Does holographic equipartition demand a pure cosmological constant?
نویسندگان
چکیده
منابع مشابه
Probable values of the cosmological constant in a holographic theory
We point out that for a large class of universes, holography implies that the most probable value for the cosmological constant is zero. In four space-time dimensions, the probability distribution takes the Baum-Hawking form, dP approximately exp(cM(2)(p)/Lambda)dLambda.
متن کاملProposal for a Constant Cosmological Constant
It is proposed that the apparent positive acceleration of the cosmological scale factor is due to the vacuum energy of an incomplete chiral phase transition in a hidden SU(2) sector. Constraints from primordial nucleosynthesis imply that the present metastable phase is in a substantially supercooled state. It is argued that massless chiral condensates can substantially enhance the possibility o...
متن کاملCosmological Constant ?
We prove that a class of one-loop partition functions found by Dienes, giving rise to a vanishing cosmological constant to one-loop, cannot be realized by a consistent lattice string. The construction of non-supersymmetric string with a vanishing cosmological constant therefore remains as elusive as ever. We also discuss a new test that any one-loop partition function for a lattice string must ...
متن کاملDoes the fine-structure constant vary with cosmological epoch?
We use the strong nebular emission lines of O iii, 5007 Å and 4959 Å, to set a robust upper limit on the time dependence of the fine structure constant. We find |α−1dα(t)/dt| < 2 × 10−13 yr−1, corresponding to ∆α/α(0) = (0.7± 1.4) × 10−4 for quasars with 0.16 < z < 0.80 obtained from the SDSS Early Data Release. Using a blind analysis, we show that the upper limit given here is invariant with r...
متن کاملA new cosmological constant model
We propose a new cosmological model with a time-dependent cosmological constant (Λ ∝ 1/t), which starting at the Planck time as ΛP l ∼ M P l, evolves to the present-day allowed value of Λ0 ∼ 10M P l. This scenario is supported by non-critical string theory considerations. We compute the age of the Universe and the time-dependence of the scale factor in this model, and find general agreement wit...
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: Modern Physics Letters A
سال: 2020
ISSN: 0217-7323,1793-6632
DOI: 10.1142/s0217732320503344