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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. Theory of everything - Wikipedia

    en.wikipedia.org/wiki/Theory_of_everything

    A theory of everything (TOE), final theory, ultimate theory, unified field theory, or master theory is a hypothetical singular, all-encompassing, coherent theoretical framework of physics that fully explains and links together all aspects of the universe.

  5. 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 ...

  6. 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.

  7. Newton's rings - Wikipedia

    en.wikipedia.org/wiki/Newton's_rings

    Newton's Ring from Eric Weisstein's World of Physics; Explanation of and expression for Newton's rings Archived 2014-11-19 at the Wayback Machine; Newton-gyűrűk (Newton's rings) Video of a simple experiment with two lenses, and Newton's rings on mica observed. (On the website FizKapu.) (in Hungarian)

  8. Hierarchy problem - Wikipedia

    en.wikipedia.org/wiki/Hierarchy_problem

    In particle physics, the most important hierarchy problem is the question that asks why the weak force is 10 24 times as strong as gravity. [10] Both of these forces involve constants of nature, the Fermi constant for the weak force and the Newtonian constant of gravitation for gravity.

  9. Phenomenology (physics) - Wikipedia

    en.wikipedia.org/wiki/Phenomenology_(physics)

    In physics, phenomenology is the application of theoretical physics to experimental data by making quantitative predictions based upon known theories. It is related to the philosophical notion of the same name in that these predictions describe anticipated behaviors for the phenomena in reality.