How to hide a cosmological constant

نویسندگان

چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

How natural is a small but nonzero cosmological constant?

Based on our previous attempt, we propose a better way to understand a small but nonzero cosmological constant, as indicated by a number of recent observational studies. We re-examine the assumptions of our model of two scalar elds, trying to explain the basic mechanism resulting in a series of mini-in ations occuring nearly periodically with respect to ln t with t the cosmic time. We also disc...

متن کامل

A Solution to the Cosmological Constant Problem

The fluctuations of the vacuum energy are treated as a non-equilibrium process and a stochastic model for the cosmological constant is presented, which yields a natural explanation for the smallness or zero value of the constant in the present epoch and its large value in an era of inflation in the early universe. Typeset using REVTEX 1 It is widely considered that the problem of the cosmologic...

متن کامل

A Solution to the Cosmological Constant Problem

The status of the cosmological constant Λ has long been discussed, whereas it is clearly established in General Relativity (GR) as universal constant. Therefore, similarly to Newton constant of gravitation G, its value has to be estimated from observations. However, such an estimate does not agree by hundred orders of magnitude with its expected value as obtained from quantum field theories by ...

متن کامل

Proposal 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 کامل

Cosmological 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 کامل

ذخیره 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: International Journal of Modern Physics D

سال: 2019

ISSN: 0218-2718,1793-6594

DOI: 10.1142/s0218271819430041