Zobrazeno 1 - 10
of 211
pro vyhledávání: '"Tatar, Radu"'
Autor:
Gao, Yizhuo, Tatar, Radu
We study (0,2) two-dimensional theories in type IIB configurations with D5 branes wrapping blow-up ${\bf{P}}^1$ cycles of deformed resolutions for $A_n$ singularities or in T-dual IIA configurations with suspended D4 branes. We consider deformations
Externí odkaz:
http://arxiv.org/abs/2404.05079
Autor:
Chakravarty, Joydeep, Dasgupta, Keshav, Jain, Diksha, Jatkar, Dileep P., Maji, Archana, Tatar, Radu
The Taub-NUT geometry corresponds to the Kaluza-Klein monopole solution of M-theory and on dimension reduction along the Taub-NUT circle direction it becomes the D6 brane of type IIA string theory. We show that the Taub-NUT geometry can be realised a
Externí odkaz:
http://arxiv.org/abs/2308.08613
Recent no-go theorems have ruled out four-dimensional classical de Sitter vacua in heterotic string theory. On the other hand, the absence of a well-defined Wilsonian effective action and other related phenomena also appear to rule out such time-depe
Externí odkaz:
http://arxiv.org/abs/2303.12843
Autor:
Brahma, Suddhasattwa, Dasgupta, Keshav, Faruk, Mir-Mehedi, Kulinich, Bohdan, Meruliya, Viraj, Pym, Brent, Tatar, Radu
Publikováno v:
Fortsch. Phys, 2023, 2300136
We show that an explicit construction of a four-dimensional de Sitter space may be performed using a diagrammatic approach via nodal diagrams emanating from the path integral representation of the Glauber-Sudarshan state. Sum of these diagrams typica
Externí odkaz:
http://arxiv.org/abs/2211.09181
Publikováno v:
Fortschr. Phys. 2021, 2100131
We provide further evidence to support the fact that a four-dimensional effective field theory description with de Sitter isometries in IIB string theory, overcoming the no-go and the swampland criteria, can only exist if de Sitter space is realized
Externí odkaz:
http://arxiv.org/abs/2108.08365
Publikováno v:
Phys. Rev. Lett. 127, 181301 (2021)
We analyze four-dimensional Friedmann-Lemaitre-Robertson-Walker cosmologies in type IIB, arising from a M-theory dual, and find that the null energy condition (NEC) has to be obeyed by them (except for the negatively curved case) in order for the M-t
Externí odkaz:
http://arxiv.org/abs/2107.06900
Publikováno v:
J. High Energ. Phys. 2021, 243 (2021)
We use the superspace formulation of supergravity in eleven and ten dimensions to compute fermion couplings on the M2-brane and on D$p$-branes. In this formulation fermionic couplings arise naturally from the $\theta$-expansion of the superfields fro
Externí odkaz:
http://arxiv.org/abs/2106.02090
Publikováno v:
Phys. Rev. D 104, 086016 (2021)
In recent times, a considerable effort has been dedicated to identify certain conditions -- the so-called swampland conjectures -- with an eye on identifying effective theories which have no consistent UV-completions in string theory. In this paper,
Externí odkaz:
http://arxiv.org/abs/2104.10186
We construct purely non-perturbative anti-de Sitter vacua in string theory which, on uplifting to a de Sitter (dS) one, have a decay time many orders of magnitude smaller than those of standard constructions, such as the KKLT and LVS scenarios. By vi
Externí odkaz:
http://arxiv.org/abs/2009.04504
Glauber-Sudarshan states, sometimes simply referred to as Glauber states, or alternatively as coherent and squeezed-coherent states, are interesting states in the configuration spaces of any quantum field theories, that closely resemble classical tra
Externí odkaz:
http://arxiv.org/abs/2007.11611