A funeral will be held this afternoon in Brooklyn, N.Y., for Arnold Rosenblum, 47, internationally known theoretical physicist and former Utah State University associate professor, who died of natural causes Tuesday, Jan. 1, 1991, at his home in Logan.

The service for Rosenblum, who had been director of the International Institute of Theoretical Physics at USU until this past June, will be held at I.J. Morris Funeral Home, with burial in Beth David Cemetery, Elmont, N.Y.A memorial service will be held Jan. 14 or 15 at Utah State University, with the time and place to be announced, according to Gordon Lind, of Smithfield, a close friend and a USU physics professor.

Rosenblum was born June 24, 1943, in Brooklyn, N.Y. He received a bachelor of science degree in physics from Columbia University in 1964, a master of science degree from the University of Pennsylvania in 1965 and a doctorate from Temple University in 1970.

His honors include the Harvard Smithsonian Award in 1981 and the Humbolt Award in 1983 for excellence in research. He was affiliated with the Max Planck Institute in Munich, Germany, and the North Atlantic Treaty Organization.