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In his Special Theory of Relativity, Einstein formulated the hypothesis according to which the speed of light is always the same, no matter what the conditions are. It may, however, be possible that – according to theoretical models of quantum gravitation – this uniformity of space-time does not apply to particles. Physicists have now tested this hypothesis with a first long-term comparison of two optical ytterbium clocks at the Physikalisch-Technische Bundesanstalt (PTB). With these clocks, whose error amounts to only one second in ten billion years, it should be possible to measure even extremely small deviations of the movement of the electrons in ytterbium. But the scientists did not detect any change when the clocks were oriented differently in space. Due to this result, the current limit for testing the space-time symmetry by means of experiments has been drastically improved by a factor of 100. In addition to this, the extremely...

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What can we expect from the revision of the International System of Units (SI), which was approved on 16 November 2018 and will enter into force on 20 May 2019? The answer depends on who you ask – an ordinary citizen, a student, a scientist or a metrologist in industry. The editorial staff of maßstäbe has asked this question – and gathered the answers in a new issue that is just as colorful and diverse as the answers obtained (Issue 14, “Maße für alle”, only in German). You can order this issue individually or as a classroom set free of charge; alternatively, you can subscribe to maßstäbe.

phone: +49 531 592-9313,
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Are you searching for a specific topic? Have you looked at our Opens internal link in current windowHomepage yet? There you will find the latest press releases and research news from PTB's specialist divisions. Maybe you'll find the subject you're looking for there. Perhaps looking at the Opens internal link in current windowPresseresonanz der PTB oder unsere Opens internal link in current windowZeitschriften und Opens internal link in current windowBroschüren interessant. Sie können sich aber natürlich auch direkt an uns wenden. Pressesprecher Jens Simon (0531-592-3005,Opens window for sending email jens.simon(at)ptb.de) oder die Nachrichtenredakteurinnen Erika Schow (0531-592-9314, Opens window for sending emailerika.schow(at)ptb.de) und Imke Frischmuth (0531-592-9323, Opens window for sending emailimke.frischmuth(at)ptb.de) weisen Ihnen gerne einen individuellen Weg durch den „Themen-Dschungel“ PTB. 

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Would you like to carry out research or make a film at PTB? Then you can contact the Press and Information Office with full confidence  (Karin Conring, (0531) 592-3006, presse(at)ptb.de). We will organize an appointment for you or arrange for you to spend a whole day with the right person at PTB.

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Do you need a good photo for your article? Under Press photos you can find images of important PTB topics which you can download free of charge. Can't see the right photo? Then please contact Erika Schow (+49(0)531 592-9314, erika.schow(at)ptb.de)