# Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions By Lisa Randall

Our world apparently consists of than the three spatial dimensions and the fourth dimension of time we are aware of according to Randall. She presents here an interesting discussion of those dimensions we can't see, and there could be an additional seven for a total of eleven.She begins her introduction to the subject with a discussion of objects such as a hypersphere and hypercube objects of the fourth dimension. We learn about gravity and curled up dimensions, braneworlds, and something called the bulk in which these branes exist. We learn what dimensions are and how they can escape our notice. There are two main approaches to learning about these phenomena: one is model building (a bottom up approach), and the other is string theory (a top down approach). Randall emphasizes the model building approach in this text, but she thinks that it's most likely that we will make advances by combining the best of both approaches.We are introduced to special and general relativity, time dilation, acceleration, equivalence principle, types of mass, non Euclidean geometry and curved spacetime, blackbodies, photoelectric effect, Compton scattering, Schrodinger's wave equation, Planck and weak scale energies, fermions, bosons, the weak force, and quantum field theory. Oh but wait, there's . We need to be informed about the nature of the standard model and something important called symmetry breaking and the Higgs mechanism. Randall thus completes our introduction to the fundamentals of quantum mechanics information we need to be aware of to understand what follows.As we move beyond the Standard Model, Randall delves into supersymmetry and how this is important to our understanding of the universe in which we live. It helps explain things such as the hierarchy problem (explained in the text), but it has some problems such as something called the flavor problem. We then segue into the world of string theory. This may be the theory that explains it all, but again, there are some problems, which are thoroughly discussed in the book. We get into a facet of string theory dealing with branes as well.We now get into what Randall has been leading up to. There is discussion of the various braneworld theories of how the universe might be constructed. We have the Horava Witten theory with eleven dimensions and two parallel branes, the sequestering of particles on different branes, large extra dimensions and the ADD model, and finally, we learn about warped spacetime as it relates to branes and the bulk dimension between them. The warped spacetime between the branes in this last theory can explain the hierarchy problem and why gravity is so weak in our world. Importantly, the veracity of these theories can be tested in the Large Hadron Collider experiments. Only time will tell which theory will prove to be the real deal if any.I've read numerous books on this topic of physics before, but I must say that Randall has done a remarkable job of explaining the various concepts. Randall sums it up quite nicely: Even if we have yet to understand the ultimate origin of matter at the deepest level, I hope I've convinced you that we do understand many aspects of its fundamental nature on the distance scales we have experimentally studied. [] Secrets of the cosmos will begin to unravel. I for one, can't wait. Me neither. Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions Detailed discussion on cosmology, in depth knowledge of the author and critical problems of cosmology are lucidly described. Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions Nesse livro, Lisa Randall traça desde o início algumas das principais teorias e modelos da física, como relatividade geral, mecânica quântica, física de partículas e teoria das cordas, buscando explicar alguns dos principais mistérios da física atual, como o motivo porquê a gravidade é tão fraca quando comparada às outras forças da natureza. A linguagem é acessível mesmo a leigos, usando de exemplos para tornar a leitura mais fácil. Um livro recomendado para quem deseja ter um contato inicial com a física moderna e alguns dos seus conceitos atuais. Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions Ecrit pas une physicienne mondialement connue, le livre présente des thèmes très raffinés de physique théorique rendus parfaitement accessibles au grand public pourvu que le lecteur soit intéressé par la science. Le livre est très intéressant et sa lecture est très agréable. Si l'existence de dimensions d'espace au delà des quatres dimensions connues dans la théorie de la relativité générale est prouvée (à l'aide des expérimentations en cours au LHC au CERN), alors notre vision du monde du 21ième siècle risque de changer profondément de la même manière qu'elle l'a été il y a un siècle avec la théorie de la relativité générale. Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions

The universe has many secrets. It may hide additional dimensions of space other than the familier three we recognize. There might even be another universe adjacent to ours, invisible and unattainable . for now. Warped Passages is a brilliantly readable and altogether exhilarating journey that tracks the arc of discovery from early twentieth century physics to the razor's edge of modern scientific theory. One of the world's leading theoretical physicists, Lisa Randall provides astonishing scientific possibilities that, until recently, were restricted to the realm of science fiction. Unraveling the twisted threads of the most current debates on relativity, quantum mechanics, and gravity, she explores some of the most fundamental questions posed by Nature—taking us into the warped, hidden dimensions underpinning the universe we live in, demystifying the science of the myriad worlds that may exist just beyond our own. Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions

I found this book both fascinating and challenging. I recommand it to anyone who is willing to take the time to understand the subject it goes further into the details than some previous books I'd read (mostly from Stephen Hawking). As such, it required concentration Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions It is a book not for the avrage reader. You have to be determined and minded but there a lot of information about he news physics theory and there is a real effort for the author to explain it not mathematical term the complexity of the universe. A reference and a vision in Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions Expands you mind.a complex subject written for the average person. Makes you think about the world around you in a new way. Would recommend to anyone interested in the mysteries of our world. Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions Lisa's definitely good at finding common or garden ways of presenting mathematically difficult concepts, although being a mathematician I may not be best placed to judge this.Only downside is it's now quite old, so talks about things like the possibility of the Higgs boson, which is now known to be a reality. Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions Lisa Randall unravels the mysteries of string theory. To make sense out of string theory, the understanding of how this theory behave's at a strong coupling, which is by now well established, first came as quite a surprise. One possibility, stated Randall, is that the extra Warped Passages: Unraveling the Mysteries of the Universe's Hidden Dimensions