{"product_id":"9782856298497","title":"The Mathematical Validity of the f(R) Theory of Modified Gravity","description":"\u003cp\u003eThis monograph solves the Cauchy problem for the $f(R)$ theory of modified gravity, which generalizes Einstein's theory. In the Einstein-Hilbert functional, the spacetime scalar curvature $R$ is replaced by a nonlinear function $f(R)$. The field equations are of order four in the derivatives of the metric. In this pioneering work, the authors provide a rigorous validation of this theory by analyzing the singular convergence of $f(R)$ toward $R$.\u003c\/p\u003e","brand":"SMF","offers":[{"title":"Default Title","offer_id":47044579229936,"sku":"9782856298497","price":69.75,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9782856298497_p0.jpg?v=1763708132","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9782856298497","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}