From the Editor's Desk

Inflation and dark matter are not like string theory

There are two things that never seem to fall out of fashion when it comes to theoretical physics: people proposing wild new ideas that attempt to make sense of the Universe, and people declaring that some of the best and most well-established theories must be wrong. Physics is generally a conservative science, where the broader community is slow to accept anything novel unless the evidence supporting it becomes so overwhelming that all of the alternatives become untenable. Many grand ideas have come along in recent years, including:

among many others. However, nearly all of these ideas remain in the speculative category, as the critical evidence supporting their existence is sorely lacking.

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