Gravity is supposed to be the most familiar force in nature, yet at the deepest level it remains the least understood. A bold ...

When speaking of our universe, it's often said that "matter tells spacetime how to curve, and curved spacetime tells matter how to move." This is the essence of Albert Einstein's famous general theory ...

Lorentzian geometry forms the mathematical cornerstone of modern spacetime theory by providing a framework in which the causal structure and metric properties of the universe can be rigorously ...

The rapid acceleration of the universe’s expansion continues to challenge our understanding of fundamental physics. Why the universe is expanding faster and faster remains one of the most intriguing ...

The accelerating expansion of the universe is usually explained by an invisible force known as dark energy. But a new study ...

The standard explanation has been dark energy, an invisible force added into the equations to make the math work. But now, an ...