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4 days ago · Demanding this `axion species scale' not to exceed the gravitational species scale, we obtain the bound (8\pi^2/g^2)f \lesssim M_ {\rm Pl} (8π2/g2)f ≲ M Pl. This is quite similar to the axion weak gravity conjecture bound, but can be applied to any gauge as well as the string interactions which are relevant to towers of states.
1 day ago · Vafa said that in-depth studies on quantum gravity laws and dark matter would significantly impact the future of physics, while Kapustin looked forward to the development of hydrogen atom physics ...
4 days ago · I talk with Cumrun Vafa, a respected physicist and originator of the swampland program, about how we might use constraints on what kinds of physics are compatible with string theory to make predictions about cosmology and other experimental regimes.
1 day ago · With Brian Greene, Alfred Shapere, and Cumrun Vafa, Yau introduced an ansatz for a Kähler metric on the set of regular points of certain surjective holomorphic maps, with Ricci curvature approximately zero.
3 days ago · Asymptotically massless towers of species are ubiquitous in the string landscape when infinite-distance limits are approached. Due to the remarkable properties of string dualities, they always comprise Kaluza-Klein states or higher-spin excitations of weakly coupled, asymptotically tensionless critical strings. The connection between towers of light species and small black holes warrants ...
2 days ago · An attempt to address this question, called string gas cosmology, was proposed by Robert Brandenberger and Cumrun Vafa. This model focuses on the dynamics of the early universe considered as a hot gas of strings.
1 day ago · Dear Colleagues and Students, I hope that you are enjoying the summer months! I write with exciting news. As the 2024 Paris Olympics approach, we are thrilled to cheer on one of our very own Physics students!
