**March**

*E. Witten* has brought some long ago developed mathematics (by *Roger Penrose*) on the arena of the string theory, the *twistors*. This has stimulated many authors for further work. There has been *Twistor Strings Workshop* in Oxford in January 2005. Among the speakers were both Penrose and Witten. My view is that Sir Roger does not mind computing graviton and gluon scattering using twistors, but he is worried of problems on even more fundamental level. He has a new book *The Road to Reality*, which has been criticized by *Frank Wilczek* and, more favorably, by *Peter Woit*.### January

*V. Braun, Y-H He, B. Ovrut and T. Pantev* make a step toward string phenomenology in *A Heterotic Standard Model*.**Year 2004**

*Andrei Linde* and coauthors have found the landscape's *beauty attratctive*. They state that "... some of the surprising properties of our world might arise not through pure chance or miraculous cancellations, but through a natural selection mechanism during dynamical evolution."

*P. Brax, C. van de Bruck and A.-C. Davis* have written a very readable (" ... get a feeling of the physics ... " ) *review* (cover page only on this site) of *Brane World Cosmology* (total 57 pages, 6 figures), and start your own "brane wars".

*A. Ashtekar and J. Lewandowski* have prepared a pedagogical status report titled *Background Independent Quantum Gravity: A Status Report* (125 pages, 5 figures).

*Elias Kiritsis* has written an interesting rewiew *D-branes in Standard Model building, Gravity and Cosmology* (132 pages, 7 figures).

A quick look at some late summer papers:

*C. Burgess,* Inflatable String Theory? This review consists of 15 well written pages.

*T. Banks, W. Fischler, L. Manelli,* Microscopic Quantum Mechanics of the p=rho Universe. This paper has to be read carefully, or be set aside for future measures.

More of strings, branes and tachyons:

A. Sen, Tachyon Dynamics in Open String Theory.

D. Klemm, Black Holes and Singularities in String Theory .

C. Kokorelis, Standard Model Building from Intersecting D-Branes .

H. Nilles, Five Golden Rules for Superstring Phenomenology .

After the above papers on theory and model building it's interesting to read *M. Dine* who writes that a large group of people have found "... at the very least, .. a very large *elephant* in the closet".

*T. Banks* is skeptical about the *Landscape.*

*R. Bousso* discusses the deeper questions of string *Cosmology and the S-matrix.*

Year 2003

See my web site.