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Dynamical Systems Approach to Interacting Dark Energy Models

Pirayesh, Behnam | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55322 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Abolhassani, Aliakbar
  7. Abstract:
  8. This thesis studies the possible solution to the H0 tension via a dynamical systems approach. The early dark energy (IDE) scenario can somewhat alleviate the Hubble constant tension. On the other hand, postulating a new subdominant EDE in the pre – recombination Universe can also resolve the H0 tension. We introduce a novel model to interweave the early dark energy(EDE) and interacting dark energy-dark matter (IDE) scenarios. In this scenario, the early dark energy emerges naturally by changing the topological class of the phase portrait of the universe dynamics. In particular, an EDE component contributing only 10% of the matter density of the Universe—preferably in the vicinity of the matter/radiation equality-- can ease the Hubble tension. We show that by considering a particular IDE, the EDE component can naturally emerge in this model to solve the Hubble tension
  9. Keywords:
  10. Dynamical Systems ; Hubble Constant Stress ; Early Dark Energy (EDE) ; Dark Energy-Dark Matter Interaction ; Topological Class ; Cosmology Standard Model

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