Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A proposed particle that would have been responsible for inflation in the very early universe
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Examples

The simplest models assume that the slope  also called the inflaton potential  resembles a very shallow parabola.

Inflation was triggered by a field in the early universe called the inflaton, whose energy density fell slowly, like a ball rolling down a gentle slope.

If the idea is correct, inflation was triggered by an energy field called the inflaton that drove the early universe to rapidly expand, stretching out and freezing what otherwise would have been random, shortlived quantum fluctuations.
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This paradigm relies upon a repulsive "inflaton" causing accelerated expansion.

As scientists once invoked epicycles to explain planetary motions, a repulsive "inflaton" was hypothesised to explain CMB uniformity.

In many of such theories, the scalar field equals the inflaton field, which is needed to explain the inflation of the universe after the Big Bang, as the dominating factor of the quintessence or Dark Energy.

The scalar field, or inflaton, cascaded down its field potential and induced this configuration.

These anisotropies are largely due to a quantum fluctuation, such as the scalar field of inflation inflaton, and we would not expect statistics which violated this, such as significant nonGaussian distributions.
SevenYear WMAP Results: No, They're NOT Anomalies  Universe Today

This preserves the basic idea of efold statistics on how inflaton fields "hop," but might prevent what I see as offensive boundary issues.
If We Live in a Multiverse, How Many Are There?  Universe Today

These occur because the inflaton field, a Higgslike field which induces inflationary cosmology, assumes different values in different regions of the earliest spatial surface of the spacetime universe.
If We Live in a Multiverse, How Many Are There?  Universe Today
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