Cosmologists Unveil New Group to Study Cosmic Topology

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Science Desk

In Short: Astronomy experts have formed COMPACT to explore the global shape and connectivity of the universe.

Cosmologists have been studying the cosmic microwave background (CMB) since the 1960s, but only in the early 2000s did they gain the sensitivity needed to detect patterns indicative of cosmic topology.

Jaffe, author of the upcoming book “The Random Universe,” noted that the modern era of cosmic topology research began in the late 1990s when scientists realized they could use CMB patterns to investigate topology.

In recent years, Jaffe and colleagues have established COMPACT, a group of about twenty international scientists dedicated to understanding cosmic topology.

According to Jaffe, the existence of certain paths in the universe suggests a specific type of topology, such as a torus, which would imply a closed loop universe.

If cosmic topology is confirmed, it could challenge the idea of endless space travel, as it might mean that voyagers could return to their starting point after traveling vast distances.

The Nature Astronomy authors explain that cosmic topology could imprint subtle signatures on the CMB and the three-dimensional distribution of matter, breaking homogeneity at the largest scales.

The CMB, the furthest back in cosmic time that is currently observable, holds clues to the universe's global shape and connectivity, potentially invalidating some long-held axioms of cosmology.

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The existence of paths like this indicates the kind of topology we are looking for, he says.
Because we know that the scale of the topology, if it is something like a torus, must be large enough that we can’t observe those twins, says Jaffe.
If some aspects of cosmic topology turn out to be true, the idea that starships might voyage the cosmos over hundreds of thousands of light years without ever returning to the same neck of space-time could be problematic.
But global topology may ultimately invalidate part, or all of that axiom.
The goal of astrophysicists like Jaffe is to identify the signatures of such topology via large-scale cosmological observations.

Sources

Universe Todaylink