812 research outputs found

    Search for uncharged faster than light particles

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    Searching for uncharged particles with spacelike four momentum traveling faster than ligh

    A Possible Origin of Dark Energy

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    We discuss the possibility that the existence of dark energy may be due to the presence of a spin zero field ϕ(x)\phi(x), either elementary or composite. In the presence of other matter field, the transformation ϕ(x)ϕ(x)+\phi(x)\to \phi(x) + constant can generate a negative pressure, like the cosmological constant. In this picture, our universe can be thought as a very large bag, similar to the much smaller MIT bag model for a single nucleon.Comment: 4 pages, no figure, typos correcte

    Initial Hubble Diagram Results from the Nearby Supernova Factory

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    The use of Type Ia supernovae as distance indicators led to the discovery of the accelerating expansion of the universe a decade ago. Now that large second generation surveys have significantly increased the size and quality of the high-redshift sample, the cosmological constraints are limited by the currently available sample of ~50 cosmologically useful nearby supernovae. The Nearby Supernova Factory addresses this problem by discovering nearby supernovae and observing their spectrophotometric time development. Our data sample includes over 2400 spectra from spectral timeseries of 185 supernovae. This talk presents results from a portion of this sample including a Hubble diagram (relative distance vs. redshift) and a description of some analyses using this rich dataset.Comment: Short version of proceedings for ICHEP08, Philadelphia PA, July 2008; see v1 for full-length versio

    The Rising Light Curves of Type Ia Supernovae

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    We present an analysis of the early, rising light curves of 18 Type Ia supernovae (SNe Ia) discovered by the Palomar Transient Factory (PTF) and the La Silla-QUEST variability survey (LSQ). We fit these early data flux using a simple power-law (f(t)=α×tn)(f(t) = {\alpha\times t^n}) to determine the time of first light (t0)({t_0}), and hence the rise-time (trise)({t_{rise}}) from first light to peak luminosity, and the exponent of the power-law rise (nn). We find a mean uncorrected rise time of 18.98±0.5418.98 {\pm} 0.54 days, with individual SN rise-times ranging from 15.9815.98 to 24.724.7 days. The exponent n shows significant departures from the simple 'fireball model' of n=2n = 2 (or f(t)t2{f(t) \propto t^2}) usually assumed in the literature. With a mean value of n=2.44±0.13n = 2.44 {\pm} 0.13, our data also show significant diversity from event to event. This deviation has implications for the distribution of 56Ni throughout the SN ejecta, with a higher index suggesting a lesser degree of 56Ni mixing. The range of n found also confirms that the 56Ni distribution is not standard throughout the population of SNe Ia, in agreement with earlier work measuring such abundances through spectral modelling. We also show that the duration of the very early light curve, before the luminosity has reached half of its maximal value, does not correlate with the light curve shape or stretch used to standardise SNe Ia in cosmological applications. This has implications for the cosmological fitting of SN Ia light curves.Comment: 19 pages, 19 figures, accepted for publication in MNRA
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