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Articles by David Wiltshire
Cosmological models are built on a simple, century-old idea -- but new observations demand a radical rethink
Our ideas about the Universe are based on a century-old simplification known as the cosmological principle. It suggests that when averaged on large scales, the Cosmos is homogeneous and matter is distributed evenly throughout. This allows a mathematical description of space-time that simplifies the application of Einstein’s general theory of relativity to the Universe as a whole. Our cosmological models are based on this assumption.
Cosmological models are built on a simple, century-old idea -- but new observations demand a radical rethink
Our ideas about the Universe are based on a century-old simplification known as the cosmological principle. It suggests that when averaged on large scales, the Cosmos is homogeneous and matter is distributed evenly throughout. This allows a mathematical description of space-time that simplifies the application of Einstein’s general theory of relativity to the Universe as a whole. Our cosmological models are based on this assumption.
Cosmological models are built on a simple, century-old idea -- but new observations demand a radical rethink
Our ideas about the Universe are based on a century-old simplification known as the cosmological principle. It suggests that when averaged on large scales, the Cosmos is homogeneous and matter is distributed evenly throughout. This allows a mathematical description of space-time[1] that simplifies the application of Einstein’s general theory of relativity to the Universe as a whole. Our cosmological models are based on this assumption.
The Case for Putting Aside Dark Energy to Re-Evaluate General Relativity
A renewed suggestion that dark energy may not be real – dispensing with 70% of the stuff in the universe – has reignited a longstanding debate. Dark energy and dark matter are theoretical inventions that explain observations we cannot otherwise understand. On the scale of galaxies, gravity appears to be stronger than we can account for using only particles that are able to emit light. So we add dark matter particles as 25% of the mass-energy of the Universe.
Can we ditch dark energy by better understanding general relativity?
A renewed suggestion that dark energy may not be real — dispensing with 70% of the stuff in the universe — has reignited a longstanding debate. Dark energy and dark matter are theoretical inventions that explain observations we cannot otherwise understand. On the scale of galaxies, gravity appears to be stronger than we can account for using only particles that are able to emit light. So we add dark matter particles as 25% of the mass-energy of the Universe.
Squids on the rise as oceans change
Unlike the declining populations of many fish species, the number of cephalopods (octopus, cuttlefish and squid) has increased in the world's oceans over the past 60 years, a University of Adelaide study has found. The international team, led by researchers from the University's Environment Institute, compiled a global database of cephalopod catch rates to investigate long-term trends in abundance, published in Cell Press journal Current Biology.
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