Podcast on Cosmology and Particle Physics | Cosmology for Beginners | Podcast on Physics

[@abinashkumarsingh-kolkata]

Very interesting discussions...

[@lokeshraybarman7007]

It's a wonderful discussion ❤❤❤1)I just stand in awe in front of such an insightful discussion of learned man and woman and note down certain terms like " inflation", " secondary Higgs boson and names of books etc❤❤❤.... 2) one question that disturbs my mind is that if space time is being stretched...then what is that system in which is it being stretched???.....for example..if I am stretching a rubber then it is being stretched in the room...what is the equivalent of room in context of galaxy and space time???? 3) I didn't notice previously there's a beautiful playlist on the explanation of Tagore Einstein conversation ❤❤❤thanks you for that also❤❤🎉🎉 and happy new year in advance 🎇😁🎇🎇

[@physicsforstudents]

@@lokeshraybarman7007 Tagore Einstein conversation is one of my best philosophical topic. Science and religion met at one place. You can listen to that. I would be happy.

[@lokeshraybarman7007]

@@physicsforstudents can you pls shed some light on the second question if possible???

[@NEO24ification]

31:11: I don't thik "spacetime" is the correct choice of word. It is the space which is expanding. It is evident from the spatial part of the FRW metric, where we have a scale factor sitting in the space part. This scale factor evolves with time and describes the expansion of space. Phrase like "spacetime is expanding" is misleading. This might imply that the entire 4D structure is stretching, which isn't. The evolution of the universe is a process occurring within spacetime, where spatial separations grow over time. Secondly, I think the answer demands a second part : "what is expanding in reality?" it is the distances between galaxies (or clusters of galaxies) are increasing over time, not because galaxies are moving through space, but because the very fabric of space between them is stretching. Imagine dots on the surface of a balloon. As the balloon inflates, the dots move farther apart, not because they are moving along the balloon’s surface, but because the surface itself is expanding. In a more concrete sense, the "comoving" distance between two points is not changing, it is the "physical" distance which is getting larger. And how do we know that? by measuring the Hubble parameter.

[@kc0itf]

Just what is "waving" in gravitational waves? Gravity is an acceleration... an acceleration doesn't "wave"!

[@valentinmalinov8424]

Looks like that you are able to see the conflicting postulates in the official narrative. - They claims that Space is "Empty" - (just a vacuum), but...Empty space cannot propagate waves. They also claim that the "Empty Space" is "Curving" So... what is curving there? They claiming that Spatial Curvature is forcing the traveling objects to circle each other? But... what is pushing two stationary objects toward each other? The "Empty Space" cannot insert force on the celestial objects. If you want to learn the answer to all these conflicting claims I will suggest the book - "Theory of Everything in Physics and the Universe" - It is easy to read book.