Strong evidence for an accelerating Universe
نویسندگان
چکیده
منابع مشابه
Evidence from Type Ia Supernovae for an Accelerating Universe
We review the use of Type Ia supernovae for cosmological distance determinations. Low-redshift SNe Ia (z ∼ 0.1) demonstrate that the Hubble expansion is linear, that H0 = 65 ± 2 (statistical) km s −1 Mpc, and that the properties of dust in other galaxies are similar to those of dust in the Milky Way. We find that the light curves of high-redshift (z = 0.3–1) SNe Ia are stretched in a manner con...
متن کاملScalar field models for an accelerating universe
I describe a new class of quintessence+CDMmodels in which late time scalar field oscillations can give rise to both quintessence and cold dark matter. Additionally, a versatile ansatz for the luminosity distance is used to reconstruct the quintessence equation of state in a model independent manner from observations of high redshift supernovae. 1. A new model of quintessence and cold dark matte...
متن کاملTensorial Perturbations in an Accelerating Universe
We study tensorial perturbations (gravitational waves) in a universe with particle production (OSC). The background of gravitational waves produces a perturbation in the redshift observed from distant sources. The modes for the perturbation in the redshift(induced redshift) are calculated in a universe with particle production.
متن کاملTring Theory and an Accelerating Universe
An accelerating Universe can be accommodated naturally within non-critical string theory, in which scattering is described by a superscattering matrix $ that does not factorize as a product of Sand S †-matrix elements and time evolution is described by a modified Liouville equation characteristic of open quantum-mechanical systems. We describe briefly alternative representations in terms of the...
متن کاملGrowth index in an accelerating universe
We obtain the exact analytic form of growth index (f = Ωm(a) ) at present epoch in a flat universe with including the constant equation of state of dark energy (ωde). For the cosmological constant (ωde = −1) we obtain γ = 0.5547 which is very close to the well known value 6/11. However, if ωde = −0.9, then γ gives rise to 0.6405. Ω 0 m dependence of γ is fairly small for the viable range of the...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2017
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201730469