Einstein's bridge : a novel of hard science fiction

In 2004 in a possible universe, the DOE's Superconducting Supercollider has been constructed in Waxahachie, Texas and is beginning operation, making unintended trans-dimensional signals that are being received in other universes and are attracting the attention of powerful and intelligent aliens, benevolent and hostile. This is a novel about cutting-edge physics, alien contact, wormholes, time travel, the politics of large-scale physics, and the race to change history and prevent the destruction of humanity. A condensed-matter physics experiment in a university physics laboratory produces an unexpected breakthrough, when the apparatus begins swapping normal matter with "shadow matter". Industrial espionage goes awry and young physicist David Harrison and two small children find themselves inside a giant tree in an alternate Earth populated by strange, wonderful, and dangerous six-legged wildlife. David and the children must find a way back, while dealing with the local fauna and peeking and poking at the Earth they left to thwart the agents who caused their problems