# Simple-graduated dark energy and spatial curvature

@article{Acquaviva2021SimplegraduatedDE, title={Simple-graduated dark energy and spatial curvature}, author={Giovanni Acquaviva and {\"O}zg{\"u}r Akarsu and Nihan Katırcı and Jose Alberto V{\'a}zquez}, journal={Physical Review D}, year={2021} }

In this work, we first discuss the possibility that dark energy models with negative energy density values in the past can alleviate the H0 tension, as well as the discrepancy with the baryon acoustic oscillation (BAO) Lyman-α data, both which prevail within the ΛCDM model. We then investigate whether two minimal extensions of the ΛCDM model, together or separately, can successfully realize such a scenario: (i) the spatial curvature, which, in the case of spatially closed universe, mimics a…

## 6 Citations

### Is the dark energy equation of state parameter singular?

- Physics
- 2022

A dark energy with a negative energy density in the past can simultaneously address various cosmological tensions, and if it is to be positive today to drive the observed acceleration of the…

### Dynamical Analysis of Logarithmic Energy-Momentum Squared Gravity

- PhysicsSSRN Electronic Journal
- 2022

We perform the dynamical system analysis of a cosmological model in the energy-momentum squared gravity (EMSG) of the form f ( T µν T µν ) = α ln( λT µν T µν ), which is known as energy-momentum log…

### Effect of peculiar velocities of inhomogeneities on the shape of gravitational potential in spatially curved universe

- PhysicsPhysics Letters B
- 2022

### Testing spatial curvature and anisotropic expansion on top of the $\Lambda$CDM model

- Education
- 2021

We explore the possible advantages of extending the standard Λ CDM model by more realistic backgrounds compared to its spatially ﬂat Robertson-Walker (RW) spacetime assumption, while preserving the…

### ΛsCDM model: ΛCDM model with a sign switching cosmological ‘constant’

- Materials Science
- 2021

Özgür Akarsu, ∗ Suresh Kumar, † Emre Özülker, 3, ‡ and J. Alberto Vazquez § Department of Physics, Istanbul Technical University, Maslak 34469 Istanbul, Turkey Department of Mathematics, Indira…

### Relaxing cosmological tensions with a sign switching cosmological constant

- PhysicsPhysical Review D
- 2021

We present a further observational analysis of the Λ s CDM model proposed in Akarsu et al. [Phys. Rev. D 104, 123512 (2021)]. This model is based on the the recent conjecture suggesting the universe…

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