Brane inflation in background supergravity

Choudhury, Sayantan; Pal, Supratik

doi:10.1103/physrevd.85.043529

Cited by 46 publications

(30 citation statements)

References 82 publications

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“…• The prescribed ideas can be worked out to derive cosmological constraints for other modified gravity frameworks i.e. Randall Sundrum single braneworld (RSII) [64][65][66][67][68][69][70][71][72] 16 ,Einstein-Hilbert-Gauss-Bonnet (EHGB) gravity [75,[80][81][82], Dvali-Gabadadze-Porrati (DGP) braneworld [79] and Einstein-Gauss-Bonnet-Dilaton (EGBD) gravity [74,[76][77][78]83] etc.…”

Section: Resultsmentioning

confidence: 99%

Can dark matter be an artifact of extended theories of gravity?

2016

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In this article, we propose different background models of extended theories of gravity, which are minimally coupled to the SM fields, to explain the possibility of genesis of dark matter without affecting the SM particle sector. We modify the gravity sector by allowing quantum corrections motivated from (1) local f (R) gravity and (2) non-minimally coupled gravity with SM sector and dilaton field. Next we apply conformal transformation on the metric to transform the action back to the Einstein frame. We also show that an effective theory constructed from these extended theories of gravity and SM sector looks exactly the same. Using the relic constraint observed by Planck 2015, we constrain the scale of the effective field theory (Λ U V ) as well as the dark matter mass (M ). We consider two cases-(1) light dark matter (LDM) and (2) heavy dark matter (HDM), and deduce upper bounds on thermally averaged cross section of dark matter annihilating to SM particles. Further we show that our model naturally incorporates self interactions of dark matter. Using these self interactions, we derive the constraints on the parameters of the (1) local f (R) gravity and (2) non-minimally coupled gravity from dark matter self interaction. Finally, we propose some different UV complete models from a particle physics point of view, which can give rise to the same effective theory that we have deduced from extended theories of gravity.

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Section: Resultsmentioning

confidence: 99%

Can dark matter be an artifact of extended theories of gravity?

2016

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“…Here in the RSII membrane paradigm the extra dimension "y" is non-compact for which the covariant formalism is applicable. Also in our discussion we use the bulk and membrane parameters: 1) M 5 represents the 5D quantum gravity cut-off scale, 2) Λ 5 represents the 5D bulk cosmological constant, 3) 3 membrane has a positive membrane tension σ and it is localized at the position of orbifold point y = 0 [34,[37][38][39][40][41]. The exact connecting relationship between the bulk and membrane parameters, M 5 , Λ 5 and σ are explicitly mentioned in the later section of this article.…”

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confidence: 99%

“…• Bulk cosmological constant Λ 5 is the most important parameter of RSII set up [34,[37][38][39][40][41]. Only the upper bound of Λ 5 is fixed to validate the Effective Field Theory framework within the prescribed set up.…”

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confidence: 99%

Effective field theory of dark matter from membrane inflationary paradigm

Choudhury

Dasgupta

2016

Physics of the Dark Universe

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In this article, we have studied the cosmological and particle physics constraints on dark matter relic abundance from effective field theory of inflation from tensor-to-scalar ratio (r), in case of Randall-Sundrum single membrane (RSII) paradigm. Using semi-analytical approach we establish a direct connection between the dark matter relic abundance (Ω DM h 2 ) and primordial gravity waves (r), which establishes a precise connection between inflation and generation of dark matter within the framework of effective field theory in RSII membrane. Further assuming the UV completeness of the effective field theory perfectly holds good in the prescribed framework, we have explicitly shown that the membrane tension, σ ≤ O(10 −9 ) M 4 p , bulk mass scale M 5 ≤ O(0.04−0.05) M p , and cosmological constantΛ 5 ≥ −O(10 −15 ) M 5 p , in RSII membrane plays the most significant role to establish the connection between dark matter and inflation, using which we have studied the features of various mediator mass scale suppressed effective field theory "relevant operators" induced from the localized s, t and u channel interactions in RSII membrane. Taking a completely model independent approach, we have studied an exhaustive list of tree-level Feynman diagrams for dark matter annihilation within the prescribed setup and to check the consistency of the obtained results, further we apply the constraints as obtained from recently observed Planck 2015 data and Planck+BICEP2+Keck Array joint datasets. Using all of these derived results we have shown that to satisfy the bound on, Ω DM h 2 = 0.1199 ± 0.0027, as from Planck 2015 data, it is possible to put further stringent constraint on r within, 0.01 ≤ r ≤ 0.12, for thermally averaged annihilation cross-section of dark matter, σv ≈ O(10 −28 − 10 −27 )cm 3 /s, which are very useful to constrain various membrane inflationary models.

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“…Also by suppressing the effect of back-reaction after inflation, in this work, I derive various useful constraints on-reheating, leptogenesis and baryogenesis in a model independent way 4 . The prime objective of this paper is to establish a theoretical constraint for a generic class of large field (|∆φ| > M p 5 ) and small field (|∆φ| < M p ) model of inflation to explain the origin of primordial magnetic field in the framework of Randall-Sundrun braneworld gravity (RSII) [28][29][30][31][32][33][34][35][36][39][40][41][42] from various probes:…”

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Constraining brane inflationary magnetic field from cosmoparticle physics after Planck

Choudhury

2015

J. High Energ. Phys.

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In this article, I have studied the cosmological and particle physics constraints on a generic class of large field (|∆φ| > M p ) and small field (|∆φ| < M p ) models of brane inflationary magnetic field from: (1) tensor-to-scalar ratio (r), (2) reheating, (3) leptogenesis and (4) baryogenesis in case of Randall-Sundrum single braneworld gravity (RSII) framework. I also establish a direct connection between the magnetic field at the present epoch (B 0 ) and primordial gravity waves (r), which give a precise estimate of non-vanishing CP asymmetry ( CP ) in leptogenesis and baryon asymmetry (η B ) in baryogenesis scenario respectively. Further assuming the conformal invariance to be restored after inflation in the framework of RSII, I have explicitly shown that the requirement of the sub-dominant feature of large scale coherent magnetic field after inflation gives two fold non-trivial characteristic constraints-on equation of state parameter (w) and the corresponding energy scale during reheating (ρ 1/4 rh ) epoch. Hence giving the proposal for avoiding the contribution of back-reaction from the magnetic field I have established a bound on the generic reheating characteristic parameter (R rh ) and its rescaled version (R sc ), to achieve large scale magnetic field within the prescribed setup and further apply the CMB constraints as obtained from recently observed Planck 2015 data and Planck+BICEP2+Keck Array joint constraints. Using all these derived results I have shown that it is possible to put further stringent constraints on various classes of large and small field inflationary models to break the degeneracy between various cosmological parameters within the framework of RSII. Finally, I have studied the consequences from two specific models of brane inflation-monomial and hilltop, after applying the constraints obtained from inflation and primordial magnetic field.

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Brane inflation in background supergravity

Cited by 46 publications

References 82 publications

Can dark matter be an artifact of extended theories of gravity?

Can dark matter be an artifact of extended theories of gravity?

Effective field theory of dark matter from membrane inflationary paradigm

Constraining brane inflationary magnetic field from cosmoparticle physics after Planck

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