Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Mehta, Viraf M."'
We study the landscape of axion theories in compactifications of type IIB string theory on orientifolds of Calabi-Yau threefolds. In a sample of approximately 400,000 geometries we find that in the regime of perturbative control there are only a hand
Externí odkaz:
http://arxiv.org/abs/2309.01831
Autor:
Mehta, Viraf M., Demirtas, Mehmet, Long, Cody, Marsh, David J. E., McAllister, Liam, Stott, Matthew J.
We perform an extensive analysis of the statistics of axion masses and interactions in compactifications of type IIB string theory, and we show that black hole superradiance excludes some regions of Calabi-Yau moduli space. Regardless of the cosmolog
Externí odkaz:
http://arxiv.org/abs/2103.06812
Autor:
Mehta, Viraf M., Demirtas, Mehmet, Long, Cody, Marsh, David J. E., McAllister, Liam, Stott, Matthew J.
We obtain constraints from black hole superradiance in an ensemble of compactifications of type IIB string theory. The constraints require knowing only the axion masses and self-interactions, and are insensitive to the cosmological model. We study mo
Externí odkaz:
http://arxiv.org/abs/2011.08693
Light pseudo-Nambu-Goldstone bosons (pNGBs) such as, e.g.~axion-like particles, that are non-thermally produced via the misalignment mechanism are promising dark matter candidates. An important feature of pNGBs is their periodic potential, whose scal
Externí odkaz:
http://arxiv.org/abs/1605.01367
Publikováno v:
Phys. Rev. D 93, 063522 (2016)
Recently Graham, Kaplan and Rajendran [1] proposed cosmological relaxation as a mechanism for generating a hierarchically small Higgs vacuum expectation value. Inspired by this we collect some thoughts on steps towards a solution to the electroweak h
Externí odkaz:
http://arxiv.org/abs/1508.03321
Autor:
Mehta, Viraf M.
We present a novel string-derived $U(1)$ combination that satisfies necessary properties to survive to low scales. We discuss previous attempts at acquiring such an abelian gauge symmetry from two different string embeddings and the pitfalls associat
Externí odkaz:
http://arxiv.org/abs/1503.04671
Autor:
Faraggi, Alon E., Mehta, Viraf M.
We explore the phenomenological viability of a light Z' in heterotic-string models, whose existence has been motivated by proton stability arguments. A class of quasi-realistic string models that produce such a viable Z' are the Left-Right Symmetric
Externí odkaz:
http://arxiv.org/abs/1304.4230
Autor:
Faraggi, Alon E., Mehta, Viraf M.
The CDF collaboration's recent observation of an excess of events in the Wjj channel may be attributed to a new Abelian vector boson with suppressed couplings to leptons. While D0 finds no evidence of an excess, the CDF data provide an opportunity to
Externí odkaz:
http://arxiv.org/abs/1106.5422
Autor:
Faraggi, Alon E., Mehta, Viraf M.
Proton stability is one of the most perplexing puzzles in particle physics. While the renormalizable Standard Model forbids proton decay mediating operators due to accidental global symmetries, many of its extensions introduce such dimension four, fi
Externí odkaz:
http://arxiv.org/abs/1106.3082