Extra dimensions, SN1987a, and nucleon–nucleon scattering data
نویسندگان
چکیده
منابع مشابه
Extra dimensions, SN1987a, and nucleon-nucleon scattering data
One of the strongest constraints on the existence of large, compact, “gravityonly” dimensions comes from SN1987a. If the rate of energy loss into these putative extra dimensions is too high, then the neutrino pulse from the supernova will differ from that actually seen. The dominant mechanism for the production of Kaluza-Klein gravitons and dilatons in the supernova is via gravistrahlung and di...
متن کاملWeakly Warped Extra Dimensions and SN1987A
The neutrino pulse from SN1987A provides one of the most rigourous constraints on models of extra dimensions. Previously, calculations have been done to bound the size of these extra dimensions in the case when the metric was factorizable. Here we consider the case of 2 ‘weakly warped’ extra dimensions. We find that even though weak warping seems only to affect the zero mode this can have a mea...
متن کاملEnhanced gravitational scattering from large extra dimensions
We show that enhanced gravitational scattering on small scales (< 0.1mm), which becomes possible in models with large extra dimensions, can establish statistical equilibrium between different particle species in the early Universe. Ultra-light WIMPs (e.g., axions) can be thermalized by such a mechanism and therefore are not viable CDM candidates in models with a fundamental Planck scale below a...
متن کاملHow a quark-gluon plasma phase modifies the bounds on extra dimensions from SN1987a
The shape of the neutrino pulse from the supernova SN1987a provides one of the most stringent constraints on the size of large, compact, “gravityonly” extra dimensions. Previously, calculations have been carried out for a newly-born proto-neutron star with a temperature of about 50 MeV at nuclear matter density. It is arguable that, due to the extreme conditions in the interior of the star, mat...
متن کاملLarge extra dimensions and deep-inelastic scattering at HERA
In scenarios motivated by string theories, it is possible to have extra Kaluza-Klein dimensions compactified to rather large magnitudes, leading to large effects of gravity at scales down to a TeV. The effect of the spin-2 Kaluza-Klein modes on the deepinelastic cross-section at HERA is investigated. We find that the data can be used to obtain bounds on the effective low energy scale, MS . prak...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2001
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(00)00667-2