You are invited to submit an abstract for consideration as an oral or poster presentation. All abstracts will be reviewed by a panel of experts who will assess them for inclusion into the conference program.

The abstract is to be submitted in plain text using a web form. The maximum length for abstracts is 250 words. You will be required to select your preferred presentation type and one of the conference topics.

Early abstract submission: deadline March 14, 2016 (Monday).

Decision on selected proposals: Please contact the session chair or the conference email address if you have not received an email message on your submitted abstract.

Late abstract submission: deadline May 9, 2016 (Monday).

Decision on selected proposals: May 30, 2016 (Monday)

Abstract submission is closed.

To secure IUPAP sponsorship, the organizers have provided assurance that the GR21 Conference will be conducted in accordance with IUPAP principles as stated in the ICSU-Document "Universality of Science" (sixth edition, 1989) regarding the free circulation of scientists for international purposes. In particular, no bona fide scientist will be excluded from participation on the grounds of national origin, nationality, or political considerations unrelated to science.