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It may sound stupid but something bothers me and I want to ask
This question come to my mind due to another thread,
https://www.physicsforums.com/threa...is-my-logic-faulty.935533/page-2#post-5910474
In Friedmann Equation we are assuming that universe is homogeneous and isotropic in large scales.
I think its possible to assume that the universe may not be homogeneous larger then the observable universe scale, since we cannot observe it.
"Moreover, theory suggests that this may not be the end of the story. According to inflationary theory, the universe continues to be homogeneous and isotropic over distances larger than 3000 Mpc, but it becomes highly inhomogeneous when viewed on scales much much larger than the observable patch."
Mukhanov, V. (2005). Physical foundations of cosmology (p. 3).
Lets assume universe is not homogeneous and isotropic , in that case, Is it possible that observable universe can get heat from surroundings, (you can think as its like a multiverse theory ), so that the tempature is also spreading homogenous and we don't see it at CMB.
Or , that the universe may lose heat ?
It's a hypothetical question but I am just asking is it possible or not.
Thanks
This question come to my mind due to another thread,
https://www.physicsforums.com/threa...is-my-logic-faulty.935533/page-2#post-5910474
In Friedmann Equation we are assuming that universe is homogeneous and isotropic in large scales.
I think its possible to assume that the universe may not be homogeneous larger then the observable universe scale, since we cannot observe it.
"Moreover, theory suggests that this may not be the end of the story. According to inflationary theory, the universe continues to be homogeneous and isotropic over distances larger than 3000 Mpc, but it becomes highly inhomogeneous when viewed on scales much much larger than the observable patch."
Mukhanov, V. (2005). Physical foundations of cosmology (p. 3).
Lets assume universe is not homogeneous and isotropic , in that case, Is it possible that observable universe can get heat from surroundings, (you can think as its like a multiverse theory ), so that the tempature is also spreading homogenous and we don't see it at CMB.
Or , that the universe may lose heat ?
It's a hypothetical question but I am just asking is it possible or not.
Thanks
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