On emergent gravity, ungravity and Λ

Physics Letters B

M. Sabido¹  Luis Rey Diaz-Barron² 

[1] Departamento de Física de la Universidad de Guanajuato, A.P. E-143, C.P. 37150, León, Guanajuato, Mexico;Instituto Politécnico Nacional, Unidad Profesional Interdisciplinaria de Ingeniería Campus Guanajuato, C.P. 36275, Silao de la Victoria, Mexico;

关键词: Cosmological constant;    Ungravity;    Entropic gravity;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this work we study the “ungravity” modifications to the Friedmann equations. The “ungravity” contributions are encoded in a modified entropy-area relation. To derive the modified Friedmann equations we use the first law of thermodynamics and the new entropy-area relationship. From the modified Friedmann equations (in the late time regime) we find an effective cosmological constant. Therefore, this simple model can provide an “ungravity” origin to the cosmological constant Λ.

【 授权许可】

Unknown