Event Details

Speaker: Hassan Amirhashchi, University of Bristol Title: Anisotropy and Dark Energy: A Complex Relationship

Abstract: The standard cosmological model, predicated on the cosmological principle of homogeneity and isotropy, provides a robust framework for understanding the universe’s evolution. However, recent observations have begun to challenge this paradigm, suggesting potential deviations from these assumptions. Among these, anisotropy, the directional dependence of cosmological parameters, has emerged as a subject of growing interest and complexity. Dark energy, the enigmatic component driving the accelerated expansion of the universe, plays a pivotal role in the standard model. However, its precise nature remains elusive. In this seminar we explore the intricate relationship between these two fundamental aspects of cosmology: anisotropy and dark energy. By relaxing the assumptions of homogeneity and isotropy, we delve into the realm of anisotropic cosmological models. These models offer a fertile ground to investigate potential modifications to the properties of dark energy. We explore how anisotropy can impact the equation of state of dark energy, a crucial parameter characterizing its behavior. Additionally, we examine the implications of anisotropic dark energy models on the evolution of the universe, including their influence on structure formation and the late-time acceleration. A key challenge lies in distinguishing between anisotropic effects and intrinsic properties of dark energy. Observational constraints from various cosmological probes, such as the Cosmic Microwave Background (CMB), largescale structure, and supernovae, are crucial for disentangling these effects. We discuss the potential of these observations to shed light on the complex interplay between anisotropy and dark energy. By investigating the connections between anisotropy and dark energy, we aim to contribute to a deeper understanding of the universe’s evolution and the nature of its constituents. This talk has the potential to reshape our cosmological paradigm and provide new insights into the fundamental laws governing the cosmos.