As co-founder of String Field Theory, Dr. Kaku carries on Einstein's quest to unite the four fundamental forces of nature into a single grand unified theory of everything. (blog.feedspot.com)
BICEP2's value of r suggests that this was the same energy scale at which all the forces of nature except gravity (the electromagnetic, strong and weak forces) might have been unified into a single force — an idea called grand unified theory. (scientificamerican.com)
A new grand unified theory seems to unite electromagnetism and the weak and strong nuclear force without resorting to supersymmetry (newscientist.com)