General relativity Quote by Max Tegmark
““Again Einstein comes to the rescue with a loophole, this time from his general relativity theory, which says that gravity is caused not only by mass, but also by pressure. Since mass can’t be negative, the gravity from mass is always attractive. But positive pressure also causes attractive gravity, which means that negative pressure causes repulsive gravity!””
About This Quote
Source Lecture: Cosmology and Fundamental Physics, MIT, 2018
He explains that pressure, like mass, contributes to gravity, and that negative pressure can produce repulsive gravitational effects, a concept used in cosmology
In simple terms: Pressure can affect gravity; negative pressure can cause repulsion
Key Takeaway
Explore the implications of negative pressure in cosmology
Themes
physics
cosmology
gravity
theory
Mood
inquisitive
thoughtful
Type
scientific
educational
When to use this quote
- academic lecture
- science podcast
- research paper
Key Concepts
negative pressure
dark energy
general relativity
Questions to Reflect On
- What does repulsive gravity mean for universe expansion?
- How does this concept relate to dark energy?
A Different Perspective
Negative pressure is hard to observe directly
![“Einstein, my upset stomach hates your theory [of General Relativity]—it almost hates you yourself! How am I to' provide for my students? What am I to answer to the philosophers?!!” quote by Paul Ehrenfest](https://sms4smile.com/quotes/img-quotes/8bf/paul-ehrenfest-52330_answers_einstein-my-upset-stomach-hates-your-the_467759.jpg)
