Proceedings of the 13th Patras Workshop on Axions, WIMPs and WISPs

Laboratory experiments along with astrophysical observations, as well as new developments in theory, are pushing to unravel new physics beyond the Standard Model. The intense search for the elusive particles of the dark sector continues. Axions and WIMPs remain the two leading candidates for dark matter. Also the dark energy remains among the biggest mysteries in all physics even though much effort and many ideas are put forward to decipher its nature. Worldwide efforts continue with new clever ideas coming-up in order to spot these or eventually other (un)predicted particles. The challenge is big as well as the physics motivation. No doubt, we are living through an exciting time and breakthroughs can happen any time soon. The last 5 years we had already two historic events: the discovery of the HIGGS particle at CERN and the observation of the gravitational waves by LIGO in USA. Both have shaken the field of astro-particle physics. After all, astro-particle physics is aiming to find out the workings of the Universe from its beginning until the present time. Various such hot topics and many more important aspects of particle and astroparticle physics were openly discussed between experimentalists and theorists at the 13th PatrasWorkshop on Axions, WIMPs, and WISPs. The event took place from May 15 - May 19, 2017 in Thessaloniki/Greece. As in the past, it was a very fruitful and lively meeting in an inspiring and cooperative atmosphere, which allowed for many open and constructive discussions, which initiated new collaboration work. Many participants have noticed the spirit of the PATRAS workshop and its atmosphere, which cannot be brought to paper, but many of its scientific highlights are collected in these proceedings. We are looking forward to the 14th PatrasWorkshop, which will be held in DESY, from June 18 - June 22, 2018.