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Equation of State for Dark Energy in Modified Gravity Theories
Modified theories of gravity Dark energy Cosmology
2012/2/21
We explore the equation of state (EoS) for dark energy $w_{\mathrm{DE}}$ in modified gravitational theories to explain the current accelerated expansion of the universe. We explicitly demonstrate that...
Interacting dark matter and modified holographic Ricci dark energy induce a relaxed Chaplygin gas
interaction modifi ed Ricci’s cutoff dark energy dark matter relaxed Chaplygin gas
2011/10/13
We investigate a model of interacting dark matter and dark energy given by a modified holographic Ricci's cutoff in a spatially flat Friedmann-Robertson-Walker (FRW) space-time. We consider a non line...
Modified gravity approach based on a preferred time foliation
Modified gravity approach based preferred foliation
2011/10/14
We propose, in a heuristic way, a relativistic modified gravity model as an alternative to particle dark matter at galactic scales. The model is based on a postulated preferred time foliation describe...
A modified star formation law as a solution to open problems in galaxy evolution
galaxies: evolution – galaxies: formation – galaxies: stellar content –galaxies: haloes
2011/10/13
In order to reproduce the low mass end of the stellar mass function, most current models of galaxy evolution invoke very efficient supernova feedback. This solution seems to suffer from several shortc...
Beyond Einstein: Cosmological Tests of Model Independent Modified Gravity
Beyond Einstein: Cosmological Model Independent Modified Gravity
2011/10/8
Model-independent parametrisations of modified gravity have attracted a lot of attention over the past few years; numerous combinations of experiments and observables have been suggested to constrain ...
Testing model independent modified gravity with future large scale surveys
Testing model independent modified gravity future large scale surveys
2011/9/27
Model-independent parametrisations of modified gravity have attracted a lot of attention over the past few years and numerous combinations of experiments and observables have been suggested to constra...
Towards a fully consistent parameterization of modified gravity
fully consistent parameterization modified gravity
2011/9/27
There is a distinct possibility that current and future cosmological data can be used to constrain Einstein's theory of gravity on the very largest scales. To be able to do this in a model-independent...
Towards a fully consistent parameterization of modified gravity
fully consistent parameterization modified gravity
2011/9/27
There is a distinct possibility that current and future cosmological data can be used to constrain Einstein's theory of gravity on the very largest scales. To be able to do this in a model-independent...
Testing Modified Gravity with Gravitational Wave Astronomy
Testing Modified Gravity Gravitational Wave Astronomy
2011/1/13
The emergent area of gravitational wave astronomy promises to provide revolutionary discoveries in the areas of astrophysics, cosmology, and fundamental physics. One of the most exciting possibilities...
Future proposed satellite missions as Euclid can offer the opportunity to test general relativity on cosmic scales through mapping of the galaxy weak lensing signal. In this paper we forecast the abil...
Goldstone's Theorem and Hamiltonian of Multi-galileon Modified Gravity
Goldstone's Theorem Hamiltonian of Multi-galileon Modified Gravity
2010/11/16
The galileon model was recently proposed to locally describe a class of modi ed gravity theories,including the braneworld DGP model. We discuss spontaneous symmetry breaking of the self-accelerating b...
Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
Unified cosmic history theory Lorentz non-invariant models
2010/11/16
Classical generalization of general relativity is considered as gravitational alternative for unified description of the early-time inflation with late-time cosmic acceleration. The structure and cosm...
Topology of large scale structure as test of modified gravity
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/5
The genus of the iso-density contours is a robust measure of the topology of large-scale structure, and relatively insensitive to galaxies biasing and redshift-space distortions. We show that the grow...
External field effect of modified Newtonian dynamics in the Solar system
Cosmology and Extragalactic Astrophysics (astro-ph.CO) General Relativity and Quantum Cosmology (gr-qc)
2010/12/27
The Modified Newtonian Dynamics (MOND) has been formulated as a modification of the Poisson equation for the Newtonian gravitational field.
On the Modified Random Walk for Monte-Carlo Radiation Transfer
Instrumentation and Methods for Astrophysics
2010/12/22
Min et al. (2009) presented two complementary techniques that use the diffusion approximation to allow efficient Monte-Carlo radiation transfer in very optically thick regions: a modified random walk ...