Bouncing universes in string-inspired gravity

By Tirthabir Biswas, Anupam Mazumdar, W. Siegel. 2005

533 citations recorded by the source corpus.

We consider the effects on cosmology of higher derivative modifications of gravity that make it asymptotically free without introducing ghosts. The weakening of gravity at short distances allows pressure to prevent a singularity, producing a solution with contraction preceding expansion.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/9344ebdfe2170b6770d0b12da3f14e45e6f0b18b

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In Astronomy and Astrophysics

In Atomic and Molecular Physics, and Optics

In Nuclear and High Energy Physics

Citations in the corpus

Quadratic Gravity (2018, background): “Possibly the ghost can be avoided by introducing an infinite series of higher-derivative terms [11], which can be viewed as non-local terms, but the resulting gravity theories contain infinite free parameters and are not known to be renormalizable.”
Beyond the Cosmological Standard Model (2014, unknown): “It has been argued that higher-curvature theories can arise naturally from string theory under appropriate assumptons [356, 357].”
Higher derivative theories with constraints : Exorcising Ostrogradski's Ghost (2012, background): “In fact, f(R) can be recast as an (interacting) theory of a scalar and two graviton modes [16–21].”
The Matter Bounce Alternative to Inflationary Cosmology (2012, background): “Another example is the (non-local) action of [60] which was constructed to be ghost-free about Minkowski space-time.”
Towards a nonsingular bouncing cosmology (2012, background): “ca of either a ghost condensate construction [8], the ghostfree higher derivative gravity model of [9, 10], or Galileon fields [11, 12], and it arises in Horava-Lifshitz gravity [13] in the presence of spatial curvature [14, 15].”
Non-singular cosmology in a model of non-relativistic gravity (2009, background): “Another path to quantum gravity is to build a non-local theory [49], using infinite high-derivative terms [50–53], or string theory [54, 55], attempts which are still in proceeding.”
Matter bounce in Horava-Lifshitz cosmology (2009, background): “the special higher derivative gravitational action of [32] which is ghost-free about Minkowski space-time.”
Towards understanding the ultraviolet behavior of quantum loops in infinite-derivative theories of gravity (2014, background): “Accordingly, in [18, 19, 20] attempts were made to construct ghost-free, infinite-derivative theories of gravity which may be able to resolve space-time s ingularities such as the ones present inside the black holes and at the big bang.”