منابع مشابه
Dark Energy from Strings
A long-standing problem of theoretical physics is the exceptionally small value of the cosmological constant Λ ∼ 10−120 measured in natural Planckian units. Here we derive this tiny number from a toroidal string cosmology based on closed strings. In this picture the dark energy arises from the correlation between momentum and winding modes that for short distances has an exponential fall-off wi...
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We consider the effect of inhomogeneities on the expansion of the Einstein-de Sitter universe. We find that the backreaction of linear scalar metric perturbations results in apparent dark energy with a mixture of equations of state between 0 and –4/3. We discuss the possibility that backreaction could account for present-day acceleration.
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In a model recently proposed by Albrecht and Skordis it was suggested that the observed accelerated expansion of the universe could be caused by a scalar field which is trapped in a local minimum of an exponential potential modified by a polynomial prefactor. We show that scalar field cosmologies with this kind of local minimum in the potential are stable and do not decay to the true vacuum if ...
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It is found that dark energy consists of gravitationally repulsive antimatter. The implications are discussed. A solar system proof is provided.
متن کاملCondensate cosmology: Dark energy from dark matter
Bruce A. Bassett, Martin Kunz, David Parkinson and Carlo Ungarelli Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 2EG, UK Astrophysics, Department of Physics, 1 Keble Road, Oxford University, Oxford OX1 3RH, UK Astronomy Centre, CPES, University of Sussex, Brighton, BN1 9QJ, UK School of Physics and Astronomy, University of Birmingham Edgbaston, Birmingham, B15...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2020
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2020/03/020