Zobrazeno 1 - 10
of 201
pro vyhledávání: '"Obers, Niels A"'
We revisit the decoupling limits that lead to matrix theories on D-branes. We highlight the BPS nature of these limits, in which the target space geometry becomes non-Lorentzian and wrapped D-branes experience instantaneous gravitational forces. Appl
Externí odkaz:
http://arxiv.org/abs/2410.03591
We obtain a Palatini-type formulation for the Galilei and Carroll expansions of general relativity, where the connection is promoted to a variable. Known versions of these large and small speed of light expansions are derived from the Einstein-Hilber
Externí odkaz:
http://arxiv.org/abs/2312.13924
Publikováno v:
Phys. Rev. Lett. 132, 161603 (2024)
We study and extend the duality web unifying different decoupling limits of type II superstring theories and M-theory. We systematically build connections to different corners, such as Matrix theories, nonrelativistic string and M-theory, tensionless
Externí odkaz:
http://arxiv.org/abs/2311.10564
It is well known that one can take an infinite speed of light limit that gives rise to non-relativistic strings with a relativistic worldsheet sigma model but with a non-relativistic target space geometry. In this work we systematically explore two f
Externí odkaz:
http://arxiv.org/abs/2309.14467
Publikováno v:
SciPost Phys. 16, 088 (2024)
The interplay between quantum theory and general relativity remains one of the main challenges of modern physics. A renewed interest in the low-energy limit is driven by the prospect of new experiments that could probe this interface. Here we develop
Externí odkaz:
http://arxiv.org/abs/2308.07373
We study various aspects of the Carroll limit in which the speed of light is sent to zero. A large part of this paper is devoted to the quantization of Carroll field theories. We show that these exhibit infinite degeneracies in the spectrum and may s
Externí odkaz:
http://arxiv.org/abs/2307.06827
We review the history of Newton-Cartan gravity with an emphasis on recent developments, including the covariant, off-shell large speed of light expansion of general relativity. Depending on the matter content, this expansion either leads to Newton-Ca
Externí odkaz:
http://arxiv.org/abs/2212.11309
Publikováno v:
SciPost Phys. 13, 055 (2022)
We study the small speed of light expansion of general relativity, utilizing the modern perspective on non-Lorentzian geometry. This is an expansion around the ultra-local Carroll limit, in which light cones close up. To this end, we first rewrite th
Externí odkaz:
http://arxiv.org/abs/2112.12684
Carroll symmetry arises from Poincar\'e symmetry upon taking the limit of vanishing speed of light. We determine the constraints on the energy-momentum tensor implied by Carroll symmetry and show that for energy-momentum tensors of perfect fluid form
Externí odkaz:
http://arxiv.org/abs/2110.02319
We revisit the formulation of non-relativistic (NR) string theory and its target space geometry. We obtain a new formulation in which the geometry contains a two-form field that couples to the tension current and that transforms under string Galilei
Externí odkaz:
http://arxiv.org/abs/2107.00642