Towards singularity- and ghost-free theories of gravity.

By Tirthabir Biswas, E. Gerwick, Tomi Koivisto, Anupam Mazumdar. Physical Review Letters, 2011

625 citations recorded by the source corpus.

We present the most general covariant ghost-free gravitational action in a Minkowski vacuum. Apart from the much studied f(R) models, this includes a large class of nonlocal actions with improved UV behavior, which nevertheless recover Einstein's general relativity in the IR.

Subfields: Astronomy and Astrophysics, Mathematical Physics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/5f9d4d34ffe81b7cf207eeeabb3319caf874c330

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Citations in the corpus

Stable bounce and inflation in non-local higher derivative cosmology (2012, background): “A straight forward application of the results obtained in [14] tells us that for actions of the form (2.”
Hybrid Metric-Palatini Gravity (2015, neutral): “[72] and more pedagogically reviewed in Ref.”
Generalized ghost-free quadratic curvature gravity (2013, background): “y be possible to weaken gravitational interactions in a consistent manner at short distances and at early times. Indeed, recently it was shown by Biswas, Gerwick, Koivisto and Mazumdar (BGKM) in Ref. [10] that gravity in the UV can be made asymptotically free without violating basic principles of ph”
Born–Infeld inspired modifications of gravity (2017, background): “See for instance [71] for consistent theories including non-localities.”
Dark Energy in Light of Multi-Messenger Gravitational-Wave Astronomy (2018, neutral): “Non-local interactions have been also proposed as a means to improve the ultra-violet behavior of gravity (Biswas et al., 2012; Modesto, 2012; Calcagni and Modesto, 2015).”
Notes on nonsingular models of black holes (2016, background): “[6] Tirthabir Biswas, Erik Gerwick, Tomi Koivisto, and Anupam Mazumdar, “Towards singularity and ghost free theories of gravity,” Phys.”
Occurrence of exact R2 inflation in non-local UV-complete gravity (2016, background): “Moreover as opposite to GR or the local quadratic gravity in which understanding of stability has taken a long-time effort [33–37], the Minkowski vacuum is naturally stable in non-local gravity [24, 38, 39].”
New observational constraints on f(R) gravity from cosmic chronometers (2016, background): “Note that the latter approach has the additional advantage that it might improve renormalizability and thus alleviate the difficulties towards quantization [7, 8].”
On the quantum field theory of the gravitational interactions (2017, background): “Nonlocal theories of quantum gravity have also been explored [17, 18].”
f(T) teleparallel gravity and cosmology (2015, background): “On the other hand, the last two decades there is a huge effort in the literature to modify gravity [5] in order to be able to describe the observed universe evolution, as well as alleviate the non-renormalizability issues of GR [134, 135].”