Tag

Generalrelativity

All articles tagged with #generalrelativity

science28 days ago•9 min saved

Elevator-Test Claims Gravity Changes Light Speed, Rekindling Einstein’s 1911 Idea

Physicist Enbang Li at the University of Wollongong has built a gravity-based test in an elevator shaft to detect variations in the speed of light, arguing that gravity can speed up light on local scales and reviving Einstein’s 1911 notion that c might vary with gravity. General relativity holds that the speed of light is constant locally, so Li’s claims, if validated, would challenge a foundational assumption and could have implications for Earth science applications; the result remains a subject of scrutiny and replication.

via ZME Science|

#einstein #experiment #generalrelativity

science1 year ago•10 min saved

Reevaluating Emergent Gravity: A Worthy Concept Despite Challenges

Emergent gravity, a theory suggesting gravity is an emergent property rather than a fundamental force, has faced challenges in explaining cosmic phenomena like dark matter. While it offers an innovative perspective by linking gravity to thermodynamics and quantum information, it has struggled to match the predictive power of general relativity and dark matter models. Despite its current shortcomings, emergent gravity remains a valuable concept for exploring new physics, potentially leading to future breakthroughs in understanding the universe.

via Ars Technica|

#darkmatter #emergentgravity #generalrelativity

science-and-technology2 years ago•3 min saved

"Exploring Black Hole Mysteries: Size Differences and Misconceptions"

Carlo Rovelli challenges common misconceptions about black holes, explaining that the singularity is not located at the center but rather in the future, as the funnel-shaped interior of a black hole stretches and narrows over time. Contrary to popular belief, the center of a black hole contains the collapsing star, not the singularity. The true singularity, where Einstein's equations fail and quantum effects dominate, lies in the future where the funnel's narrowing leads to infinite distortion of space-time. This insight is crucial for understanding the true nature of black holes and their singularities.

via IAI|

##blackholes #carlorovelli

science-and-technology2 years ago•5 min saved

"Exploring the Mysteries of Black Hole Size, Appearance, and Time Dilation"

The center of a black hole, known as the singularity, is a theoretical point where mass is thought to be compressed to zero volume, implying infinite density, which suggests a breakdown of our current understanding of physics. The event horizon marks the boundary beyond which nothing can escape the black hole's gravitational pull. While general relativity predicts the existence of singularities, it is believed to fail at describing the true nature of a black hole's center, indicating the need for a new theory of quantum gravity. The reality inside a black hole remains speculative and may forever be beyond our empirical understanding.

via Big Think|

##blackhole #eventhorizon