We could study General Relativity, when we consider d spatial dimensions (instead of 3). Then the computations are much more involved and there are many open issues in perturbation theory. Of course, such an extended theory is not realized in Nature, because we don’t observe extended extra dimensions. But people are still trying to search for small curved extra dimensions. Here is the presentation (pictures are taken from web).

# One of my lectures, which I had during the Week of Doctoral Students in Prague (in 2011)

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### johnynew

I was studying theoretical physics at the Charles university. I am interested in cosmological perturbation theory and mathematical methods of quantum gravity. I am also working in neuroscience. You could find my articles, for example, in online journal European Physical Journal C or mathematical journal Topology and its applications. I participated - during my Ph.D. - in many conferences, for example, in Odessa, Odessa International Astronomical Gamow Conference-School 2013, and cosmological conference Modern cosmology, CMB and LSS in Benasque 2014, or Winter School of Geometry and Physics in Srní 2015. Other my activity is playing the piano. I regularly give concerts. My favourite authors are S.Rachmaninoff, A.Scriabin and F.Chopin. You could find more informations at www.classicalprague.cz. View all posts by johnynew

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