Let $I$ be the set of points $(x,y)$ in the Cartesian plane such that $$x>\left(\frac{y^4}{9}+2015\right)^{1/4}$$ Let $f(r)$ denote the area of the intersection of $I$ and the disk $x^2+y^2\le r^2$ of radius $r>0$ centered at the origin $(0,0)$. Determine the minimum possible real number $L$ such that $f(r)<Lr^2$ for all $r>0$.
1. We start by analyzing the inequality given in the problem:
   \[
   x > \left(\frac{y^4}{9} + 2015\right)^{1/4}
   \]
   This inequality defines the set \( I \) in the Cartesian plane.

2. To understand the behavior of the inequality for large values of \( y \), we approximate:
   \[
   \left(\frac{y^4}{9} + 2015\right)^{1/4} \approx \left(\frac{y^4}{9}\right)^{1/4} = \frac{|y|}{\sqrt{3}}
   \]
   Therefore, for large \( y \), the inequality simplifies to:
   \[
   x > \frac{|y|}{\sqrt{3}}
   \]

3. Next, we consider the disk \( x^2 + y^2 \le r^2 \) of radius \( r \) centered at the origin. We need to find the area of the intersection of this disk with the region defined by \( x > \frac{|y|}{\sqrt{3}} \).

4. The region \( x > \frac{|y|}{\sqrt{3}} \) can be visualized as the area to the right of the lines \( y = \sqrt{3}x \) and \( y = -\sqrt{3}x \). These lines form an angle of \( 60^\circ \) with the x-axis.

5. The intersection of the disk \( x^2 + y^2 \le r^2 \) with the region \( x > \frac{|y|}{\sqrt{3}} \) is a sector of the disk. The angle of this sector is \( 60^\circ \) or \( \frac{\pi}{3} \) radians.

6. The area of a sector of a circle with radius \( r \) and angle \( \theta \) is given by:
   \[
   \text{Area of sector} = \frac{\theta}{2\pi} \cdot \pi r^2 = \frac{\theta r^2}{2}
   \]
   For \( \theta = \frac{\pi}{3} \), the area of the sector is:
   \[
   \text{Area of sector} = \frac{\frac{\pi}{3} r^2}{2} = \frac{\pi r^2}{6}
   \]

7. Since the region \( x > \frac{|y|}{\sqrt{3}} \) is symmetric about the x-axis, the total area of the intersection is twice the area of one sector:
   \[
   \text{Total area} = 2 \cdot \frac{\pi r^2}{6} = \frac{\pi r^2}{3}
   \]

8. We need to find the minimum possible real number \( L \) such that \( f(r) < Lr^2 \) for all \( r > 0 \). From the above calculation, we have:
   \[
   f(r) = \frac{\pi r^2}{3}
   \]
   Therefore, we need:
   \[
   \frac{\pi r^2}{3} < Lr^2
   \]
   Dividing both sides by \( r^2 \), we get:
   \[
   \frac{\pi}{3} < L
   \]

9. Hence, the minimum possible value of \( L \) is:
   \[
   L = \frac{\pi}{3}
   \]

The final answer is \(\boxed{\frac{\pi}{3}}\).