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Neron model: can number of components decrease after based change?

Yes, there is such a result for Neron models of abelian varieties with semiabelian (aka semistable) reduction: "the number of components of the special fiber cannot decrease after base change". This i …
Kestutis Cesnavicius's user avatar
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Do abelian varieties have Neron models over arbitrary valuation rings?

As a partial answer to your question, let me sketch a proof of the following result found in 2015 in collaboration with David Holmes. Proposition. For a valuation ring $V$, every abelian $V$-scheme $ …
Kestutis Cesnavicius's user avatar