Gregory Benford 
Cosm [EPUB ebook] 

After an accident in a brilliant young physicist’s most ambitious experiment, it appears: a wondrous sphere the size of a basketball, made of nothing known to science. Before long, it will be clear that this object has opened a vista on an entirely different universe, a newborn cosmos whose existence will rock this world and test one woman to the limit: the physicist who has ignited this thrilling adventure.