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Title

Big bang, cosmological constant, and quantum gravity: wonders of the century

AuthorsCalcagni, Gianluca
Issue Date28-Feb-2017
CitationOIST Seminar (2017)
AbstractThree questions have been haunting modern physics during the last decades. The first is whether singularities such as those inside black holes or the initial big bang that gave birth to the cosmos can be resolved. The second is about disclosing the real nature of the main and most mysterious component of the Universe, dubbed dark energy or cosmological constant. Neither the big bang nor the cosmological constant problem can be accommodated in general relativity or in ordinary models of particle interactions. A possibility is that they could be solved by unifying quantum physics with gravitation, but it is very difficult to formulate such a theory and to test it in experiments. Thus, the third question is about how to quantize gravity and to extract observable predictions. After an introduction on these topics accessible to a general audience, I will overview my contributions to the field in a nontechnical way, including on the microscopic structure of quantum spacetimes, on cosmological theories beyond Einstein gravity, and the recent proposal of multifractal spacetimes, where a number of ideas in quantum gravity can be easily developed and explored by observations in colliders, of the cosmic microwave background, and of gravitational waves. Some of these approaches use, or are inspired by, multidisciplinary tools of fractal geometry, anomalous transport, complex systems, and condensed matter physics. We conclude with a perspective on future trends and research plans.
DescriptionSeminario invitado. -- Presentación con 77 diapositivias. -- Okinawa Institute of Science and Technology, Okinawa, Japan, Tuesday, February 28, 2017. -- https://groups.oist.jp/fao/event/seminar-big-bang-cosmological-constant-and-quantum-gravity-wonders-century-dr-gianluca
URIhttp://hdl.handle.net/10261/165300
Appears in Collections:(CFMAC-IEM) Comunicaciones congresos
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