scholarly journals Effect of a magnetic field on Schwinger mechanism in de Sitter spacetime

2018 ◽  
Vol 97 (2) ◽  
Author(s):  
Ehsan Bavarsad ◽  
Sang Pyo Kim ◽  
Clément Stahl ◽  
She-Sheng Xue
Keyword(s):  
Magnetic Field ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Sitter Spacetime ◽  
Schwinger Mechanism

Magnetic field induced by vacuum polarization in de Sitter spacetime

1989 ◽  
Vol 39 (12) ◽  
pp. 3612-3618 ◽  
Author(s):  
Syôzi Kawati ◽  
Akira Kokado
Keyword(s):  
Magnetic Field ◽  
Vacuum Polarization ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Sitter Spacetime

scholarly journals Schwinger mechanism in electromagnetic field in de Sitter spacetime

2018 ◽  
Vol 168 ◽  
pp. 03002 ◽  
Author(s):  
Ehsan Bavarsad ◽  
Sang Pyo Kim ◽  
Clément Stahl ◽  
She-Sheng Xue
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Pair Production ◽  
Production Rate ◽  
De Sitter ◽  
Sitter Spacetime ◽  
Constant Electromagnetic Field ◽  
Electric And Magnetic Fields ◽  
Schwinger Mechanism

We investigate Schwinger scalar pair production in a constant electromagnetic field in de Sitter (dS) spacetime. We obtain the pair production rate, which agrees with the Hawking radiation in the limit of zero electric field in dS. The result describes how a cosmic magnetic field affects the pair production rate. In addition, using a numerical method we study the effect of the magnetic field on the induced current. We find that in the strong electromagnetic field the current has a linear response to the electric and magnetic fields, while in the infrared regime, is inversely proportional to the electric field and leads to infrared hyperconductivity.

scholarly journals Stability of stealth magnetic field in de Sitter spacetime

2018 ◽  
Vol 98 (10) ◽  
Author(s):  
Shinji Mukohyama
Keyword(s):  
Magnetic Field ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Sitter Spacetime

scholarly journals Scalar current of created pairs by Schwinger mechanism in de Sitter spacetime

2016 ◽  
Vol 94 (10) ◽  
Author(s):  
Ehsan Bavarsad ◽  
Clément Stahl ◽  
She-Sheng Xue
Keyword(s):  
De Sitter Spacetime ◽  
De Sitter ◽  
Sitter Spacetime ◽  
Schwinger Mechanism ◽  
Scalar Current

scholarly journals Stealth magnetic field in de Sitter spacetime

2016 ◽  
Vol 94 (12) ◽  
Author(s):  
Shinji Mukohyama
Keyword(s):  
Magnetic Field ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Sitter Spacetime

scholarly journals Strict deformations of quantum field theory in de Sitter spacetime

2021 ◽  
Vol 62 (6) ◽  
pp. 062302
Author(s):  
M. B. Fröb ◽  
A. Much
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
De Sitter Spacetime ◽  
Quantum Field ◽  
De Sitter ◽  
Sitter Spacetime

scholarly journals Unimodular vs nilpotent superfield approach to pure dS supergravity

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Sukruti Bansal ◽  
Silvia Nagy ◽  
Antonio Padilla ◽  
Ivonne Zavala
Keyword(s):  
String Theory ◽  
General Framework ◽  
Recent Progress ◽  
High Energy ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
New Approach ◽  
Sitter Spacetime ◽  
Novel Approach ◽  
De Sitter Vacua

Abstract Recent progress in understanding de Sitter spacetime in supergravity and string theory has led to the development of a four dimensional supergravity with spontaneously broken supersymmetry allowing for de Sitter vacua, also called de Sitter supergravity. One approach makes use of constrained (nilpotent) superfields, while an alternative one couples supergravity to a locally supersymmetric generalization of the Volkov-Akulov goldstino action. These two approaches have been shown to give rise to the same 4D action. A novel approach to de Sitter vacua in supergravity involves the generalisation of unimodular gravity to supergravity using a super-Stückelberg mechanism. In this paper, we make a connection between this new approach and the previous two which are in the context of nilpotent superfields and the goldstino brane. We show that upon appropriate field redefinitions, the 4D actions match up to the cubic order in the fields. This points at the possible existence of a more general framework to obtain de Sitter spacetimes from high-energy theories.

scholarly journals Wavefunctions in dS/CFT revisited: principal series and double-trace deformations

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Hiroshi Isono ◽  
Hoiki Madison Liu ◽  
Toshifumi Noumi
Keyword(s):  
Principal Series ◽  
Light Fields ◽  
Quadratic Term ◽  
De Sitter Spacetime ◽  
Cosmological Horizon ◽  
De Sitter ◽  
Complementary Series ◽  
Point Function ◽  
Sitter Spacetime ◽  
Simple Scaling

Abstract We study wavefunctions of heavy scalars on de Sitter spacetime and their implications to dS/CFT correspondence. In contrast to light fields in the complementary series, heavy fields in the principal series oscillate outside the cosmological horizon. As a consequence, the quadratic term in the wavefunction does not follow a simple scaling and so it is hard to identify it with a conformal two-point function. In this paper, we demonstrate that it should be interpreted as a two-point function on a cyclic RG flow which is obtained by double-trace deformations of the dual CFT. This is analogous to the situation in nonrelativistic AdS/CFT with a bulk scalar whose mass squared is below the Breitenlohner-Freedman (BF) bound. We also provide a new dS/CFT dictionary relating de Sitter two-point functions and conformal two-point functions in the would-be dual CFT.

scholarly journals Interacting quantum fields in various charts of anti–de Sitter spacetime

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
E. T. Akhmedov ◽  
A. A. Artemev ◽  
I. V. Kochergin
Keyword(s):  
De Sitter Spacetime ◽  
Quantum Fields ◽  
De Sitter ◽  
Sitter Spacetime
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