Either Carlos Dolz has overhauled Einstein's theory of relativity or it's time for him to fix his clocks.After a six-hour experiment Wednesday at the Miami Museum of Science, Dolz -- who describes himself as a ''lecturing physicist'' but lacks the degree -- claimed his findings would require physicists to rewrite their textbooks.Two Casio watches he strapped to a gyrating disk for that length of time appeared to have deviated from the U.S. government's official time -- with one watch running about three seconds fast, the other two seconds slow.Dolz claimed the effect of acceleration on the time pieces caused them to run both fast and slow, compared to the official clock.''Time is only a frequency measured at some reference point,'' Dolz pronounced. ``Time is not some mysterious force.''Barry University physics Professor John Goehl, on hand as Dolz checked his results, said he suspected a mechanical problem with the watches.''This is not according to theory,'' Goehl said. ``According to theory, these watches would be fast by nanoseconds. No way you could have one go slow and the other go fast.''A notary was on hand to document Dolz's findings, which he said he had replicated on at least four other occasions.After the professor left, Dolz voiced disappointment at his naysayer. ''I invited him because I thought he would see this in a more positive way,'' he said.Dolz declined to say what the extent of his formal training was, except that he did not have a degree in physics. He said he works as a ''professor at large,'' but is not affiliated with a local university.He said he previously worked at the Coral Castle, a tourist attraction north of Homestead.Margaret Pulles Machado, a spokeswoman for the science museum, said the institution had some misgivings about Dolz after he failed to submit his résumé but decided to let him carry out his experiment anyway.