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Effects of the Intergalactic Plasma on Supernova Dimming via Photon-Axion Oscillations
Csaba Csaki, Nemanja Kaloper, John Terning
We have recently proposed a mechanism of photon-axion oscillations as a way of rendering supernovae dimmer without cosmic acceleration. Subsequently, it has been argued that the in…
Dimming Supernovae without Cosmic Acceleration
Csaba Csaki, Nemanja Kaloper, John Terning
We present a simple model where photons propagating in extra-galactic magnetic fields can oscillate into very light axions. The oscillations may convert some of the photons departi…
Generating Small Numbers by Tunneling in Multi-Throat Compactifications
S. Dimopoulos, S. Kachru, N. Kaloper +2
A generic F-theory compactification containing many D3 branes develops multiple brane throats. The interaction of observers residing inside different throats involves tunneling sup…
String Theory and Quintessence
Simeon Hellerman, Nemanja Kaloper, Leonard Susskind
We discuss the obstacles for defining a set of observable quantities analogous to an S-matrix which are needed to formulate string theory in an accelerating universe. We show that…
Small Numbers from Tunneling Between Brane Throats
S. Dimopoulos, S. Kachru, N. Kaloper +2
Generic classes of string compactifications include ``brane throats'' emanating from the compact dimensions and separated by effective potential barriers raised by the background g…