4,530 research outputs found
The Peculiar Velocities of Local Type Ia Supernovae and their Impact on Cosmology
We quantify the effect of supernova Type Ia peculiar velocities on the
derivation of cosmological parameters. The published distant and local Ia SNe
used for the Supernova Legacy Survey first-year cosmology report form the
sample for this study. While previous work has assumed that the local SNe are
at rest in the CMB frame (the No Flow assumption), we test this assumption by
applying peculiar velocity corrections to the local SNe using three different
flow models. The models are based on the IRAS PSCz galaxy redshift survey, have
varying beta = Omega_m^0.6/b, and reproduce the Local Group motion in the CMB
frame. These datasets are then fit for w, Omega_m, and Omega_Lambda using
flatness or LambdaCDM and a BAO prior. The chi^2 statistic is used to examine
the effect of the velocity corrections on the quality of the fits. The most
favored model is the beta=0.5 model, which produces a fit significantly better
than the No Flow assumption, consistent with previous peculiar velocity
studies. By comparing the No Flow assumption with the favored models we derive
the largest potential systematic error in w caused by ignoring peculiar
velocities to be Delta w = +0.04. For Omega_Lambda, the potential error is
Delta Omega_Lambda = -0.04 and for Omega_m, the potential error is Delta
Omega_m < +0.01. The favored flow model (beta=0.5) produces the following
cosmological parameters: w = -1.08 (+0.09,-0.08), Omega_m = 0.27 (+0.02,-0.02)
assuming a flat cosmology, and Omega_Lambda = 0.80 (+0.08,-0.07) and Omega_m =
0.27 (+0.02,-0.02) for a w = -1 (LambdaCDM) cosmology.Comment: 4 pages, 2 figures, 1 table, accepted for publication in ApJ Letter
Exotic coloured fermions and lepton number violation at the LHC
Majorana neutrino mass models with a scale of lepton number violation (LNV)
of order TeV potentially lead to signals at the LHC. Here, we consider an
extension of the standard model with a coloured octet fermion and a scalar
leptoquark. This model generates neutrino masses at 2-loop order. We make a
detailed MonteCarlo study of the LNV signal at the LHC in this model, including
a simulation of standard model backgrounds. Our forecast predicts that the LHC
with 300/fb should be able to probe this model up to colour octet fermion
masses in the range of (2.6-2.7) TeV, depending on the lepton flavour of the
final state.Comment: 14 pages, 2 figure
Supernova 2009kf: An Ultraviolet Bright Type IIP Supernova Discovered with Pan-STARRS 1 and GALEX
We present photometric and spectroscopic observations of a luminous Type IIP Supernova (SN) 2009kf discovered by the Pan-STARRS 1 (PS1) survey and also detected by the Galaxy Evolution Explorer. The SN shows a plateau in its optical and bolometric light curves, lasting approximately 70 days in the rest frame, with an absolute magnitude of M_V = -18.4 mag. The P-Cygni profiles of hydrogen indicate expansion velocities of 9000 km s^(-1) at 61 days after discovery which is extremely high for a Type IIP SN. SN 2009kf is also remarkably bright in the near-ultraviolet (NUV) and shows a slow evolution 10-20 days after optical discovery. The NUV and optical luminosity at these epochs can be modeled with a blackbody with a hot effective temperature (T ~ 16,000 K) and a large radius (R ~ 1 × 10^(15) cm). The bright bolometric and NUV luminosity, the light curve peak and plateau duration, the high velocities, and temperatures suggest that 2009kf is a Type IIP SN powered by a larger than normal explosion energy. Recently discovered high-z SNe (0.7 < z < 2.3) have been assumed to be IIn SNe, with the bright UV luminosities due to the interaction of SN ejecta with a dense circumstellar medium. UV-bright SNe similar to SN 2009kf could also account for these high-z events, and its absolute magnitude M_(NUV) = -21.5 ± 0.5 mag suggests such SNe could be discovered out to z ~ 2.5 in the PS1 survey
Probing the Intergalactic Medium with Fast Radio Bursts
The recently discovered fast radio bursts (FRBs), presumably of
extra-galactic origin, have the potential to become a powerful probe of the
intergalactic medium (IGM). We point out a few such potential applications. We
provide expressions for the dispersion measure and rotation measure as a
function of redshift, and we discuss the sensitivity of these measures to the
HeII reionization and the IGM magnetic field. Finally we calculate the
microlensing effect from an isolate, extragalctic stellar-mass compact object
on the FRB spectrum. The time delays between the two lensing images will induce
constructive and destructive interference, leaving a specific imprint on the
spectra of FRBs. With a high all-sky rate, a large statistical sample of FRBs
is expected to make these applications feasible.Comment: 4 pages, 1 figure; Typos for the variable x in Eq.6 corrected;
