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pro vyhledávání: '"Nersisyan, Henrik"'
We study the cosmology of a specific class of nonlocal model of modified gravity, the so-called Deser-Woodard (DW) model, modifying the Einstein-Hilbert action by a term $\sim R f(\Box^{-1}R)$, where $f$ is a free function. Choosing $f$ so as to repr
Externí odkaz:
http://arxiv.org/abs/1901.07832
The recent report that the gravitational wave speed equals the light speed puts strong constraints on the anisotropic stress parameter of many modified gravity models, a quantity that is directly observable through large-scale structure. We show here
Externí odkaz:
http://arxiv.org/abs/1801.06683
Publikováno v:
Phys. Rev. D 96, 084031 (2017)
We consider a nonlocal gravity model motivated by nonperturbative Quantum Gravity studies. This model, if correct, suggests the existence of strong IR relevant effects which can lead to an interesting late time cosmology. We implement the IR modifica
Externí odkaz:
http://arxiv.org/abs/1707.04628
In this work, we extend previous analyses of the structure formation in the $f(\Box^{-1}R)$ model of nonlocal gravity proposed by Deser and Woodard (DW), which reproduces the background expansion of $\Lambda$CDM with no need of a cosmological constan
Externí odkaz:
http://arxiv.org/abs/1701.00434
Autor:
Nersisyan, Henrik, Akrami, Yashar, Amendola, Luca, Koivisto, Tomi S., Rubio, Javier, Solomon, Adam R.
Publikováno v:
Phys. Rev. D 95, 043539 (2017)
We discuss the cosmological implications of nonlocal modifications of general relativity containing tensorial structures. Assuming the presence of standard radiation- and matter-dominated eras, we show that, except in very particular cases, the nonlo
Externí odkaz:
http://arxiv.org/abs/1610.01799
Publikováno v:
Phys. Rev. D 94, 043531 (2016)
We discuss the cosmological implications of the $R~\Box^{-2}R$ nonlocal modification to standard gravity. We relax the assumption of special initial conditions in the local formulation of the theory, perform a full phase-space analysis of the system,
Externí odkaz:
http://arxiv.org/abs/1606.04349
Publikováno v:
Journal of High Energy Physics, 2016(11), 1-26
Many theories of modified gravity with higher order derivatives are usually ignored because of serious problems that appear due to an additional ghost degree of freedom. Most dangerously, it causes an immediate decay of the vacuum. However, breaking
Externí odkaz:
http://arxiv.org/abs/1605.08757
Publikováno v:
Phys. Rev. D 92, 104034 (2015)
Massive bigravity models are interesting alternatives to standard cosmology. In most cases, however, these models have been studied for a simplified scenario in which both metrics take homogeneous and isotropic forms [Friedmann-Lema\^itre-Robertson-W
Externí odkaz:
http://arxiv.org/abs/1502.03988
Autor:
Nersisyan, Henrik
Nichtlokale Gravitationstheorien sind Versuche Quantenkorrekturen in die Einstein-Hilbert-Wirkung miteinzubeziehen. Dies ist ein eleganter Weg, um offene Fragen der Allgemeinen Relativitätstheorie anzugehen. In dieser Dissertation haben wir hauptsä
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5fce03ade0cbfaf0947d208c58ddae57
http://archiv.ub.uni-heidelberg.de/volltextserver/23652/
http://archiv.ub.uni-heidelberg.de/volltextserver/23652/
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