Hyperspace: A Scientific Odyssey Through Parallel Universes, Time Warps, and the Tenth Dimension (1994, ISBN 0-19-286189-1) is a book by Michio Kaku

Michio Kaku

is an American theoretical physicist, the Henry Semat Professor of Theoretical Physics in the City College of New York of City University of New York, the co-founder of string field theory, and a "communicator" and "popularizer" of science...

, a theoretical physicist from the City College of New York

City College of New York

The City College of the City University of New York is a senior college of the City University of New York , in New York City. It is also the oldest of the City University's twenty-three institutions of higher learning...

. It focuses on Kaku's studies of higher dimension

Dimension

In physics and mathematics, the dimension of a space or object is informally defined as the minimum number of coordinates needed to specify any point within it. Thus a line has a dimension of one because only one coordinate is needed to specify a point on it...

s referred to as hyperspace. The recurring theme of the book is that all four forces of the universe (the strong force, the weak force, electromagnetism

Electromagnetism

Electromagnetism is one of the four fundamental interactions in nature. The other three are the strong interaction, the weak interaction and gravitation...

 and gravity) become more coherent and their description simpler in higher dimensions.

Summary

Michio Kaku tries to explain higher dimensions, first analyzing the history of higher dimensions of space and the struggle to unite quantum mechanics

Quantum mechanics

Quantum mechanics, also known as quantum physics or quantum theory, is a branch of physics providing a mathematical description of much of the dual particle-like and wave-like behavior and interactions of energy and matter. It departs from classical mechanics primarily at the atomic and subatomic...

 and general relativity

General relativity

General relativity or the general theory of relativity is the geometric theory of gravitation published by Albert Einstein in 1916. It is the current description of gravitation in modern physics...

 in one theory. He then goes on to detail theories concerning the 2-D world, named "Flatland

Flatland

Flatland: A Romance of Many Dimensions is an 1884 satirical novella by the English schoolmaster Edwin Abbott Abbott. Writing pseudonymously as "A Square", Abbott used the fictional two-dimensional world of Flatland to offer pointed observations on the social hierarchy of Victorian culture...

". The end of the book discusses such topics as wormhole

Wormhole

In physics, a wormhole is a hypothetical topological feature of spacetime that would be, fundamentally, a "shortcut" through spacetime. For a simple visual explanation of a wormhole, consider spacetime visualized as a two-dimensional surface. If this surface is folded along a third dimension, it...

s, parallel universe

Multiverse

The multiverse is the hypothetical set of multiple possible universes that together comprise all of reality.Multiverse may also refer to:-In fiction:* Multiverse , the fictional multiverse used by DC Comics...

s and the fate of the universe.

Part I Entering the Fifth Dimension

• Worlds Beyond Space and Time
• Mathematicians and Mystics
• The Man Who "Saw" the Fourth Dimension
• The Secret of Light: Vibrations in the Fifth Dimension

Part II Unification in Ten Dimensions

• Quantum Heresy
• Einstein's Revenge
• Superstrings
• Signals from the Tenth Dimension
• Before Creation

Part III Wormholes: Gateways to Another Universe?

• Black Holes and Parallel Universes
• To Build a Time Machine
• Colliding Universes