The universe doesn't have a beginning or an end | Roger Penrose, Claudia de Rham, Karen Crowther

Quick Overview

Roger Penrose argues that the age of the universe, when discussed in cosmology, usually means the time since the Big Bang, but his theory suggests the Big Bang was not the beginning, proposing instead a cyclical model where the remote future of one cosmic eon becomes the Big Bang of the next, meaning the universe's age could effectively be infinite. The panel discusses the implications of this idea, particularly concerning the fate of mass and energy as the universe expands and cools towards a state where mass effectively disappears.

Key Points: Roger Penrose asserts that the commonly accepted 'age of the universe' (time since the Big Bang) is insufficient because the Big Bang was not the true beginning. Penrose promotes a cyclical model where the remote future of one cosmic eon becomes the Big Bang of the next, suggesting the universe's age could be infinite. The evidence for this cyclical model includes observations like large, distant galaxies (rings) that conventional cosmology suggests should not exist, implying they formed before our current Big Bang. Claudia de Rham notes that the concept of time (and thus age) breaks down when applied to the entire sequence of cosmic eons, making the question of the universe's age potentially meaningless. Karen Crowther expresses skepticism about framing the issue around the age of the universe, suggesting it is driven by a conceptual dissatisfaction with the standard model's prediction of an end state (cold, rarefied, no mass). Penrose explains that in the remote future, mass effectively fades away, leaving only photons, while the Big Bang was highly concentrated, dense, and hot, suggesting the two states are fundamentally different, though the crossover point is theorized. The discussion highlights that mass dictates the scale of time and space, and in the remote future, the loss of mass means a loss of scale.

Context: This video features a panel discussion hosted by the Institute of Art and Ideas (IAI) involving Nobel Laureate in Physics Roger Penrose, theoretical physicist Claudia de Rham, and philosopher of science Karen Crowther. The central topic revolves around Penrose's conformal cyclic cosmology (CCC) theory, which challenges the conventional understanding of the universe having a singular beginning (the Big Bang) by suggesting a series of preceding cosmic eons.