1,855 research outputs found

    Detecting quark matter in the early universe by gravitational waves

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    For large baryochemical potential, strongly interacting matter might undergo a first order phase transition at temperatures T ~ 100-200 MeV. Within standard cosmology, however, the chemical potential is assumed to be very small leading to a crossover. We discuss implications of a first order QCD transition at high chemical potential being consistent with current observations. In this contribution we concentrate on effects on the gravitational wave spectrum. There are other interesting cosmological signals as a modification of the power spectrum of dark matter, the production of stellar black holes, and the seeds for the extragalactic magnetic fields which we briefly address also.Comment: 10 pages, talk given at the symposium "Advances in Nuclear Physics in Our Time", Goa, India, Nov. 28 - Dec. 2, 201

    Third ERTS Symposium: Abstracts

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    Abstracts are provided for the 112 papers presented at the Earth Resources Program Symposium held at Washington, D.C., 10-14 December, 1973

    Martin v. Boise: Sleeping in Public (Case Summary)

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    BEITRAEGE ZUR DIDAKTISCHEN GRAMMATIK. Karl‐Richard Bausch (Ed.)

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    Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/90187/1/3586413.pd

    Cosmological implications of a Dark Matter self-interaction energy density

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    We investigate cosmological constraints on an energy density contribution of elastic dark matter self-interactions characterized by the mass of the exchange particle and coupling constant. Because of the expansion behaviour in a Robertson-Walker metric we investigate self-interacting dark matter that is warm in the case of thermal relics. The scaling behaviour of dark matter self-interaction energy density shows that it can be the dominant contribution (only) in the very early universe. Thus its impact on primordial nucleosynthesis is used to restrict the interaction strength, which we find to be at least as strong as the strong interaction. Furthermore we explore dark matter decoupling in a self-interaction dominated universe, which is done for the self-interacting warm dark matter as well as for collisionless cold dark matter in a two component scenario. We find that strong dark matter self-interactions do not contradict super-weak inelastic interactions between self-interacting dark matter and baryonic matter and that the natural scale of collisionless cold dark matter decoupling exceeds the weak scale and depends linearly on the particle mass. Finally structure formation analysis reveals a linear growing solution during self-interaction domination; however, only non-cosmological scales are enhanced.Comment: 14 pages, 14 figures; version published in Phys. Rev.

    Fell v. Fat Smitty’s and Idaho’s Dram Shop Act (Case Summary)

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    I would still plant my apple tree:On Earthbound, the program of the research group Art & Sustainability

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    The World Breathing Me:Introduction to Artizein Special on Art, Ecology and Education

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    This introductory article argues why it is both relevant and timely to reflect on ways in which art and ecology can be brought together in educational practices – the theme of this edition of Artizein. It also provides an overview of all written contributions
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