32 citations · 105 across the 16 of their papers we have counts for
12 papers · 1 filter
Quantizability of Lorentz-violating field theories with singular Hamiltonians
Sandeep Aashish, Md Saif
Spontaneous Lorentz-violating models of an antisymmetric tensor field are known to possess a singular Hamiltonian on the vacuum manifold, leading to unresolvable pathologies that r…
Inflation with antisymmetric tensor field: new candidates
Sandeep Aashish, Abhijith Ajith, Sukanta Panda +1
We study classes of inflation models driven by antisymmetric tensor field, with minimal and nonminimal couplings to gravity, that address known issues of such models considered in…
Note on stability and microcausality in Lorentz violating antisymmetric tensor field
Sandeep Aashish
The fundamental issues of microcausality and energy positivity conditions are important to be investigated in the context of spontaneous Lorentz violating theories. We check the mi…
Covariant Quantum Gravitational Corrections to Scalar and Tensor Field Models
Sandeep Aashish
Recent and upcoming experimental data as well as the possibility of rich phenomenology have spiked interest in studying the quantum effects in cosmology at low (inflation-era) ener…
Gravitational waves from inflation with antisymmetric tensor field
Sandeep Aashish, Abhilash Padhy, Sukanta Panda
We build upon the past studies of inflation with rank-2 antisymmetric tensor field, including here the tensor perturbations to metric. We perform a comprehensive analysis of the ba…
Covariant quantum corrections to a scalar field model inspired by nonminimal natural inflation
Sandeep Aashish, Sukanta Panda
We calculate the covariant one-loop quantum gravitational effective action for a scalar field model inspired by the recently proposed nonminimal natural inflation model. Our calcul…
One-Loop Effective Action for Nonminimal Natural Inflation Model
Sandeep Aashish, Sukanta Panda
Recent and upcoming experimental data as well as the possibility of rich phenomenology has spiked interest in studying the quantum gravitational effects in cosmology at low (inflat…
Quantum aspects of antisymmetric tensor field with spontaneous Lorentz violation
Sandeep Aashish, Sukanta Panda
We study the quantization of a simple model of antisymmetric tensor field with spontaneous Lorentz violation in curved spacetime. We evaluate the 1-loop corrections at first order…
Avoiding instabilities in antisymmetric tensor field driven inflation
Sandeep Aashish, Abhilash Padhy, Sukanta Panda
Models of inflation with antisymmetric tensor studied in the past are plagued with ghost instability even in an unperturbed FRW background. We show that it is possible to avoid gho…
Inflation with an antisymmetric tensor field
Sandeep Aashish, Abhilash Padhy, Sukanta Panda +1
We investigate the possibility of inflation with models of antisymmetric tensor field having minimal and nonminimal couplings to gravity. Although the minimal model does not suppor…
On the quantum equivalence of an antisymmetric tensor field with spontaneous Lorentz violation
Sandeep Aashish, Sukanta Panda
We present an explicit proof that a minimal model of rank-2 antisymmetric field with spontaneous Lorentz violation and a classically equivalent vector field model are also quantum…
Covariant Effective Action for Antisymmetric Tensor Field
Sandeep Aashish, Sukanta Panda
Covariant quantization of rank-2 antisymmetric fields is non-trivial due to additional symmetries of the gauge parameters. We present an intuitive way to deal with this additional…