Cozy Dark: Science is awesome, and space is pretty! ...wanna be friends?

Brought to you the folks at I Dream of Space.


Dynamic, Dark Energy in an Accelerating Universe |

The models proposed by the UPV/EHU-University of the Basque Country researcher are contributing towards understanding the nature of dark energy.

It was cosmology that drew Irene Sendra from Valencia to the Basque Country. Cosmology also gave her the chance to collaborate with one of the winners of the 2011 Nobel Prize for Physics on one of the darkest areas of the universe. And dark matter and dark energy, well-known precisely because so little is known about them, are in fact the object of the study by Sendra, a researcher in the Department of Theoretical Physics and History of Science of the UPV/EHU’s Faculty of Science and Technology.

"Observations tell us that about 5% of the universe is made up of ordinary matter; 22% corresponds to dark matter, which we know exists because it interacts gravitationally with ordinary matter; another 73% is dark energy, which is known to be there because otherwise one would not be able to account for the accelerating expansion of the universe," explains Irene Sendra; "We are trying to find out a bit more about what dark energy is," she adds.

If dark energy did not exist, the gravitational pull exerted by matter would slow down the expansion of the universe, but observations have concluded that the opposite is the case.Dark energy is what makes the universe expand in an accelerating way, and contributing towards understanding its nature is the basis of the research Sendra has done as part of her PhD thesis entitled: "Cosmology in an accelerating universe: observations and phenomenology.”

The research starts with the hypothesis that dark energy could be dynamic.The most widely accepted model, known as the Lambda-CDM, explains the acceleration of the universe by means of the cosmological constant, whose equation of state would have a value of -1, constant throughout the whole evolution of the universe.However, there are observations which this model cannot account for.”We look for a dynamic, dark energy that would vary over time; we apply various models to the observable data, we play around with small disturbances, and we see whether they adapt better than a constant,” explains Sendra.

Making use of mathematical and statistical tools, the values that the observation proposes for the parameters studied are compared with those proposed by the model.”So,throughmany iterations, we can see which values would take the constants of our model.The equation of state of dark energy is worth practically -1 now, but it appears to have evolved from different values in the past; however, there is still a high percentage of error in determining these values.”According to Sendra’s calculations, these data are consistent with dynamic dark energy, which would vary with the redshift observed in the universe.Results that have yet to be published and obtained in collaboration with Adam Riess, the 2011 Nobel Prize Winner for Physics, go further in that direction. continue reading


  1. thegreatbigsomewhere reblogged this from sagansense
  2. twentyfirstcentury-schizoidgirl reblogged this from sagansense
  3. mar-er reblogged this from sagansense
  4. votredilettante reblogged this from sagansense
  5. teathings reblogged this from sagansense
  6. nerdandtall reblogged this from sagansense
  7. paradoxicalparadigms reblogged this from sagansense
  8. andropomorphine reblogged this from sagansense
  9. oh-biology reblogged this from sagansense
  10. laikas-owner reblogged this from sagansense
  11. libatywonder reblogged this from sagansense
  12. schmuckyblog reblogged this from sagansense
  13. nullpandaexception reblogged this from sagansense
  14. sagansense reblogged this from cozydark
  15. woaaaahitscris reblogged this from cozydark
  16. graceevolved reblogged this from cozydark
  17. thronethief reblogged this from cozydark
  18. achilles101 reblogged this from cozydark
Blog comments powered by Disqus

Loading posts...