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<p>Dear all,<br>
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<p>in case you are interested, <br>
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<div>we have a visitor at Nordita you may be interested in as he works mostly on cosmology and dark matter and some more theoretical aspects of gravitation theories like unimodular gravity. He is Purnendu Karmakar currently a PhD student at the Department of
Physics in Padova working with Sabino Matarrese. He is sitting in Nordita east at ground floor in the room for programs' participants and will stay until 4th November in case you are interested to talk to him.</div>
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<div>He will also give a talk next Thursday (3rd November) at the TWG meeting (13:15 to 15) about mimetic dark matter. Please find below further information.<br>
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<div>Cheers,<br>
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<div>Martina and Jon<br>
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<div>-------------------------------------------------------<br>
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<div>Title: `Constructing and exploring alternative theories of gravity: the mimetic scenario and beyond'</div>
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<div>Speaker: Purnendu Karmakar, Department of Physics and Astronomy 'G. Galilei', University of Padova, Italy</div>
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<div>Abstract: Despite its many successes of Lambda Cold Dark Matter (LCDM), Lambda (dark energy) introduces the cosmological constant and fine-tuning problems, and cold dark matter has never been directly observed either on earth or in space. These indicative
of a crisis motivate us to introduce the novel class of modified gravity theory, called ``generalized mimetic gravity theory'', which can explain and `mimic' the complete evolution of the universe, including the effects of radiation, dark matter, and dark
energy. The generalized mimetic gravity models arise in full generality by a non-invertible disformal transformation of very general scalar-tensor theories of gravity (including, e.g., Horndeski models and beyond Horndeski), which are a generalization of the
so-called `mimetic' dark matter theory recently introduced by Chamsedinne and Mukhanov. The general mimetic scalar-tensor theory has the same number of derivatives in the equations of motion as the original scalar-tensor theory. Sound speed of mimetic - Horndeski
and beyond will also be discussed. So far, no evidence against the existing laws of physics has been found. I shall wind up the seminar with some applications and the future openings of mimetic theories of gravity.</div>
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<div>Source: arXiv:1512.09374 [gr-qc] and arXiv:1506.08575 [gr-qc]<br>
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