# Viability of the matter bounce scenario in Loop Quantum Cosmology from BICEP2 last data

## Abstract

The CMB map provided by the Planck project constrains the value of the ratio of tensor-to-scalar perturbations, namely r, to be smaller than 0.11 (95 % CL). This bound rules out the simplest models of inflation. However, recent data from BICEP2 is in strong tension with this constrain, as it finds a value r=0.20{sup +0.07}{sub -0.05} with 0r= disfavored at 7.0 σ, which allows these simplest inflationary models to survive. The remarkable fact is that, even though the BICEP2 experiment was conceived to search for evidence of inflation, its experimental data matches correctly theoretical results coming from the matter bounce scenario (the alternative model to the inflationary paradigm). More precisely, most bouncing cosmologies do not pass Planck's constrains due to the smallness of the value of the tensor/scalar ratio r≤ 0.11, but with new BICEP2 data some of them fit well with experimental data. This is the case with the matter bounce scenario in the teleparallel version of Loop Quantum Cosmology.

- Authors:

- Departament de Matemàtica Aplicada I, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona (Spain)

- Publication Date:

- OSTI Identifier:
- 22373404

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 97 MATHEMATICAL METHODS AND COMPUTING; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGICAL INFLATION; MAPS; MATTER; PERTURBATION THEORY; QUANTUM COSMOLOGY; SCALARS; TENSORS

### Citation Formats

```
De Haro, Jaume, and Amorós, Jaume, E-mail: jaime.haro@upc.edu, E-mail: jaume.amoros@upc.edu.
```*Viability of the matter bounce scenario in Loop Quantum Cosmology from BICEP2 last data*. United States: N. p., 2014.
Web. doi:10.1088/1475-7516/2014/08/025.

```
De Haro, Jaume, & Amorós, Jaume, E-mail: jaime.haro@upc.edu, E-mail: jaume.amoros@upc.edu.
```*Viability of the matter bounce scenario in Loop Quantum Cosmology from BICEP2 last data*. United States. doi:10.1088/1475-7516/2014/08/025.

```
De Haro, Jaume, and Amorós, Jaume, E-mail: jaime.haro@upc.edu, E-mail: jaume.amoros@upc.edu. Fri .
"Viability of the matter bounce scenario in Loop Quantum Cosmology from BICEP2 last data". United States.
doi:10.1088/1475-7516/2014/08/025.
```

```
@article{osti_22373404,
```

title = {Viability of the matter bounce scenario in Loop Quantum Cosmology from BICEP2 last data},

author = {De Haro, Jaume and Amorós, Jaume, E-mail: jaime.haro@upc.edu, E-mail: jaume.amoros@upc.edu},

abstractNote = {The CMB map provided by the Planck project constrains the value of the ratio of tensor-to-scalar perturbations, namely r, to be smaller than 0.11 (95 % CL). This bound rules out the simplest models of inflation. However, recent data from BICEP2 is in strong tension with this constrain, as it finds a value r=0.20{sup +0.07}{sub -0.05} with 0r= disfavored at 7.0 σ, which allows these simplest inflationary models to survive. The remarkable fact is that, even though the BICEP2 experiment was conceived to search for evidence of inflation, its experimental data matches correctly theoretical results coming from the matter bounce scenario (the alternative model to the inflationary paradigm). More precisely, most bouncing cosmologies do not pass Planck's constrains due to the smallness of the value of the tensor/scalar ratio r≤ 0.11, but with new BICEP2 data some of them fit well with experimental data. This is the case with the matter bounce scenario in the teleparallel version of Loop Quantum Cosmology.},

doi = {10.1088/1475-7516/2014/08/025},

journal = {Journal of Cosmology and Astroparticle Physics},

number = 08,

volume = 2014,

place = {United States},

year = {Fri Aug 01 00:00:00 EDT 2014},

month = {Fri Aug 01 00:00:00 EDT 2014}

}