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  2. Arrow of time - Wikipedia

    en.wikipedia.org/wiki/Arrow_of_time

    In the 1928 book The Nature of the Physical World, which helped to popularize the concept, Eddington stated: . Let us draw an arrow arbitrarily. If as we follow the arrow we find more and more of the random element in the state of the world, then the arrow is pointing towards the future; if the random element decreases the arrow points towards the past.

  3. List of unsolved problems in physics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    The following is a list of notable unsolved problems grouped into broad areas of physics. [1]Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.

  4. Mark Buchanan - Wikipedia

    en.wikipedia.org/wiki/Mark_Buchanan

    He has been a guest columnist for the New York Times, and currently writes a monthly column for the journal Nature Physics. Buchanan's books and articles typically explore ideas of modern physics , especially in quantum theory or condensed matter physics , with an emphasis on efforts to use novel concepts from physics to understand patterns and ...

  5. Philosophy of physics - Wikipedia

    en.wikipedia.org/wiki/Philosophy_of_physics

    In philosophy, the philosophy of physics deals with conceptual and interpretational issues in physics, many of which overlap with research done by certain kinds of theoretical physicists. Historically, philosophers of physics have engaged with questions such as the nature of space, time, matter and the laws that govern their interactions, as ...

  6. Hard problem of consciousness - Wikipedia

    en.wikipedia.org/wiki/Hard_problem_of_consciousness

    Chalmers believes that the hard problem is irreducible to the easy problems: solving the easy problems will not lead to a solution to the hard problems. This is because the easy problems pertain to the causal structure of the world while the hard problem pertains to consciousness, and facts about consciousness include facts that go beyond mere ...

  7. Geometrical frustration - Wikipedia

    en.wikipedia.org/wiki/Geometrical_frustration

    In condensed matter physics, geometrical frustration (or in short, frustration) is a phenomenon where the combination of conflicting inter-atomic forces leads to complex structures. Frustration can imply a plenitude of distinct ground states at zero temperature , and usual thermal ordering may be suppressed at higher temperatures.

  8. Path of least resistance - Wikipedia

    en.wikipedia.org/wiki/Path_of_least_resistance

    Hikers choose the easy way to cross hills. The path of least resistance is the physical or metaphorical pathway that provides the least resistance to forward motion by a given object or entity, among a set of alternative paths. The concept is often used to describe why an object or entity takes a given path.

  9. Free will theorem - Wikipedia

    en.wikipedia.org/wiki/Free_will_theorem

    The free will theorem states: Given the axioms, if the choice about what measurement to take is not a function of the information accessible to the experimenters (free will assumption), then the results of the measurements cannot be determined by anything previous to the experiments. That is an "outcome open" theorem: