Recent content by sergenyalcin

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    Graduate Why is there no factor of 4 in the variation of Riemann squared action?

    You are absolutely right about the factor of 2! i am sorry for the typo. but i still do not understand why the factor is not 4, but 2?
  2. S

    Graduate Why is there no factor of 4 in the variation of Riemann squared action?

    do you have a link for these lecture notes?
  3. S

    Graduate Why is there no factor of 4 in the variation of Riemann squared action?

    I am considering the variation of \delta ( \sqrt{g} R_{abcd} R^{abcd} ) and I know the answer is - \frac12 \sqrt{g} g_{\mu\nu}R_{abcd} R^{abcd} +\sqrt{g} R_{( \mu}{}^{bcd} R_{\nu ) bcd} + \ldots what i do not understand is the coefficient of the last term. For example, when we...