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Stratosphere
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I read Somewhere that the universe is expanding due to dark energy but how can dark energy create space and time?
Stratosphere said:... create space and time?
Stratosphere said:I read Somewhere that the universe is expanding due to dark energy but how can dark energy create space and time?
Solistics said:Two months or so ago an article about dark energy came in Scientific America. It showed how dark matter may not be uniform, or in other words certain areas of the universe may have more dark matter than others. If this is the case than our galaxy may live in a "void". Making it seem that the universe is accelerating faster. Think about a 2D surface. IN that surface there are two objects, one is the milkyway the other is a supernova. These two objects is in one big circle (e.g. the universe) that expands uniformally. In this model, the older the universe gets the greater the time it takes for light to reach us (they calculate the time via the red shift affect). As the universe gets older and older gravity should dominate and start to slow the expansion down, meaning for every calculated distance the difference should get less. THis is not the case though.
With evidence of an accelerating universe due to dark matter people think the universe is accelerating uniformaly, but what if it wasn't? What if ceratain areas of the universe had more dark matter? Try thinking of that 2d model again. however this time place our galaxy in a bulge out of the circle. The bulge represents an accelerating space-time, more dark matter. While the rest of the universe accelerates normally our "bulge" accelerates faster. Making it seem that the supernova is further away.
raknath said:Do u have a link to this article
The evidence for the universal expansion comes from observations of distant galaxies that show they are moving away from us at accelerating speeds. This is known as the "redshift" phenomenon, where the light emitted from these galaxies appears to be shifted towards the red end of the spectrum. Additionally, the cosmic microwave background radiation, a remnant of the early universe, also supports the idea of an expanding universe.
The discovery of the accelerating expansion of the universe was made by studying distant supernovae, which are exploding stars. The observation of these supernovae showed that they were not only moving away from us, but also at an increasing rate. This was unexpected and led to the development of the theory of dark energy, which is thought to be the driving force behind the acceleration.
The cause of the universal expansion is still a subject of debate among scientists. Some theories suggest that it is due to the force of gravity, while others propose the existence of dark energy, a mysterious force that is thought to make up a large portion of the universe. Other theories, such as the inflationary model, propose that the expansion was caused by a rapid period of expansion in the early universe.
No, the expansion of the universe is not uniform. It is believed that the expansion is faster in regions with less matter and slower in regions with more matter. This is because matter exerts a gravitational pull that slows down the expansion. This non-uniform expansion is supported by observations of the cosmic microwave background radiation and the distribution of galaxies in the universe.
It is currently believed that the universe will continue to expand forever. However, the rate of expansion may change over time depending on the amount of dark energy and matter in the universe. Some theories suggest that the expansion may eventually slow down and reverse, resulting in a "big crunch" where the universe collapses in on itself. However, more research is needed to understand the long-term fate of the universe.