[1] San Diego State Univ SDSU, Dept Phys, San Diego, CA 92182 USA
[2] Univ Calif San Diego UCSD, Dept Phys, La Jolla, CA 92182 USA
[3] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City, Mexico
[4] JW von Goethe Univ, Frankfurt Inst Adv Studies FIAS, Frankfurt, Germany
[5] Observ Cote Azur, Blvd Observ, Nice, France
[6] Univ Fed Rio Grande do Sul UFRGS, Inst Fis, Porto Alegre, Brazil
[7] Univ Fed Pampa UNIPAMPA, Cacapava Do Sul, Brazil
[8] Int Ctr Relativist Astrophys Network ICRANet, Rome, Italy