Could a CPL parametrization be included into Brans-Dicke model?

In summary, the speaker has studied using CPL parametrization and Matter power spectra from CAMB and CLASS codes to constrain cosmological parameters. Now, they want to study the Brans-Dicke model and are considering using Hi-CLASS to generate specific Matter power spectra for this framework. They are wondering if they can still use the CPL parametrization in the Brans-Dicke model and if the two modified models can co-exist. They also request for the post to be transferred to the "Beyond the Standard Model Forum" for more suitable discussion.
  • #1
fab13
320
7
TL;DR Summary
After doing some forecasts with w_0,wa CDM, I would like to know if i can keep the same structure of the code but with generating Matter power spectra of Brans-Dicke
I have studied up to now about forecasts to constrain cosmological parameters in the context of CPL( Chevallier-Polarski-Linder ) parametrization with w_0, ,w_a parameters in equation of state for cosmic fluid.

For this, I have used Matter power spectra ("fake data") generated by CAMB and CLASS codes.

Now, I have to study the Brans-Dicke model : I think about generating Matter power spectra with CLASS (or rather Hi-CLASS) which has an option to generate specific Matter power spectra dedicated to Brans-Dicke framework.

I would like to know if I could keep the CPL parametrization in Brans-Dicke model, i.e generating Brans-Dicke Matter power spectra and include them into the forecast code in order to assess constraints on classical cosmological parameters and also on w_0,w_a parameters.
 
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  • #2
Hello, could this post be transfered to "

Beyond the Standard Model Forum " forum ? , I think this would be more suitable​

 
  • #3
Could anyone give me some clues or some elements of answer ? The 2 modified models could co-exist ?

Thanks
 

FAQ: Could a CPL parametrization be included into Brans-Dicke model?

What is the Brans-Dicke model?

The Brans-Dicke model is a theoretical framework in gravitational physics that extends General Relativity by incorporating a varying gravitational constant. It introduces a scalar field that couples to gravity, allowing the gravitational constant to change over time and space. This model was proposed by Carl Brans and Robert Dicke in 1961 as an alternative to Einstein's theory of General Relativity.

What is a CPL parametrization?

A CPL parametrization refers to the Chevallier-Polarski-Linder parametrization, which is a commonly used method in cosmology to describe the equation of state of dark energy. It characterizes the dark energy equation of state parameter, w, as a function of redshift, typically expressed as w(z) = w0 + wa * (1 - a), where w0 is the present value of the equation of state parameter, wa describes its evolution, and a is the scale factor.

Why would one want to include a CPL parametrization in the Brans-Dicke model?

Incorporating a CPL parametrization into the Brans-Dicke model allows for a more comprehensive exploration of cosmological scenarios where both the gravitational constant varies and dark energy evolves over time. This combined approach could provide better fits to observational data, such as supernovae, cosmic microwave background, and large-scale structure, and offer deeper insights into the nature of dark energy and gravity.

What are the challenges in including CPL parametrization into the Brans-Dicke model?

One of the primary challenges is the increased complexity of the equations governing the universe's evolution. The Brans-Dicke model already involves a scalar field influencing gravity, and adding the CPL parametrization introduces additional parameters and dependencies. This makes analytical solutions difficult and often requires sophisticated numerical methods to solve. Additionally, ensuring consistency with observational data and maintaining theoretical stability can be challenging.

Has any research been conducted on including CPL parametrization in the Brans-Dicke model?

Yes, there has been research exploring the inclusion of CPL parametrization in the Brans-Dicke model. Various studies have investigated how the evolving equation of state for dark energy, as described by the CPL parametrization, interacts with the scalar field in the Brans-Dicke theory. These studies aim to understand the implications for cosmic acceleration, structure formation, and consistency with observational data. Researchers continue to explore this combined framework to better understand the dynamics of the universe.

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