http://general-terms.thesaurus.ekt.gr/vocabhttp://general-terms.thesaurus.ekt.gr/vocab?tema=11333unified field theories http://general-terms.thesaurus.ekt.gr/vocab?tema=11333 elementary particle physics BT http://general-terms.thesaurus.ekt.gr/vocab?tema=11333 electromagnetism RT http://general-terms.thesaurus.ekt.gr/vocab?tema=11333 field theory (physics) RT http://general-terms.thesaurus.ekt.gr/vocab?tema=11333 superstrings NT http://general-terms.thesaurus.ekt.gr/vocab?tema=11333 grand unified theories NT http://general-terms.thesaurus.ekt.gr/vocab?tema=11333 supergravity NT