PIMCO Income A Fund as of 09/30/2017 Top ten holdings % of net assets 1. IRS USD 2.25000 12/20/17-5Y CME_Pay 12.01 2. CIRS USD 5.25Y MAT 2.28% 7/2017 MYC_Receive 8.97 3. IRS JPY 0.45000 03/20/19-10Y LCH_Pay 8.54 4. IRS USD 2.25000 12/20/17-5Y LCH_Pay 6.45 5. CIRS USD 5.33Y MAT 2.30% 8/2017 MYC_Receive 5.61 6. CIRS USD 5.33Y MAT 2.30% 8/2017 MYC_Receive 5.61 7. CIRS USD 5.25Y MAT 2.10% 9/2017 MYC_Receive 5.60 8. CIRS USD 5.25Y MAT 2.08% 9/2017 MYC_Receive 5.60 9. CIRS USD 5.25Y MAT 2.07% 9/2017 MYC_Receive 5.59 10. IRS USD 2.50000 12/20/17-10Y LCH_Pay 4.40
Gravity feels strongest where spacetime is most curved, and it vanishes where spacetime is flat. This is the core of Einstein's theory of general relativity, which is often summed up in words as follows: matter tells spacetime how to curve, and curved spacetime tells matter how to move.
What causes Gravity? One of Einstein's old tutors, a man by the name of Minkowski showed that the special theory of relativity could be expressed in an interesting way. The world we live in consists of four dimensions, the three space dimensions and one that is not exactly time but is related to time (it is in fact time multiplied by the square root of -1). This is not at all easy to understand but it means that space-time as we call it has some rather weird properties.