Zobrazeno 1 - 10
of 176
pro vyhledávání: '"Panda, Sukanta"'
Autor:
Panda, Sukanta, Vidyarthi, Archit
We present a novel way to constrain the ghost field with respect to other physical fields present in a given theory such that the theory becomes quantizable. This is achieved by imposing positivity of the total kinetic energy of the system and perfor
Externí odkaz:
http://arxiv.org/abs/2410.17924
The effective action formalism introduced by Vilkovisky and later modified by DeWitt is completely covariant suitable for obtaining an effective action that is independent of the parametrization of the quantum fields. Among a few basic properties of
Externí odkaz:
http://arxiv.org/abs/2406.16105
Autor:
Patil, Trupti, Panda, Sukanta
This paper investigates the effects of spatial curvature in a model where dark matter and dark energy interact. The analysis employs a range of datasets, including CMB, BAO, Type Ia Supernova, $H(z)$ from cosmic chronometers, $H_0$ measurements from
Externí odkaz:
http://arxiv.org/abs/2405.20170
Investigating the thermal inflationary model, we introduce stochastic effects, incorporating a cutoff parameter $\sigma$ which distinguishes between quantum and classical modes. Testing the model against Planck 2018 data, we observe a preference for
Externí odkaz:
http://arxiv.org/abs/2402.18494
Publikováno v:
JCAP 06 (2024) 071
We study the Bianchi-I cosmological model motivated by signals of statistical isotropy violation seen in cosmic microwave background (CMB) observations and others. To that end, we consider various kinds of anisotropic matter that source anisotropy in
Externí odkaz:
http://arxiv.org/abs/2310.07661
Publikováno v:
JCAP05(2024)033
We do a detailed analysis of a well-theoretically motivated interacting dark energy scalar field model with a time-varying interaction term. Using current cosmological datasets from CMB, BAO, Type Ia Supernova, $H(z)$ measurements from cosmic chronom
Externí odkaz:
http://arxiv.org/abs/2307.03740
Early during the era of cosmic inflation, rotational invariance may have been broken, only later emerging as a feature of low-energy physics. This motivates ongoing searches for residual signatures of anisotropic space-time, for example in the power
Externí odkaz:
http://arxiv.org/abs/2307.02141
It is known that Vilkovisky-DeWitt's effective action is gauge invariant off-shell and independent of quantum field parametrization. In this work, we perform the calculation of the divergences in two-loop Vilkovisky-DeWitt's effective action for the
Externí odkaz:
http://arxiv.org/abs/2304.08425
Publikováno v:
JCAP07(2023)051
We propose an algebraic analysis using a 3+1 decomposition to identify conditions for a clever cancellation of the higher derivatives, which plagued the theory with Ostrogradsky ghosts, by exploiting some existing degeneracy in the Lagrangian. We obt
Externí odkaz:
http://arxiv.org/abs/2303.12464
Autor:
Ajith, Abhijith, Panda, Sukanta
Publikováno v:
Eur. Phys. J. C 83, 770 (2023)
We study an inflation model driven by a triplet of antisymmetric tensor fields, with minimal and nonminimal couplings to gravity. First, we show that the presence of a triplet of antisymmetric tensor fields can provide inherent background isotropy in
Externí odkaz:
http://arxiv.org/abs/2212.13508