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[post_content] => Abstract: I will review aspects of the exact $\\Lambda$CDM-like cosmological solution, which is specified by the cosmographic solution $j(z)=1$ ($j$=cosmographic jerk parameter), within the framework of modified gravity theories. Although the CDM model is at a supposed disadvantage in comparis.on with a dynamical dark energy scenario when constrained through a -parametrization, model-independent approaches, at least up until now, indicate a far lighter tension. In that regard, the question of whether a cosmic evolution exactly similar to a $\\Lambda$CDM model can be achieved within the framework of a modified gravity theory is still pertinent. The existence of such solutions within a particular class of modified gravity theories is typically explored through the reconstruction method, of which I will present some examples from the literature. However, I will delve into deeper questions like the stability of such solutions within a modified gravity framework, GR being a cosmological past or future attractor, and the possibility of distinctive signatures at the perturbation level. The methodology developed to answer these questions can later on be useful to investigate the same aspects of not an exact $\\Lambda$CDM-like, but an almost $\\Lambda$CDM-like cosmic evolution within the modified gravity framework, which is a more realistic situation.
About the Speaker: Saikat Chakraborty has obtained his MSc and PhD in Physics, both from IIT Kanpur in 2014 and 2019 respectively. Then he served for 2 years as a postdoctoral researcher at Yangzhou University in China, 3 months as a visiting researcher in BITS-Pilani, 6 months as a postdoctoral researcher at North-West University in South Africa and a little more than 2 years as a postdoctoral researcher at the Institute for Fundamental Study in Thailand. Currently, he ia a postdoctoral researcher at the Chulalongkorn University in Thailand. Saikat's broad area of research is gravitation and cosmology, with specialization, as of now, being mainly cosmological aspects of modified gravity theories.
We look forward to your active participation.
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[post_content] => Abstract: I will review aspects of the exact $\\Lambda$CDM-like cosmological solution, which is specified by the cosmographic solution $j(z)=1$ ($j$=cosmographic jerk parameter), within the framework of modified gravity theories. Although the CDM model is at a supposed disadvantage in comparis.on with a dynamical dark energy scenario when constrained through a -parametrization, model-independent approaches, at least up until now, indicate a far lighter tension. In that regard, the question of whether a cosmic evolution exactly similar to a $\\Lambda$CDM model can be achieved within the framework of a modified gravity theory is still pertinent. The existence of such solutions within a particular class of modified gravity theories is typically explored through the reconstruction method, of which I will present some examples from the literature. However, I will delve into deeper questions like the stability of such solutions within a modified gravity framework, GR being a cosmological past or future attractor, and the possibility of distinctive signatures at the perturbation level. The methodology developed to answer these questions can later on be useful to investigate the same aspects of not an exact $\\Lambda$CDM-like, but an almost $\\Lambda$CDM-like cosmic evolution within the modified gravity framework, which is a more realistic situation.
About the Speaker: Saikat Chakraborty has obtained his MSc and PhD in Physics, both from IIT Kanpur in 2014 and 2019 respectively. Then he served for 2 years as a postdoctoral researcher at Yangzhou University in China, 3 months as a visiting researcher in BITS-Pilani, 6 months as a postdoctoral researcher at North-West University in South Africa and a little more than 2 years as a postdoctoral researcher at the Institute for Fundamental Study in Thailand. Currently, he ia a postdoctoral researcher at the Chulalongkorn University in Thailand. Saikat's broad area of research is gravitation and cosmology, with specialization, as of now, being mainly cosmological aspects of modified gravity theories.
We look forward to your active participation.
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