Introduction to Particle Physics and the Early Universe

How did the universe transition from an incredibly hot, dense point into the vast cosmos we see today? To find the answer, we must look at the intersection of cosmology and quantum-scale particle physics. This text-based course guides you through the foundational theories and concepts that explain the early moments of our universe, helping you connect subatomic interactions with cosmic evolution. By reading through this course, you will transition from understanding basic cosmology to analyzing advanced concepts like cosmic inflation, phase transitions, and dark matter candidates. You will gain a solid conceptual framework for how high-energy physics governs the history of space and time. What you'll learn: - Understand the core concepts of general relativity and standard Big Bang cosmology. - Explore the thermodynamics of the early universe and the origin of cosmic microwave background radiation. - Analyze the Standard Model of particle physics and its role in primordial nucleosynthesis. - Examine grand unified theories, electroweak phase transitions, and the mystery of baryon asymmetry. - Investigate cosmic inflation, topological defects like cosmic strings, and modern dark matter candidates like axions. - Learn how modern observational cosmology and gravitational wave concepts support these theoretical models. The course begins with essential terminology and foundational physics before moving step-by-step through cosmic history, phase transitions, and modern theoretical developments. It is designed for curious learners, science enthusiasts, and introductory physics students looking for a comprehensive, beginner-friendly entry point into early-universe cosmology without needing advanced mathematical prerequisites. Start your journey into the quantum origins of our universe today.