make a better world. so make a better loG.digiNORI / You may say I'm a dreamer. Sharing all the world. / Happy Hacking.
Livin' for today
Imagine there's no heaven / It's easy if you try /No hell below us / Above us, only sky // Imagine all the people / Livin' for today / Ah // Imagine there's / no countries / It isn't hard to do / Nothing to kill or die for / And no religion, too // Imagine all the people / Livin' life in peace /You // You may say I'm a dreamer / But I'm not the only one / I hope someday you'll join us / And the world will be as one // Imagine no possessions / I wonder if you can / No need for greed or hunger / A brotherhood of man // Imagine all the people / Sharing all the world / You // You may say I'm a dreamer / But I'm not the only one / I hope someday you'll join us / And the world will live as one
The general relativistic cosmological Friedmann equations, which describe how the scale factor of the universe evolves, are expanded explicitly to include energy forms not usually seen. The evolution of the universe as predicted by the Friedmann equations when dominated by a single, isotropic, stable, static, perfect-fluid energy form is discussed for different values of the gravitational pressure to density ratio 𝑤. These energy forms include phantom energy (𝑤<−1), cosmological constant (𝑤=−1), domain walls (𝑤=−2∕3), cosmic strings (𝑤=−1∕3), normal matter (𝑤=0), radiation and relativistic matter (𝑤=1∕3), and a previously little-discussed form of energy called “ultralight” (𝑤>1∕3). A brief history and possible futures of Friedmann universes dominated by a single energy form are discussed. (https://bit.ly/Friedmannequations)