This is why I believe that the future already exists

Quick Overview

The speaker argues that Einstein's theory of relativity, which separates past, present, and future into a fixed block universe where all moments exist simultaneously, is a more accurate description of reality than our intuitive perception of time flowing, a concept further complicated by the non-deterministic nature of quantum mechanics.

Key Points: Einstein's theory of relativity implies that past, present, and future all exist simultaneously in a fixed 'block universe'. Our intuitive perception that the present is special and the future is open is misleading, as relativity suggests all moments are equally real. The concept of simultaneity is relative; different observers moving at different speeds will disagree on whether two events happened at the same time (e.g., the two flashes example). The speed of light in a vacuum (c) is constant for all inertial observers, defining the boundaries of the light cone, which separates the past and future. Quantum mechanics introduces indeterminism, meaning we cannot predict the exact outcome of a measurement, only the probability, which conflicts with the determinism implied by the block universe. The speaker, Sabine Hossenfelder, supports the block universe view, which she finds more consistent than trying to force quantum mechanics into a concept of changing time. The speaker encourages viewers to support Planet Wild, which funds environmental missions like ocean plastic cleanup and forest restoration, offering a free month for using the code SABINE41.

Context: The speaker, Sabine Hossenfelder (whose book "Existential Physics" is briefly displayed), explores the philosophical implications of Einstein's Special Relativity concerning the nature of time, contrasting the scientific view of a fixed spacetime continuum with our common human experience of a flowing, open future. She uses a spacetime diagram to illustrate how different observers perceive simultaneity differently, and then brings in quantum mechanics to further complicate the discussion on determinism versus probability.