Thermodynamics of the early Universe with mirror dark matter

Ciarcelluti, Paolo; Lepidi, Angela

doi:10.1103/physrevd.78.123003

Cited by 20 publications

(17 citation statements)

References 22 publications

(28 reference statements)

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“…To keep our analysis simple, though, we have not considered this possibility. Note however, that the possible effects for early Universe cosmology of a nonzero T ′ /T initial condition, in the absence of kinetic mixing, have have been studied in the literature in [51,61,159,160,161]. See also the reviews [162,163].…”

Section: Evolution Of T ′ /T As a Function Of ǫmentioning

confidence: 99%

“…At earlier times, the expansion rate is greater so that the mirror-neutron/mirror-proton ratio freezes-out at a higher temperature, T ′ f reeze > T f reeze . For this reason, and also because there is insufficient time for mirror neutrons to decay, the mirror-neutron/mirror-proton ratio is expected to be much closer to unity [51,160].…”

Section: Mirror Bbn: the He ′ Abundancementioning

confidence: 99%

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Mirror dark matter: Cosmology, galaxy structure and direct detection

Foot

2014

Int. J. Mod. Phys. A

218

266

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A simple way to accommodate dark matter is to postulate the existence of a hidden sector. That is, a set of new particles and forces interacting with the known particles predominantly via gravity. In general this leads to a large set of unknown parameters, however if the hidden sector is an exact copy of the standard model sector, then an enhanced symmetry arises. This symmetry, which can be interpreted as space-time parity, connects each ordinary particle ($e, \ \nu, \ p, \ n, \ \gamma, ....)$ with a mirror partner ($e', \ \nu', \ p', \ n', \ \gamma', ...)$. If this symmetry is completely unbroken, then the mirror particles are degenerate with their ordinary particle counterparts, and would interact amongst themselves with exactly the same dynamics that govern ordinary particle interactions. The only new interaction postulated is photon - mirror photon kinetic mixing, whose strength $\epsilon$, is the sole new fundamental (Lagrangian) parameter relevant for astrophysics and cosmology. It turns out that such a theory, with suitably chosen initial conditions effective in the very early Universe, can provide an adequate description of dark matter phenomena provided that $\epsilon \sim 10^{-9}$. This review focuses on three main developments of this mirror dark matter theory during the last decade: Early universe cosmology, galaxy structure and the application to direct detection experiments.Comment: 130 page

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Section: Evolution Of T ′ /T As a Function Of ǫmentioning

confidence: 99%

Section: Mirror Bbn: the He ′ Abundancementioning

confidence: 99%

Mirror dark matter: Cosmology, galaxy structure and direct detection

Foot

2014

Int. J. Mod. Phys. A

218

266

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“…The BBN is studied for both kinds of matter, using an accurate treatment of the thermodynamics of the early Universe, based on the work done in Ref. [21], which considers the changes in the radiation temperatures due to the two e + -e − annihilations. The present analysis shows the results of accurate numerical simulations and updates all the previous works.…”

Section: Discussionmentioning

confidence: 99%

“…This effect and the thermodynamics of the early Universe were studied in details in Ref. [21]. Here we use the results of that work for the degrees of freedom and temperatures in the two particle sectors, in order to obtain a more detailed numerical description of the ordinary and mirror primordial nucleosynthesis processes, and more carefully predict the primordial abundances.…”

Section: Introductionmentioning

confidence: 99%

Big Bang Nucleosynthesis in Visible and Hidden-Mirror Sectors

Ciarcelluti¹

2014

Advances in High Energy Physics

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One of the still viable candidates for the dark matter is the so-called mirror matter. Its cosmological and astrophysical implications were widely studied in many aspects, pointing out the importance to go further with research and refine the studies. In particular, the Big Bang nucleosynthesis provides a strong test for every dark matter candidate, since it is well studied and involves relatively few free parameters. The necessity of accurate studies of primordial nucleosynthesis with mirror matter has then emerged. In order to fill this lack, I present here the results of accurate numerical simulations of the primordial production of both ordinary nuclides and nuclides made of mirror baryons, in presence of a hidden mirror sector with unbroken parity symmetry and with gravitational interactions only. These elements are the building blocks of all the structures forming in the Universe, therefore their chemical composition is a key ingredient for astrophysics with mirror dark matter. The production of ordinary nuclides show differences from the standard model for a ratio of the temperatures between mirror and ordinary sectors x = T ′ /T 0.3, and they present an interesting decrease of the abundance of 7 Li. For the mirror nuclides, instead, one observes an enhanced production of 4 He, that becomes the dominant element for x 0.5, and much larger abundances of heavier elements.

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“…It should be noted that mirror baryons are naturally dark, stable and massive. Currently, it seems that this type of matter could also explain in a natural way the coincidence between visible and dark matter densities in the universe (Ω B = 0.044 and Ω DM = 0.26) [22,23]. Interestingly, it could also provide an explanation of the controversial behaviour in galaxy cluster collisions [24].…”

Section: Introductionmentioning

confidence: 99%

Positronium portal into hidden sector: a new experiment to search for mirror dark matter

et al. 2010

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The understanding of the origin of dark matter has great importance for cosmology and particle physics. Several interesting extensions of the standard model dealing with solution of this problem motivate the concept of hidden sectors consisting of SU (3) C × SU (2) L × U (1) Y singlet fields. Among these models, the mirror matter model is certainly one of the most interesting. The model explains the origin of parity violation in weak interactions, it could also explain the baryon asymmetry of the Universe and provide a natural ground for the explanation of dark matter. The mirror matter could have a portal to our world through photon-mirror photon mixing (ε). This mixing would lead to orthopositronium (o − Ps) to mirror orthopositronium oscillations, the experimental signature of which is the apparently invisible decay of o − Ps. In this paper, we describe an experiment to search for the decay o − Ps → invisible in vacuum by using a pulsed slow positron beam and a massive 4π BGO crystal calorimeter. The developed high efficiency positron tagging system, the low calorimeter energy threshold and high hermiticity allow the expected sensitivity in mixing strength to be ε ≃ 10 −9 , which is more than one order of magnitude below the current Big Bang Nucleosynthesis limit and in a region of parameter space of great theoretical and phenomenological interest. The vacuum experiment with such sensitivity is particularly timely in light of the recent DAMA/LIBRA observations of the annual modulation signal consistent with a mirror type dark matter interpretation.

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Thermodynamics of the early Universe with mirror dark matter

Cited by 20 publications

References 22 publications

Mirror dark matter: Cosmology, galaxy structure and direct detection

Mirror dark matter: Cosmology, galaxy structure and direct detection

Big Bang Nucleosynthesis in Visible and Hidden-Mirror Sectors

Positronium portal into hidden sector: a new experiment to search for mirror dark matter

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