear two-point correlation function, and the clustering of luminous red galaxies. We provide a Dockerized Jupyter notebook housing the fairly complex dependences for producing the plot of these data, with the hope that groups in the future can help add to it. Overall, we find qualitative agreement between the independent measurements considered here and the standard ΛCDM cosmological model fit to the Planck data.
We measure the sum of the neutrino particle masses using the three-dimensional galaxy power spectrum of the Sloan Digital Sky Survey III (SDSS-III) Baryon Oscillation Spectroscopic Survey Data ...Release 9 the constant MASS (CMASS) galaxy sample. Combined with the cosmic microwave background, supernova and additional baryonic acoustic oscillation data, we find upper 95 per cent confidence limits (CL) of the neutrino mass Σm
ν < 0.340 eV within a flat Λ cold dark matter (ΛCDM) background, and Σm
ν < 0.821 eV, assuming a more general background cosmological model. The number of neutrino species is measured to be N
eff = 4.308 ± 0.794 and
for these two cases, respectively. We study and quantify the effect of several factors on the neutrino measurements, including the galaxy power spectrum bias model, the effect of redshift-space distortion, the cut-off scale of the power spectrum and the choice of additional data. The impact of neutrinos with unknown masses on other cosmological parameter measurements is investigated. The fractional matter density and the Hubble parameter are measured to be
km s−1 Mpc−1 (flat ΛCDM) and
km s−1 Mpc−1 (more general background model). Based on a Chevallier-Polarski-Linder parametrization of the equation-of-state w of dark energy, we find that w = −1 is consistent with observations, even allowing for neutrinos. Similarly, the curvature ΩK and the running of the spectral index αs are both consistent with zero. The tensor-to-scalar ratio is constrained down to r < 0.198 (95 per cent CL, flat ΛCDM) and r < 0.440 (95 per cent CL, more general background model).
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