منابع مشابه
Cosmic Structure and Dark Energy
Dark energy has a dramatic effect on the dynamics of the universe, causing the recently discovered acceleration of the expansion. The dynamics are also central to the behavior of the growth of large scale structure, offering the possibility that observations of structure formation provide a sensitive probe of the cosmology and dark energy characteristics. In particular, dark energy with a time ...
متن کاملDark energy and cosmic sound
I describe how acoustic oscillations imprinted into the late-time correlations of galaxies by baryonic physics at the epoch of recombination can be used as a cosmological standard ruler. Measurements of this length scale by large galaxy surveys would allow us to compute the angular diameter distance to and Hubble parameter at the redshifts of the survey. This in turn offers a robust way to meas...
متن کاملA CMB/Dark Energy Cosmic Duality
We investigate a possible connection between the suppression of the power at low multipoles in the CMB spectrum and the late time acceleration. We show that, assuming a cosmic IR/UV duality between the UV cutoff and a global infrared cutoff given by the size of the future event horizon, the equation of state of the dark energy can be related to the apparent cutoff in the CMB spectrum. The prese...
متن کاملCosmic Acceleration, Dark Energy, and Fundamental Physics
A web of interlocking observations has established that the expansion of the Universe is speeding up and not slowing, revealing the presence of some form of repulsive gravity. Within the context of general relativity the cause of cosmic acceleration is a highly elastic (p " #!), very smooth form of energy called ‘‘dark energy’’ accounting for about 75% of the Universe. The ‘‘simplest’’ explanat...
متن کاملHolographic dark energy and late cosmic acceleration
It has been persuasively argued that the number of the effective degrees of freedom of a macroscopic system is proportional to its area rather than to its volume. This entails interesting consequences for cosmology. Here we present a model based on this “holographic principle” that accounts for the present stage of accelerated expansion of the Universe and significantly alleviates the coinciden...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2009
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.80.101302