Differences

This shows you the differences between two versions of the page.

--- courses:ast100:1.1 [2026/01/20 12:07] – asad
+++ courses:ast100:1.1 [2026/01/26 11:50] (current) – asad
@@ Line 1: / Line 1: @@
-====== The Four Fundamental Forces ======
+====== 1.1. The Four Fundamental Forces ======
-The evolution of the four fundamental forces began at the Big Bang ($t=0$), a state of infinite density and temperature. During the **Planck Epoch** ($0$ to $10^{-43}$ seconds), the universe was a chaotic quantum foam spanning merely $10^{-35}$ meters (the Planck length) with temperatures exceeding $10^{32}$ Kelvin, where all forces were unified in a single "Superforce". At $10^{-43}$ seconds, **gravity** became the first to separate from the others. Around $10^{-35}$ seconds, as the universe cooled to $10^{28}$ Kelvin, the **Strong Nuclear Force** separated, an event associated with the release of energy that drove cosmic **inflation**. Finally, at $10^{-12}$ seconds ($1$ picosecond) and $10^{15}$ Kelvin, the **Electroweak force** split into **Electromagnetism** and the **Weak Nuclear Force**.
+{{:courses:ast100:forces.jpg?nolink|}}
+The evolution of the four fundamental forces began at the Big Bang ($t=0$), a state of infinite density and temperature. During the Planck Epoch ($0$ to $10^{-43}$ seconds), the universe was a chaotic quantum foam spanning merely $10^{-35}$ meters (the Planck length) with temperatures exceeding $10^{32}$ Kelvin, where all forces were unified in a single "Superforce". At $10^{-43}$ seconds, **Gravitational Force** or gravity became the first to separate from the others. Around $10^{-35}$ seconds, as the universe cooled to $10^{28}$ Kelvin, the **Strong Nuclear Force** separated, an event associated with the release of energy that drove cosmic inflation. Finally, at $10^{-12}$ seconds ($1$ picosecond) and $10^{15}$ Kelvin, the Electroweak force split into **Electromagnetic Force** and the **Weak Nuclear Force**.
 Physicists describe the separation of these forces using the analogy of "freezing" or a phase transition, similar to liquid water turning into ice. In the extreme heat of the early universe, the forces were symmetric and indistinguishable, much like the uniformity of liquid water. As the cosmos expanded and cooled, it passed through critical thresholds where this symmetry was spontaneously broken. Just as cooling water releases latent heat and crystallizes into distinct structures, the cooling universe underwent phase transitions that allowed the unified forces to "freeze out" into the distinct, asymmetric identities we observe today. This process explains why the universe currently operates under four distinct sets of physical laws rather than one.
@@ Line 12: / Line 14: @@
 In modern physics, a force is not merely a "push" or "pull" but the mechanism by which the universe manages energy distribution. At the quantum level, forces are exchanges of information and momentum mediated by "carrier" particles called **bosons**, creating **fields** that permeate space and store **potential energy**. The relationship between force and energy can be visualized as a slope: a force is effectively the "gradient" of a potential energy field. Just as a ball rolls down a hill to minimize its gravitational potential energy, particles are "pushed" by forces toward states of lower potential energy. Thus, when a particle interacts with a field, it exchanges potential energy for kinetic energy, manifesting as the physical force we observe acting over a distance.
+{{:courses:ast100:forces_detailed.webp?direct|}}