Cosmological Constant From Degenerate Vacua
نویسندگان
چکیده
منابع مشابه
A cosmological constant from degenerate vacua
Under the hypothesis that the cosmological constant vanishes in the true ground state with lowest possible energy density, we argue that the observed small but finite vacuum-like energy density can be explained if we consider a theory with two or more degenerate perturbative vacua, which are unstable due to quantum tunneling, and if we still live in one of such states. An example is given makin...
متن کاملCosmological Constant in SUGRA Models Inspired by Degenerate Vacua
Present astrophysical and cosmological observations indicate that there is a tiny energy density (the cosmological constant) Λ ∼ 10M Pl ∼ 10 M Z spread all over the Universe, which is responsible for its accelerated expansion. This energy density is incredibly small as compared with the contribution of QCD condensates to the total vacuum energy density, which is expected to be of order ΛQCD ≃ 1...
متن کاملThe Cosmological Constant, False Vacua, and Axions
It is suggested that the true ground state of the world has exactly vanishing vacuum energy and that the cosmological constant that seems to have been observed is due to our region of the universe being stuck in a false vacuum, whose energy is split from the true vacuum by non-renormalizable operators that are suppressed by powers of the Planck scale. It is shown that conventional invisible axi...
متن کاملCosmological constant in SUGRA models with Planck scale SUSY breaking and degenerate vacua
Article history: Received 10 May 2014 Received in revised form 4 July 2014 Accepted 12 August 2014 Available online 15 August 2014 Editor: M. Cvetič The empirical mass of the Higgs boson suggests small to vanishing values of the quartic Higgs selfcoupling and the corresponding beta function at the Planck scale, leading to degenerate vacua. This leads us to suggest that the measured value of the...
متن کاملOn the Smallness of the Cosmological Constant in SUGRA Models Inspired by Degenerate Vacua
In the no–scale supergravity global symmetries protect local supersymmetry and a zero value for the cosmological constant. The breakdown of these symmetries, which ensures the vanishing of the vacuum energy density, results in a set of degenerate vacua with broken and unbroken supersymmetry leading to the natural realisation of the multiple point principle (MPP). In the MPP inspired SUGRA model...
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: Physical Review Letters
سال: 2002
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.88.151302