Published in ApJ; Originally the Appendix E of arXiv:1402.4766; Separated
from the main paper upon the referee's reques
Loss of protein kinase calpha expression may enhance the tumorigenic potential of Gli1 in basal cell carcinoma
Gli1 has now been implicated in switching between motility and static cell replication. Part of a series of papers, this study tracted PKCalpha expression in relation to Gli1 in various static and motile cell areas of the hair sheath and BCC
From Spitzer Galaxy Photometry to Tully-Fisher Distances
This paper involves a data release of the observational campaign: Cosmicflows
with Spitzer (CFS). Surface photometry of the 1270 galaxies constituting the
survey is presented. An additional ~ 400 galaxies from various other Spitzer
surveys are also analyzed. CFS complements the Spitzer Survey of Stellar
Structure in Galaxies, that provides photometry for an additional 2352
galaxies, by extending observations to low galactic latitudes (|b|<30 degrees).
Among these galaxies are calibrators, selected in K band, of the Tully-Fisher
relation. The addition of new calibrators demonstrate the robustness of the
previously released calibration. Our estimate of the Hubble constant using
supernova host galaxies is unchanged, H0 = 75.2 +/- 3.3 km/s/Mpc.
Distance-derived radial peculiar velocities, for the 1935 galaxies with all the
available parameters, will be incorporated into a new data release of the
Cosmicflows project. The size of the previous catalog will be increased by 20%,
including spatial regions close to the Zone of Avoidance.Comment: Accepted for publication in MNRAS, 16 pages, 14 figures, 6 table
Quantum chaos and critical behavior on a chip
The Dicke model describes N qubits (or two-level atoms) homogenously coupled
to a bosonic mode. Here we examine an open-system realization of the Dicke
model, which contains critical and chaotic behaviour. In particular, we extend
this model to include an additional open transport qubit (TQ) (coupled to the
bosonic mode) for passive and active measurements. We illustrate how the
scaling (in the number of qubits N) of the superradiant phase transition can be
observed in both current and current-noise measurements through the transport
qubit. Using a master equation, we also investigate how the phase transition is
affected by the back-action from the transport qubit and losses in the cavity.
In addition, we show that the non-integrable quantum chaotic character of the
Dicke model is retained in an open-system environment. We propose how all of
these effects could been seen in a circuit QED system formed from an array of
superconducting qubits, or an atom chip, coupled to a quantized resonant cavity
(e.g., a microwave transmission line).Comment: 7 page
Building nursing and midwifery leadership capacity in the Pacific
© 2016 International Council of Nurses Aim: The Australian Award Fellowship Program aimed to strengthen nursing and midwifery leadership and capacity in developing countries in the Pacific. Background: It is necessary to build an optimal global health workforce, and leadership and mentorship are central to this need. This is especially important in small island states such as the Pacific who have limited capacity and resources. Introduction: This health system strengthening program addressed quality improvement in education, through the mentorship of potential nursing and midwifery leaders in the South Pacific Region. Methods: Program participants between 2013 and 2015 were interviewed. Data were audio-taped, transcribed and analysed thematically using an inductive process. Results: Thirty-four nurses and midwives from 12 countries participated. There were four main themes arising from the data which were: having a country-wide objective, learning how to be a leader, negotiating barriers and having effective mentorship. Discussion: Our study showed that participants deemed their mentorship from country leaders highly valuable in relation to completing their projects, networking and role modelling. Similar projects are described. Limitations: The limitation of this study was its small size. There is a need to continue to build the momentum of the program and Fellows in each country in order to build regional networks. Conclusions and implications for nursing and midwifery: The Program has provided beneficial leadership education and mentorship for nurses and midwives from Pacific countries. It has provided a platform to develop quality improvement projects in line with national priorities. Implications for health policy: Global aid programs and the recipients of the program would benefit from comparable health strengthening approaches to nursing and midwifery in similar developing countries
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