Spontaneously broken parity and consistent cosmology with transitory domain walls

Mishra, S.R.; Yajnik, Urjit A.

doi:10.1103/physrevd.81.045010

Cited by 22 publications

(36 citation statements)

References 53 publications

(98 reference statements)

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“…In presence of supersymmetry, the constraints on the D-parity breaking scale was discussed in [5]. Here we perform the same analysis in the absence of supersymmetry and also check if successful gauge coupling unification can be achieved simultaneously in these models.…”

Section: Introductionmentioning

confidence: 87%

“…This possibility was considered in [17,18]. As discussed in [5], the evolution of energy density of such walls can be expressed as…”

Section: Domain Wall Dynamicsmentioning

confidence: 99%

“…In view of this, we summarize the three cases of domain wall dynamics discussed in [5], one of which originates in radiation dominated (RD) Universe and destabilized also within the radiation dominated Universe. This scenario was originally proposed by Kibble [7] and Vilenkin [15].…”

Section: Domain Wall Dynamicsmentioning

confidence: 99%

“…Incorporating supersymmetry into such models have several other motivations like protecting the scalar sector from quadratic divergences, providing a natural dark matter candidate among others. However, as studied previously in [5,6], generic Supersymmetric Left-Right models are tightly constrained from consistent cosmology as well as successful gauge coupling unification point of view and in quite a few cases these models do not give rise to successful unification and consistent cosmology simultaneously. With a view of this, we intend to study non-supersymmetric versions of LRSM and check if both of these constraints can be satisfied simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…Earlier studies on gauge coupling unification in non-supersymmetric LRSM were done in [11,12] and very recently in [13]. Here adopt the procedure outlined in [12] for gauge coupling unification and that in [5] for domain wall disappearance mechanism to show that in the minimal versions of non-supersymmetric LRSM, successful gauge coupling unification and domain wall disappearance can not be achieved simultaneously. We then propose two possible extensions of such minimal models which can successfully give rise to both of these desired outcomes.…”

Section: Introductionmentioning

confidence: 99%

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Spontaneous parity breaking, gauge coupling unification, and consistent cosmology with transitory domain walls

Borah

2012

Phys. Rev. D

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Formation of transitory domain walls is quite generic in theories with spontaneous breaking of discrete symmetries. Since these walls are in conflict with cosmology, there has to be some mechanism which makes them disappear. We study one such mechanism by incorporating Planck scale suppressed operators within the framework of Left-Right Symmetric Models (LRSM) where Left-Right parity (D parity) is spontaneously broken. We find that this mechanism can not make the walls disappear in minimal versions of LRSM. We propose two viable extensions of this model and show that Planck scale suppressed operators can give rise to successful disappearance of domain walls provided the scale of parity breaking obeys certain limits. We also constrain the scale of parity breaking by demanding successful gauge coupling unification and make a comparison of the unification and cosmology bounds.

show abstract

Section: Introductionmentioning

confidence: 87%

“…This possibility was considered in [17,18]. As discussed in [5], the evolution of energy density of such walls can be expressed as…”

Section: Domain Wall Dynamicsmentioning

confidence: 99%

Section: Domain Wall Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spontaneous parity breaking, gauge coupling unification, and consistent cosmology with transitory domain walls

Borah

2012

Phys. Rev. D

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Gravitational wave signature of generic disappearance of Z2-symmetry breaking domain walls

Banerjee,

Yajnik

2024

J. High Energ. Phys.

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Breaking of discrete parity at high scale gives rise to Z2-domain walls (DW). The metastability of such walls can make them relatively long lived and contradict standard cosmology. We consider two classes of theories with similar underlying feature, the left right symmetric theories and two Higgs doublet models. Both of them possess some breaking of Z2 discrete symmetries. As a first step, domains form at a high energy scale during parity breaking. In the second step, these domains further decompose into subdomains due to Z2 symmetry breaking in two Higgs doublet models closer to the electroweak scale. We show that after this two step formation of domains and subdomains, a QCD instanton induced energy difference can remove the domain walls as well as the subdomain walls at around the same time successfully. The removal occurs purely as the result of a chance event taking place with probability very close to 0.25, and does not require one to introduce any non-renormalisable Z2-symmetry breaking term to the Lagrangian. We then investigate the gravitational waves arising from the collapse of such domain walls and show that the peak frequency of these waves lies in the 10−7–10−6 Hz band, corresponding to annihilation temperatures of 1–10 GeV. This frequency band is sensitive to pulsar timing array based experiments such as SKA and NANOGrav. The recent NANOGrav results rule out our DW collapse model for higher values of parity breaking scale above 107 GeV. Our DW collapse model with parity breaking scales below 107 GeV remains consistent with the current NANOGrav results and has a good chance of being seriously tested in future pulsar timing based experiments.

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Domain walls and CP violation with left right supersymmetry: implications for leptogenesis and electron EDM

Banerjee

Yajnik

2021

J. High Energ. Phys.

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Low scale leptogenesis scenarios are difficult to verify due to our inability to relate the parameters involved in the early universe processes with the low energy or collider observables. Here we show that one can in principle relate the parameters giving rise to the transient CP violating phase involved in leptogenesis with those that can be deduced from the observation of electric dipole moment (EDM) of the electron. We work out the details of this in the context of the left right symmetric supersymmetric model (LRSUSY) which provides a strong connection between such parameters. In particular, we show that baryon asymmetry requirements imply the scale MB−L of U(1)B−L symmetry breaking to be larger than 104.5 GeV. Moreover the scale MR of SU(2)R symmetry breaking is tightly constrained to lie in a narrow band significantly below $$ {M}_{B-L}^2/{M}_{EW} $$ M B − L 2 / M EW . These are the most stringent constraints on the parameter space of LRSUSY model being considered.

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Spontaneously broken parity and consistent cosmology with transitory domain walls

Cited by 22 publications

References 53 publications

Spontaneous parity breaking, gauge coupling unification, and consistent cosmology with transitory domain walls

Spontaneous parity breaking, gauge coupling unification, and consistent cosmology with transitory domain walls

Gravitational wave signature of generic disappearance of Z2-symmetry breaking domain walls

Domain walls and CP violation with left right supersymmetry: implications for leptogenesis and electron EDM

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