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Cosmological Constraints from Type Ia Supernovae Peculiar Velocity Measurements - دانلود رایگان



دانلود رایگان Cosmological Constraints from Type Ia Supernovae Peculiar Velocity Measurements

دانلود رایگان Cosmological Constraints from Type Ia Supernovae Peculiar Velocity Measurements The first compelling evidence that the Universe is undergoing
a period of accelerated expansion was provided
by observations of Type Ia supernovae (SNe) [1, 2].
The data from many current [3, 4, 5] and near future
[6, 7, 8, 9] surveys should eventually constrain the effective
dark energy equation of state to better than 10%.
Density inhomogeneities cause the SNe to deviate from
the Hubble flow, as gravitational instability leads to matter
flowing out of under-densities and into over-densities.
These “peculiar velocities (PVs) lead to an increased
scatter in the Hubble diagram, of which several studies
have been made [10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22]. When combining low and high redshift SNe in
order to estimate the properties of the dark energy, the
velocity contributions are usually modeled as a Gaussian
noise term which is uncorrelated between different SNe.
However, as recently emphasized [23], in the limit of low
redshift z <∼
0.1 and large sample size, the correlations
between SNe PVs contribute significantly to the overall
error budget. In this letter we investigate the effect of incorporating
these correlations using the largest available
low redshift compilation [17].


Cosmological


Type Ia Supernovae


Peculiar Velocity Measurements


مقاله


پاورپوینت


فایل فلش


کارآموزی


گزارش تخصصی


اقدام پژوهی


درس پژوهی


جزوه


خلاصه


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